Carbon Monoxide Poisoning and Detectors

Carbon monoxide (CO) is a colorless, odorless, poisonous gas that forms from incomplete combustion of fuels, such as natural or liquefied petroleum gas, oil, wood or coal.

 

Facts and Figures

• 480 U.S. residents died between 2001 and 2003 from non-fire-related carbon-monoxide poisoning.
• Most CO exposures occur during the winter months, especially in December (including 56 deaths, and 2,157 non-fatal exposures), and in January (including 69 deaths and 2,511 non-fatal exposures). The peak time of day for CO exposure is between 6 and 10 p.m.
• Many experts believe that CO poisoning statistics understate the problem. Because the symptoms of CO poisoning mimic a range of common health ailments, it is likely that a large number of mild to mid-level exposures are never identified, diagnosed, or accounted for in any way in carbon monoxide statistics.
• Out of all reported non-fire carbon-monoxide incidents, 89% or almost nine out of 10 of them take place in a home.

Physiology of Carbon Monoxide Poisoning

When CO is inhaled, it displaces the oxygen that would ordinarily bind with hemoglobin, a process the effectively suffocates the body. CO can poison slowly over a period of several hours, even in low concentrations. Sensitive organs, such as the brain, heart and lungs, suffer the most from a lack of oxygen.

High concentrations of carbon monoxide can kill in less than five minutes. At low concentrations, it will require a longer period of time to affect the body. Exceeding the EPA concentration of 9 parts per million (ppm) for more than eight hours may have adverse health affects. The limit of CO exposure for healthy workers, as prescribed by the U.S. Occupational Health and Safety Administration, is 50 ppm.

 

Potential Sources of Carbon Monoxide

Any fuel-burning appliances which are malfunctioning or improperly installed can be a source of CO, such as:

• furnaces;
• stoves and ovens;
• water heaters;
• dryers; 
• room and space heaters; 
• fireplaces and wood stoves;
• charcoal grills;
• automobiles;
• clogged chimneys or flues;
• space heaters;
• power tools that run on fuel;
• gas and charcoal grills;
• certain types of swimming pool heaters; and 
• boat engines.

 

 

 

 

PPM	% CO  in air	Health Effects in Healthy Adults	Source/Comments
0	0%	no effects; this is the normal level in a properly operating heating appliance
35	0.0035%	maximum allowable workplace exposure limit for an eight-hour work shift	The National Institute for Occupational Safety and Health (NIOSH)
50	0.005%	maximum allowable workplace exposure limit for an eight-hour work shift	OSHA
100	0.01%	slight headache, fatigue, shortness of breath,  errors in judgment
125	0.0125%		workplace alarm must sound (OSHA)
200	0.02%	headache, fatigue,  nausea, dizziness
400	0.04%	severe headache, fatigue, nausea, dizziness, confusion; can be life-threatening after three hours of exposure	evacuate area immediately
800	0.08%	convulsions, loss of consciousness; death within three hours	evacuate area immediately
12,000	1.2%	nearly instant death

 

 

CO Detector Placement

CO detectors can monitor exposure levels, but do not place them:

• directly above or beside fuel-burning appliances, as appliances may emit a small amount of carbon monoxide upon start-up;
• within 15 feet of heating and cooking appliances, or in or near very humid areas, such as bathrooms;
• within 5 feet of kitchen stoves and ovens, or near areas locations where household chemicals and bleach are stored (store such chemicals away from bathrooms and kitchens, whenever possible);
• in garages, kitchens, furnace rooms, or in any extremely dusty, dirty, humid, or greasy areas;
• in direct sunlight, or in areas subjected to temperature extremes. These include unconditioned crawlspaces, unfinished attics, un-insulated or poorly insulated ceilings, and porches;
• in turbulent air near ceiling fans, heat vents, air conditioners, fresh-air returns, or open windows. Blowing air may prevent carbon monoxide from reaching the CO sensors.

