Size of combustion air vent for furnace


Old 07-10-02, 11:47 AM
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Size of combustion air vent for furnace

I have a residential furnace and hot water heat that I am going to be enclosing. I plan to make an opening to a crawl space (that is vented to the outside) for combustion air. How large should I make the combusion air opening?
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Old 07-10-02, 12:45 PM
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Need to know

BTU value of both units.PDF
Old 07-10-02, 01:13 PM
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I don't know right away and this would take some research. The water heater is a standard residental 40-50 gallon unit and the is furnace for a two BR house in northern CA.
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