Woodburner flue size

[nicknoxx]

Hi all

Our chimney is lined with a 6" flue liner. Is is possible/advisable to try to connect a woodburner with a 7" flue to the liner, and if not, what problems are there likely to be?

thanks in advance

[andrew]

It's not recommended because the stove with the 7" flue probably needs that size to get the gases away, flue gas massflow is proportoinal to heat output.

The chimney (and its seal to the stove) maintains a depression in the stove so that any small leaks allow air to enter the stove and prevent noxious gases getting into the room. Effectively constricting the flue gases will reduce this depression (or draw).

OTOH a 6" pipe is the mandatory minimum for a woodburner even if the stove outlet is 5".

AJH

[dom]

Check part J of the building regs on heat producing appliances - ISTR this is regulated:

[Michael Chare]

Probably not! But you could ask the stove manufacturer.

Flue length could be a factor. I think long flues cause more draft which might be a compensating factor.