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Looking for help with intake air requirements


hausdok
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Hi All,

Got a sticky one here. Brand new construction with a Cat IV furnace.

By my reckoning, the garage the furnace and the gas water heater are installed in has a volume of roughly 5,184 cubic feet. Using the 50 cf per 1000 Btu rule of thumb, the furnace and water heater together require not less than 6,000 cubic feet, so it's short.

However, the manual for this furnace specifies that it be installed IAW the fuel gas table requirements and specifies Table ANZI-Z2223.1/NFPA-54.

Has anyone got a copy of this table. If so, what's the requirement going to be for an 80,000 Btu/Hr Cat 1V appliance?

Thanks,

ONE TEAM - ONE FIGHT!!!

Mike

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Originally posted by hausdok

. . . By my reckoning, the garage the furnace and the gas water heater are installed in has a volume of roughly 5,184 cubic feet. Using the 50 cf per 1000 Btu rule of thumb, the furnace and water heater together require not less than 6,000 cubic feet, so it's short. . .

In a garage, I'd call that plenty. Is the garage hermetically sealed or something?

- Jim Katen, Oregon

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I'm having vague recolection of reading somewhere that the induced draft burners have a lower air requirement. Something along the lines of 50cf/3000btu's and then it was further scewed dependend on weather the construction was considered air tight or not. I'm a little foggy in the head right now (after midnight). I'll try and get you something more than "vague" in the morning.

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