Posted by ks willie on November 22, 2010 at 06:55:12 from (205.214.245.176):
My project is installing a duel fuel propane/wood furnace for shop heat. It uses 6 foot logs that will light off with propane. My idea is to get the wood started with the propane and then just turn the gas valve off to save on fuel. I intend to put the furnace in the lean-to that is attached to the shop. I have a question about the return air. How much return air does a furnace need? The return air plenum opening is 20” by 18”. Do I need to pull the return air form the shop or is it ok to pull its air from the lean-to? If it can use air from the lean-to other than screen to keep the pack rat out what would I need? Would some type of damper door be a good idea? The return air plenum does use filters on ether side of the blower motor and I guess it would be a good idea to retain them. Shop is 24X30.Thank you for any advice.
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