Do place CO detectors:

• within 10 feet of each bedroom door and near all sleeping areas, where it can wake sleepers. The Consumer Product Safety Commission (CPSC) and Underwriters Laboratories (UL) recommend that every home have at least one carbon monoxide detector for each floor of the home, and within hearing range of each sleeping area;
• on every floor of your home, including the basement (source:  International Association of Fire Chiefs/IAFC);
• near or over any attached garage. Carbon monoxide detectors are affected by excessive humidity and by close proximity to gas stoves (source:  City of New York);
• near, but not directly above, combustion appliances, such as furnaces, water heaters, and fireplaces, and in the garage (source:  UL); and
• on the ceiling in the same room as permanently installed fuel-burning appliances, and centrally located on every habitable level, and in every HVAC zone of the building (source:  National Fire Protection Association 720). This rule applies to commercial buildings.

In North America, some national, state and local municipalities require installation of CO detectors in new and existing homes, as well as commercial businesses, among them:  Illinois, Massachusetts, Minnesota, New Jersey, Vermont and New York City, and the Canadian province of Ontario. Installers are encouraged to check with their local municipality to determine what specific requirements have been enacted in their jurisdiction.

How can I prevent CO poisoning?

• Purchase and install carbon monoxide detectors with labels showing that they meet the requirements of the new UL standard 2034 or Comprehensive Safety Analysis 6.19 safety standards.
• Make sure appliances are installed and operated according to the manufacturer's instructions and local building codes. Have the heating system professionally inspected by an InterNACHI inspector and serviced annually to ensure proper operation. The inspector should also check chimneys and flues for blockages, corrosion, partial and complete disconnections, and loose connections.
• Never service fuel-burning appliances without the proper knowledge, skill and tools. Always refer to the owner's manual when performing minor adjustments and when servicing fuel-burning equipment.
• Never operate a portable generator or any other gasoline engine-powered tool either in or near an enclosed space, such as a garage, house or other building. Even with open doors and windows, these spaces can trap CO and allow it to quickly build to lethal levels.
• Never use portable fuel-burning camping equipment inside a home, garage, vehicle or tent unless it is specifically designed for use in an enclosed space and provides instructions for safe use in an enclosed area.
• Never burn charcoal inside a home, garage, vehicle or tent.
• Never leave a car running in an attached garage, even with the garage door open.
• Never use gas appliances, such as ranges, ovens or clothes dryers to heat your home.
• Never operate un-vented fuel-burning appliances in any room where people are sleeping.
• During home renovations, ensure that appliance vents and chimneys are not blocked by tarps or debris. Make sure appliances are in proper working order when renovations are complete.
• Do not place generators in the garage or close to the home. People lose power in their homes and get so excited about using their gas-powered generator that they don't pay attention to where it is placed. The owner's manual should explain how far the generator should be from the home.
• Clean the chimney. Open the hatch at the bottom of the chimney to remove the ashes.  Hire a chimney sweep annually.
• Check vents. Regularly inspect your home's external vents to ensure they are not obscured by debris, dirt or snow.

 

In summary, carbon monoxide is a dangerous poison that can be created by various household appliances. CO detectors must be placed strategically throughout the home or business in order to alert occupants of high levels of the gas.

To schedule your home inspection in San Antonio, TX, call 210-202-1974 or book online at www.vhillc.com

From https://www.nachi.org/carbon-monoxide.htm by Nick Gromicko 

Barbecue Safety

With tomorrow kicking off the summer, most of us will break out the BBQ sometime soon.  When you do, make sure you keep safety in mind.  And for tomorrow, take a moment to give thanks to the military men and women that gave their lives to allow us to live ours in freedom.

 

 

With barbecue season already here, homeowners should heed the following safety precautions in order to keep their families and property safe:

• Propane grills present an enormous fire hazard, as the Consumer Product Safety Commission (CPSC) is aware of more than 500 fires that result annually from their misuse or malfunction. The following precautions are recommended specifically when using propane grills:
  • Store propane tanks outdoors and never near the grill or any other heat source. In addition, never store or transport them in your car’s trunk.
  • Make sure to completely turn off the gas after you have finished, or when you are changing the tank. Even a small gas leak can cause a deadly explosion. 
  • Check for damage to a tank before refilling it, and only buy propane from reputable suppliers.
  • Never use a propane barbecue grill on a terrace, balcony or roof, as this is dangerous and illegal.
  • No more than two 20-pound propane tanks are allowed on the property of a one- or two-family home.
  • To inspect for a leak, spray a soapy solution over the connections and watch for bubbles. If you see evidence of a leak, reconnect the components and try again. If bubbles persist, replace the leaking parts before using the grill.
  • Make sure connections are secure before turning on the gas, especially if the grill hasn’t been used in months. The most dangerous time to use a propane grill is at the beginning of the barbecue season.
  • Ignite a propane grill with the lid open, not closed. Propane can accumulate beneath a closed lid and explode.
  • When finished, turn off the gas first, and then the controls. This way, residual gas in the pipe will be used up.

