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I posted this over in the “Energy: Heating, Insulating, & Venting a House” forum and there seems to be very little interest. I’m hoping it’s because no one is taking the time to go to the other forums, not because no one really cares 😉 Anyway, here’s the thread so far.
Jerry
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Jerry - 06:52am Feb 20, 2000 EST
With reference to these posts, < Obsolete Link > Whole House Humidifiers: What's the real story?
< Obsolete Link > **** VENTING / NO VENT = Consensus ??? ***** and others recently, I don't understand why the CAZ (combustion appliance zone) should be in the building envelope. I know this question has come up before (maybe I'm just thick), but I don't think it's been answered or even fully discussed. It seems to me that it would be so much safer for the occupants if the CAZ were completely isolated from the living space. Of course you have to provide outside combustion air, but you have to do that anyway. What is the downside; what am I missing?
Jerry
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Bill_Conner - 04:50pm Feb 21, 2000 EST (2.)
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Jerry, I think it had to do with the unreliability of an intake duct - blocked by whatever or a damper not opening - and causing more problems rather than fewer. But I agree - I'd like more reasons as to why not since these seem they could be overcome.
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Rich Beckman - 02:18am Feb 22, 2000 EST (3.)
Home Solutions, Professional Handy-Man Services, east central Indiana
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I thought that some newer furnaces had the CAZ isolated within the furnace with the combustion gases going out a flue and combustion air coming in a vent. Is this my fevered imagination run amok?
Rich Beckman
*This is really what happens in lots of duplexes and other multi-family structures. For things like heat plants properly done I can't imagine there should be a problem. The difficulty is doing it correctly, including making sure the homeowner keeps it separate. In mobile homes and other manufactured housing this is fairly common. For other appliances like gas ranges, dryers, etc I think it is well nigh impossible.