Air Conditioning Contractors of America Discussions (2)

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Manual J & Attic calculations

Can anyone tell me how / if Manual J differentiates between attic floor insulation and insulated roof decks?

Started by Robert DV

3 Apr 11, 2013
Reply by Robert DV

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Has anyone done a combustion analysis on a relatively current furnace? Is a 90 truly a 90? Or are the numbers done in lab-like conditions t…

Started by randy tolowski

3 Apr 10, 2012
Reply by Christopher Morin

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