• Charcoal grills pose a serious poisoning threat due to the venting of carbon monoxide (CO). The CPSC estimates that 20 people die annually from accidentally ingesting CO from charcoal grills.  These grills can also be a potential fire hazard. Follow these precautions when using charcoal grills:
  • Never use a charcoal grill indoors, even if the area is ventilated. CO is colorless and odorless, and you will not know you are in danger until it is too late.
  • Use only barbecue starter fluid to start the grill, and don’t add the fluid to an open flame. It is possible for the flame to follow the fluid’s path back to the container as you're holding it.
  • Let the fluid soak into the coals for a minute before igniting them to allow explosive vapors to dissipate.
  • Charcoal grills are permitted on terraces and balconies only if there is at least 10 feet of clearance from the building, and a water source immediately nearby, such as a hose (or 4 gallons of water).
  • Be careful not to spill any fluid on yourself, and stand back when igniting the grill. Keep the charcoal lighter fluid container at a safe distance from the grill.
  • When cleaning the grill, dispose of the ashes in a metal container with a tight lid, and add water. Do not remove the ashes until they have fully cooled.
  • Fill the base of the grill with charcoal to a depth of no more than 2 inches.

• Electric grills are probably safer than propane and charcoal grills, but safety precautions need to be used with them as well. Follow these tips when using electric grills:
  • Do not use lighter fluid or any other combustible materials. 
  • When using an extension cord, make sure it is rated for the amperage required by the grill. The cord should be unplugged when not in use, and out of a busy foot path to prevent tripping.
  • As always, follow the manufacturer's instructions.

Safety Recommendations for General Grill Use

• Always make sure that the grill is used in a safe place, where kids and pets won't touch or bump into it. Keep in mind that the grill will still be hot after you finish cooking, and anyone coming into contact with it could be burned.
• If you use a grill lighter, make sure you don't leave it lying around where children can reach it. They will quickly learn how to use it.
• Never leave the grill unattended, as this is generally when accidents happen.
• Keep a fire extinguisher or garden hose nearby.
• Ensure that the grill is completely cooled before moving it or placing it back in storage.
• Ensure that the grill is only used on a flat surface that cannot burn, and well away from any shed, trees or shrubs.
• Clean out the grease and other debris in the grill periodically. Be sure to look for rust or other signs of deterioration.
• Don't wear loose clothing that might catch fire while you're cooking.
• Use long-handled barbecue tools and flame-resistant oven mitts.
• Keep alcoholic beverages away from the grill; they are flammable!

In summary, homeowners should exercise caution when using any kind of grill, as they can harm life and property in numerous ways. 

Remember, you can schedule your home inspection by calling 210-202-1974 or book online at www.vhillc.com

Adapted with permission from https://www.nachi.org/barbeque-safety.htm by Nick Gromicko

Attached Garage Fire Containment

To continue the information on garage fire safety, if the worst should happen, how can the fire be contained to the garage?

 

 

An attached garage is a garage that is physically attached to a house. Fires that begin in attached garages are more likely to spread to living areas than fires that originate in detached garages. For this reason, combined with the multitude of flammable materials commonly found in garages, attached garages should be adequately sealed from living areas. A properly sealed attached garage will ideally restrict the potential spread of fire long enough to allow the occupants time to escape the home or building.

Why are garages (both attached and detached) fire hazards?

