I would like to vent my pellet stove which has a 3" flue and my gas floor furnace which has a 4" flue through my chimney which has an 8"x8" opening. Is it up to code to run two separate flue liners through a single chimney? Thank you.
Don't see why not because both still have seperate vents and flus.rosebud said:I would like to vent my pellet stove which has a 3" flue and my gas floor furnace which has a 4" flue through my chimney which has an 8"x8" opening. Is it up to code to run two separate flue liners through a single chimney? Thank you.
Daksy, I always read that as you can not use the area as it is to vent another appliance. But as two seperate liners it was allowed. Got that "version" from a code enforcer decades ago...But, I am an NFPA member. I guess I better give em a call Monday and hear it from the horses mouth. I have done installs that way in the past and now you all got me thinkin.DAKSY said:NO. From NFPA 211:
4.5.3 Space Surrounding Liner or Vent. The remaining space
surrounding a chimney liner, gas vent, special gas vent, or plastic
piping installed within a chimney flue shall not be used to
vent another appliance.
I believe that this can be interpreted both ways, in such a case though, where there is not solid understanding one must always default to the safer option. The OP is not suggesting that he vent into the air space surrounding a liner, but in fact contain gases in a separate liner shared within the same air space.DAKSY said:NO. From NFPA 211:
4.5.3 Space Surrounding Liner or Vent. The remaining space
surrounding a chimney liner, gas vent, special gas vent, or plastic
piping installed within a chimney flue shall not be used to
vent another appliance.
sure, logocally speaking, yes, but your question requires an inspector to actually stick his neck out and make a determination, then actually SIGN it, since it s a grey area code-wise.rosebud said:Thanks for all the imput. It's an old house that I'm working on, so I'll need to have an inspector okay the gas line before a meter can be re-installed. I'll mention my idea to him when I meet him. And I'll be sure to ask about how the two liners should be capped if he does accept my proposal. (Though I would think that a similar issue regarding CO2 running down the second flue would arise with two clay liners running next to each other down a larger chimney.)
rosebud
DAKSY said:NO. From NFPA 211:
4.5.3 Space Surrounding Liner or Vent. The remaining space
surrounding a chimney liner, gas vent, special gas vent, or plastic
piping installed within a chimney flue shall not be used to
vent another appliance.
I know this is a dead thread, but I'd like to add clarification on gas/oil appliances, which have a little more flexibility in this area:I dont think this has much bearing on the question of the OP, but my home has a Natural Gas Furnace, and a Natural Gas hot water heater, and both of them are vented into one single brick chimney. Two seperate gas appliances, venting into one chimney, and thats how the house was built. Every home I have seen that has furnace and hot water heater is always vented up into one chimney I've never seen two chimneys to vent two appliances.
I wouldnt think that using 2 seperate steel pipes in one brick liner would violate code, but I'm not an expert on this subject so it's best to ask your local code people.