MAX BTU's

DennisDe

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

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

MAX BTU'S

30FT ON CHIMNEY

Joannie

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

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

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.