• Oil or gasoline can drip from cars. These fluids may collect unnoticed and eventually ignite.
• Flammable liquids, such as gasoline, oil and paint, are commonly stored in garages. Some other examples are brake fluid, degreaser, motor oil, varnish, lighter fluid, and fluids containing solvents, such as paint thinner. These chemicals are flammable in their fluid form, and some may create explosive vapors.
• Heaters and boilers, which are frequently installed in garages, create sparks that can ignite fumes or fluids. Car batteries, too, will spark under certain conditions.
• Mechanical or electrical building projects are often undertaken in the garage. Fires can easily start while a careless occupant is welding near flammable materials. 

Doors

The 2006 edition of the International Residential Code (IRC) states the following concerning doors that separate garages from living areas:

R309.1 Opening Penetration

Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and the residence shall be equipped with solid wood doors not less than 1-3/8” (35 mm) in thickness, solid- or honeycomb-core steel doors not less than 1-3/8” (35 mm) thick, or 20-minute fire-rated doors.

In addition, Veteran Home Inspections can check for the following while inspecting doors that separate garages from living areas:

• While not required by the IRC, it is helpful if there is at least one step leading up to the door from the garage. Gasoline fumes and other explosive gases are heavier than air, and they will accumulate at ground level. Their entry beneath a door will be slowed by an elevation increase.
• Doors should have tight seals around their joints to prevent seepage of fumes into the living areas of the house. Carbon monoxide, with the same approximate density as air (and often warmer than surrounding air), will easily rise above the base of an elevated door and leak through unsealed joints.
• Doors should be self-closing. Many homeowners find these doors inconvenient, but they are safer than doors that can be left ajar. While this requirement is no longer listed in the IRC, it is still a valuable recommendation.
• If doors have windows, the glass should be fire-rated.
• Pet doors should not be installed in fire-rated doors. Pet doors will violate the integrity of a fire barrier. 

Walls and Ceilings

The 2006 edition of the IRC states the following concerning garage walls and ceilings:

          R309.2 Separation Required

The garage shall be separated from the residence and its attic area by not less than 1/2-inch (12.7 mm) gypsum board applied to the garage side. Garages beneath habitable rooms shall be separated from all habitable rooms above by not less than 5/8-inch (15.9 mm) Type X gypsum board or equivalent. Where the separation is a floor-ceiling assembly, the structure supporting the separation shall also be protected by not less than 1/2-inch (12.7 mm) gypsum board or equivalent. Garages located less than 3 feet (914 mm) from a dwelling unit on the same lot shall be protected with not less than 1/2–inch (12.7 mm) gypsum board applied to the interior side of exterior walls that are within this area. Openings in these walls shall be regulated by Section 309.1. This provision does not apply to garage walls that are perpendicular to the adjacent dwelling unit wall.

In addition, inspectors can check for the following while inspecting walls and ceilings:

• In garages that have access to the attic, a hatch cover made from an approved, fire-rated material should protect this access at all times. Missing or opened covers should be called out, as should covers made from flammable materials, such as thin plywood. Garage attic door must be constructed such that the 45-minute rating is maintained; any drywall edges on both the hatch and the surrounding area exposed to physical damage should be protected. The cover or door should be installed so that it is permanent (non-removable), with latching hardware to maintain it in a closed position. This could be accomplished by the use of spring-loaded hinges, a door closer, or hardware that will not allow it to be left in an open position when not in use. A single bolt-type or hook-and-eye hardware does not provide a positive closure, since these would allow the door to be left open. Likewise, drywall screws are fasteners--not hardware--so they cannot be used as the only means of keeping access doors closed.
• The living space should be separated from the garage by a firewall that extends from the floor to the roof. If the ceiling material is fire-rated, the firewall can terminate at the ceiling.
• Drywall joints shall be taped or sealed. Joints shall be fitted so that the gap is no more than 1/20-inch, with joints backed by either solid wood or another layer of drywall such that the joints are staggered. 

Ducts

The 2006 edition of the IRC states the following concerning ducts that penetrate garage walls and ceilings:

R309.1.1 Duct Penetration

Ducts in the garage and ducts penetrating the walls or ceilings separating the dwelling from the garage shall be constructed of a minimum No. 26-gauge (0.48 mm) steel sheet or other approved material, and shall have no openings in the garage.

Dryer exhaust ducts that penetrate garage walls are serious fire hazards. These ducts are generally made from plastic and will easily melt during a fire, creating a large breach in the firewall.

