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re: question about combustion air input on a high efficienct furnace.
10 nov 2005
wrote:
>yes put a air intake from outside will be a big help in heating cost by
>burning out side cold air and not the houise room air that is heated
>already...
if 100 cfm of 130 f air leaves the flue in either case, you can either
a) heat 100 cfm of house air from 30 to 70 f with about 4k btu/h from
the furnace, then heat it from 70 to 130 with 6k btu/h, total 10k btu/h, or
b) heat 100 cfm of 30 f outdoor air from 30 to 130 with 10k btu/h.
where is the energy savings?
nick
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