# Combustion and Makeup air 7-05

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## Combustion and Makeup air 7-05

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makeup air was installed in most older homes - the needed air was simply assumed to flow in ... Makeup air is now recognized as being equal- ly important as ...

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## Nội dung Text: Combustion and Makeup air 7-05

3. combustion gases can produce increasing the cooking surface must have a large exhaust amounts of carbon monoxide and other potential- capacity (600-cfm). A modest sized (250-cfm) hood ly dangerous gases. exhaust will be just as effective at removing odors and pollutants Wood fires are not the only cause of backdrafting. Although combustion air problems are more like- Protect your home with a carbon ly to occur when there is an open wood fire, they monoxide alarm are not limited to these situations. Clothes dryers, Every home should have at least one carbon gas stoves, gas or oil water heaters, and bathroom monoxide alarm with a digital display. Look on and kitchen or range exhaust fans all make con- the package for a product that meets the most siderable demands on the air supply. recent Underwriters Laboratories (UL) 2034 stan- Combustion air problems can occur in any home, dard, International Approval Services (IAS) 6-96 even older homes which were once assumed to standard or the Canadian Standards Association have enough air leaks to provide outside air for 6.19-01 standard. CO alarms are available at dis- combustion. Any home improvement or weather- count stores, hardware stores, and building supply ization measure (such as tightening up air leaks, stores. Many utility companies also sell them to adding insulation, or replacing windows) will their customers. Expect to pay between $35 and increase the potential for backdrafting. So, too,$60 for a UL listed alarm. does the recent consumer trend of installing The alarm should be capable of waking you up sophisticated cooking appliances with built-in while you sleep and should be easy to test and high-volume exhaust fans. These fan/exhaust sys- reset. Battery operated devices should be tested tems are powerful and remove more air from the weekly and the batteries replaced at least once a home than what can be supplied through leaks or year. Hard-wired devices should also be tested reg- passive openings. Because dedicated makeup air ularly, usually on a monthly basis. The unit should is needed for these devices, kitchen exhaust fans be placed near the sleeping areas of the house. with a design capacity greater than 300 cfm are For more information about home carbon monox- strongly discouraged. ide prevention, see the Minnesota Department of Bigger is not necessarily better when it comes to Health Web site (www.health.state.mn.us/ kitchen range exhaust systems. In order to be divs/eh/indoorair/co/preventco.html). effective “downdraft” exhaust fans mounted near Air moves into and out of a house because of differences in air pressure. Powerful exhaust fans can cause lower air pressure as illustrated by the house at left. In such a depressurized house, combus- tion appliances that rely on atmospheric pressure to exhaust their combustion gases are susceptible to backdrafting. The house at left is said to be pressurized which can lead to structural problems. The house in the middle is said to be balanced, which should be the design goal. Energy Information Center 3