Floors

The 2006 edition of the IRC states the following concerning floors in garages:

          R309.3 Floor Surface

Garage floor surfaces shall be of approved, non-combustible material. The area of the floor used for parking of automobiles or other vehicles shall be sloped to facilitate the movement of liquids to a drain or toward the main vehicle entry doorway.

Inspectors should also check for the following:

• A curb should be present along the perimeter of the garage floor. This curb should be designed to prevent fluids from entering the living areas of the house. Curbs are often useful barriers for melted snow carried into the garage by automobiles, but curbs can also keep chemical spills contained in the garage.
• Water heaters should be elevated above the floor by at least 18 inches. A pilot light may ignite spilled fluid or floor-level flammable fumes if the water heater is placed at floor level.

Concerning items placed on the floor, inspectors should check for the following:

• All flammable liquids should be stored in clearly labeled, self-closing containers, and in small amounts. They should be stored away from heaters, appliances, pilot lights, and other sources of heat and flame.
• Propane tanks should never be stored indoors. If they catch fire, a serious explosion may result. Propane tanks are sturdy enough to be stored outdoors.
• The floor should be clear of clutter. Loose papers, matches, oily rags, and other flammable items are dangerous if they are strewn about the garage floor.

General safety tips that inspectors can pass onto their clients:

• Use light bulbs with the proper wattage.
• Do not overload electrical outlets.
• Tape down all cords and wires so that they are not twisted or accidentally yanked.

In summary, attached garages should be sealed off from the living space so that fire may be contained.

To schedule your home inspection, call Veteran Home Inspections at 210-202-1974 or schedule online at www.vhillc.com

Adapted with permission from https://www.nachi.org/attached-garage-fire-hazards.htm by Nick Gromicko and Kenton Shepard

Attached Garage Fire Hazards

The purpose of this article is twofold. First, at Veteran Home Inspections, we’d like you to take measures to keep your garage free from fire. Fortunately, there are ways this can be done, some of which are described below. Secondly, garage fires do happen, and we’d like you to make sure that a fire cannot not easily spread to the rest of your house. While you can perform many of the recommendations in this article yourself, it is a good idea to hire Veteran Home Inspections to make sure your home is safe from a garage fire.

Why do many garages pose a fire hazard?

• Where are you most likely to do any welding, or any work on your car? These activities require working with all sorts of flammable materials.
• Water heaters and boilers are usually stored in garages, and they can create sparks that may ignite fumes or fluids. Car batteries, too, will spark under certain conditions.
• Oil and gasoline can drip from cars. These fluids may collect unnoticed and eventually ignite, given the proper conditions.
• Flammable liquids, such as gasoline, motor oil and paint are commonly stored in garages. Some other examples are brake fluid, varnish, paint thinner and lighter fluid.

The following tips can help prevent garage fires and their spread:

• If the garage allows access to the attic, make sure a hatch covers this access.
• The walls and ceiling should be fire-rated. Unfortunately, it will be difficult for untrained homeowners to tell if their walls are Type X fire-rated gypsum. Our Certified Master Inspector can examine the walls and ceiling to make sure they are adequate fire barriers. 
• The floor should be clear of clutter. Loose papers, matches, oily rags, and other potentially  flammable items are extremely dangerous if they are strewn about the garage floor.
• Use light bulbs with the proper wattage, and do not overload electrical outlets.
• Tape down all cords and wires so they are not twisted or accidentally yanked.

If there is a door that connects the garage to the living area, consider the following:

• Do not install a pet door in the door! Flames can more easily spread into the living area through a pet door, especially if it’s made of plastic.
• Does the door have a window? We can inspect the window to tell if it's fire-rated.
• The door should be self-closing. While it may be inconvenient, especially while carrying groceries into the house from the car, doors should be self-closing. You never know when a fire will happen, and it would be unfortunate to accidentally leave the door open while a fire is starting in the garage.
• Check the joints and open spaces around the door. Are they tightly sealed? Any openings at all can allow dangerous fumes, such as carbon monoxide or gasoline vapor, to enter the living area. We inspector can recommend ways to seal the door so that fumes cannot enter the living area.

