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busdriver
Journeyman
Joined: 16 Mar 2009
Posts: 3497
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 Posted: Wed Jan 13, 2010 8:01 am Post subject: |
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| Professor wrote: | | You should also know that the same property that allows CO to rise on warm air, allows it to fall with cold air and if your are working in a cold area where are there combustion burning appliances nearby, the low areas can quickly fill with CO. Those in industry and construction should be particularly aware of this when working in permit required confined spaces. |
What are your thoughts about the safety of these ventless gas fireplaces? They sit in an enclosure on the unit's deck and open into the living room of the unit. |
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Professor
Apprentice
Joined: 03 Dec 2008
Posts: 358
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| Posted: Wed Jan 13, 2010 5:00 pm Post subject: |
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Personally I don't like them. Modern non-vented heaters are equipped with an oxygen depletion sensor, but they are not equipped with anything to detect CO or other combustion gases and if you have a strong enough negative pressure source in the home dangerous fumes can be drawn into the living space. Negative pressure sources include smoke eaters, bath and kitchen exhaust fans, attic fans, clothes dryers, and forced draft furnaces.
When there are small children or the elderly present, most indoor air quality professionals recommend that a non-vented heater be used for no more than 2 hours per day and that they never be used in an air-tight home, trailer or mobile home.
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busdriver
Journeyman
Joined: 16 Mar 2009
Posts: 3497
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| Posted: Sat Feb 20, 2010 3:03 pm Post subject: |
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| Professor wrote: | Personally I don't like them. Modern non-vented heaters are equipped with an oxygen depletion sensor, but they are not equipped with anything to detect CO or other combustion gases and if you have a strong enough negative pressure source in the home dangerous fumes can be drawn into the living space. Negative pressure sources include smoke eaters, bath and kitchen exhaust fans, attic fans, clothes dryers, and forced draft furnaces.
When there are small children or the elderly present, most indoor air quality professionals recommend that a non-vented heater be used for no more than 2 hours per day and that they never be used in an air-tight home, trailer or mobile home. |
Negative pressure sources include smoke eaters, bath and kitchen exhaust fans, attic fans, clothes dryers, and forced draft furnaces.
I know you mean they must operating ( exhausting indoor air) to be able to create negative pressure. |
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