MAX BTU's

DennisDe · December 2003

What is the maxium BTU that can flow thru a 5" flue. I have been told that approx. 200btu can be handled by this flue size. Please advise max number

bigugh_4 · December 2003

Depends on height

a 6 foot height chimney will handle 116,000 btu's and a 50 foot height will handle 210,000 btu's ( Nat Fuel Gas Code!)
diffterent amounts in between. Btu's / hour input.

DennisDe · December 2003

MAX BTU'S

30FT ON CHIMNEY

Joannie · December 2003

Venting

Don't forget to consider the appliance you're dealing with, since there are different vent categories.

For instance, from the tables in the National Fuel Gas Code: A 5-inch b-vent, 30-feet high (no horizontal offset) can handle up to 220,000Btu/hr from a natural draft category 1 gas-fired appliance. But, that same 5-inch b-vent, 30-feet high (no horizontal offset) can handle up to 374,000Btu/hr from a fan-assisted category 1 gas-fired appliance.

If the 5-inch vent is being used for more than one appliance, the maximum changes.

If the appliance is not a category 1 appliance, then you need to consult the installation manual of the unit that you're venting.

Dale · December 2003

Depends

We need to know if the "lfue" you mention is the common vent ( what goes throught the roof) and what height and if your's is a fan assist or a nat draft.

Unknown · December 2003

Not an easy question to answer

there are a lot of things to consider, most of which the others who have posted already have addressed.

I have a manual available titled "Natural Draft Venting Systems and Chimneys" it is strictly covering Category I Natural Draft Systems. If you are interested e-mail me.

MAX BTU's

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