Concerning items placed on the floor, you should check for the following:

• Store your flammable liquids in clearly labeled, self-closing containers, and only in small amounts. Keep them away from heaters, appliances, pilot lights and other sources of heat or flame.
• Never store propane tanks indoors. If they catch fire, they can explode. Propane tanks are sturdy enough to be stored outdoors.
• Never bring charcoal grills (or ashes) inside the home or garage.  Even though you may think the coals are out, they can continue to smolder for days.  One of my neighbors almost lost his home when he threw coals in his garbage can 3 days after he grilled out.  The next morning the garbage can ignited and burned the side of his house.  Only an observant neighbor and a quick response from the San Antonio Fire Department saved his home.

In summary, there are plenty of things that you can do to prevent garage fires from spreading to the rest of the house, or to keep them from starting in the first place. However, it is highly recommended that you have your garage periodically examined by an inspector.

To schedule your home inspection, call Veteran Home Inspections at 210-202-1974 or schedule online at www.vhillc.com

Adapted with permission from https://www.nachi.org/garage-fires-client.htm by Nick Gromicko and Kenton Shepard

Carbon Monoxide Poisoning and Detectors

Carbon Monoxide detectors, or the lack thereof, is one of the most common defects I find during a home inspection!

Carbon monoxide (CO) is a colorless, odorless, poisonous gas that forms from incomplete combustion of fuels, such as natural or liquefied petroleum gas, oil, wood or coal.

 

Facts and Figures

• 480 U.S. residents died between 2001 and 2003 from non-fire-related carbon-monoxide poisoning.
• Most CO exposures occur during the winter months, especially in December (including 56 deaths, and 2,157 non-fatal exposures), and in January (including 69 deaths and 2,511 non-fatal exposures). The peak time of day for CO exposure is between 6 and 10 p.m.
• Many experts believe that CO poisoning statistics understate the problem. Because the symptoms of CO poisoning mimic a range of common health ailments, it is likely that a large number of mild to mid-level exposures are never identified, diagnosed, or accounted for in any way in carbon monoxide statistics.
• Out of all reported non-fire carbon-monoxide incidents, 89% or almost nine out of 10 of them take place in a home.

Physiology of Carbon Monoxide Poisoning

When CO is inhaled, it displaces the oxygen that would ordinarily bind with hemoglobin, a process the effectively suffocates the body. CO can poison slowly over a period of several hours, even in low concentrations. Sensitive organs, such as the brain, heart and lungs, suffer the most from a lack of oxygen.

High concentrations of carbon monoxide can kill in less than five minutes. At low concentrations, it will require a longer period of time to affect the body. Exceeding the EPA concentration of 9 parts per million (ppm) for more than eight hours may have adverse health affects. The limit of CO exposure for healthy workers, as prescribed by the U.S. Occupational Health and Safety Administration, is 50 ppm.

 

Potential Sources of Carbon Monoxide

Any fuel-burning appliances which are malfunctioning or improperly installed can be a source of CO, such as:

• furnaces;
• stoves and ovens;
• water heaters;
• dryers; 
• room and space heaters; 
• fireplaces and wood stoves;
• charcoal grills;
• automobiles;
• clogged chimneys or flues;
• space heaters;
• power tools that run on fuel;
• gas and charcoal grills;
• certain types of swimming pool heaters; and 
• boat engines.

 

 

 

 

PPM	% CO  in air	Health Effects in Healthy Adults	Source/Comments
0	0%	no effects; this is the normal level in a properly operating heating appliance
35	0.0035%	maximum allowable workplace exposure limit for an eight-hour work shift	The National Institute for Occupational Safety and Health (NIOSH)
50	0.005%	maximum allowable workplace exposure limit for an eight-hour work shift	OSHA
100	0.01%	slight headache, fatigue, shortness of breath,  errors in judgment
125	0.0125%		workplace alarm must sound (OSHA)
200	0.02%	headache, fatigue,  nausea, dizziness
400	0.04%	severe headache, fatigue, nausea, dizziness, confusion; can be life-threatening after three hours of exposure	evacuate area immediately
800	0.08%	convulsions, loss of consciousness; death within three hours	evacuate area immediately
12,000	1.2%	nearly instant death

 

 

CO Detector Placement

CO detectors can monitor exposure levels, but do not place them:

• directly above or beside fuel-burning appliances, as appliances may emit a small amount of carbon monoxide upon start-up;
• within 15 feet of heating and cooking appliances, or in or near very humid areas, such as bathrooms;
• within 5 feet of kitchen stoves and ovens, or near areas locations where household chemicals and bleach are stored (store such chemicals away from bathrooms and kitchens, whenever possible);
• in garages, kitchens, furnace rooms, or in any extremely dusty, dirty, humid, or greasy areas;
• in direct sunlight, or in areas subjected to temperature extremes. These include unconditioned crawlspaces, unfinished attics, un-insulated or poorly insulated ceilings, and porches;
• in turbulent air near ceiling fans, heat vents, air conditioners, fresh-air returns, or open windows. Blowing air may prevent carbon monoxide from reaching the CO sensors.

Do place CO detectors:

• within 10 feet of each bedroom door and near all sleeping areas, where it can wake sleepers. The Consumer Product Safety Commission (CPSC) and Underwriters Laboratories (UL) recommend that every home have at least one carbon monoxide detector for each floor of the home, and within hearing range of each sleeping area;
• on every floor of your home, including the basement (source:  International Association of Fire Chiefs/IAFC);
• near or over any attached garage. Carbon monoxide detectors are affected by excessive humidity and by close proximity to gas stoves (source:  City of New York);
• near, but not directly above, combustion appliances, such as furnaces, water heaters, and fireplaces, and in the garage (source:  UL); and
• on the ceiling in the same room as permanently installed fuel-burning appliances, and centrally located on every habitable level, and in every HVAC zone of the building (source:  National Fire Protection Association 720). This rule applies to commercial buildings.

In North America, some national, state and local municipalities require installation of CO detectors in new and existing homes, as well as commercial businesses, among them:  Illinois, Massachusetts, Minnesota, New Jersey, Vermont and New York City, and the Canadian province of Ontario. Installers are encouraged to check with their local municipality to determine what specific requirements have been enacted in their jurisdiction.

How can I prevent CO poisoning?

• Purchase and install carbon monoxide detectors with labels showing that they meet the requirements of the new UL standard 2034 or Comprehensive Safety Analysis 6.19 safety standards.
• Make sure appliances are installed and operated according to the manufacturer's instructions and local building codes. Have the heating system professionally inspected by an InterNACHI inspector and serviced annually to ensure proper operation. The inspector should also check chimneys and flues for blockages, corrosion, partial and complete disconnections, and loose connections.
• Never service fuel-burning appliances without the proper knowledge, skill and tools. Always refer to the owner's manual when performing minor adjustments and when servicing fuel-burning equipment.
• Never operate a portable generator or any other gasoline engine-powered tool either in or near an enclosed space, such as a garage, house or other building. Even with open doors and windows, these spaces can trap CO and allow it to quickly build to lethal levels.
• Never use portable fuel-burning camping equipment inside a home, garage, vehicle or tent unless it is specifically designed for use in an enclosed space and provides instructions for safe use in an enclosed area.
• Never burn charcoal inside a home, garage, vehicle or tent.
• Never leave a car running in an attached garage, even with the garage door open.
• Never use gas appliances, such as ranges, ovens or clothes dryers to heat your home.
• Never operate un-vented fuel-burning appliances in any room where people are sleeping.
• During home renovations, ensure that appliance vents and chimneys are not blocked by tarps or debris. Make sure appliances are in proper working order when renovations are complete.
• Do not place generators in the garage or close to the home. People lose power in their homes and get so excited about using their gas-powered generator that they don't pay attention to where it is placed. The owner's manual should explain how far the generator should be from the home.
• Clean the chimney. Open the hatch at the bottom of the chimney to remove the ashes.  Hire a chimney sweep annually.
• Check vents. Regularly inspect your home's external vents to ensure they are not obscured by debris, dirt or snow.

 

In summary, carbon monoxide is a dangerous poison that can be created by various household appliances. CO detectors must be placed strategically throughout the home or business in order to alert occupants of high levels of the gas.

For more information, contact us at www.vhillc.com

by Nick Gromicko

Used with permission from https://www.nachi.org/carbon-monoxide.htm