BPI does not consider fireplaces or wood stoves to be combustion appliances.  Yet they produce CO and can backdraft fumes into a house. 

 

Obviously you can't perform a spillage, CO, or draft test on a fireplace, and you wouldn't want to run a blower door or duct blaster soon after having a fire in a wood stove or fireplace. 

 

But what do you think would be a good worst case depressurization limit for a fireplace or wood stove?  -5 pascals, same as a natural drafting furnace or boiler?

 

Anyone ever do a spillage, CO, or draft test on a wood stove?

 

What have you done or recommended if a fireplace or wood stove backdrafts under worst case or natural conditions?

 

 

 

Tags: Backdrafting, CAZ, depressurization

Views: 742

Reply to This

Replies to This Discussion

I think a WCD of -5pa is pretty reasonable, but like Adam I would love to see some data!
The guys at the energy conservatory did some work on this a number of years ago. As I recall, 6 Pascals is enough to backdraft an operational fireplace. BPI does consider fireplaces and woodstoves CAZs.
Couple of things, though. 1. The worst part of a fireplace fire is at the end of the burn, when the chimney is cooling, and combustion is incomplete. Those romantic embers can be deadly. If a fireplace or woodstove backdrafts at the beginning, people usually don't like the smoke and open a window, which may or may not help.
2. I think you have to consider a fireplace or woodstove as a serious participant in sucking the air out of the house for worst case depressurization. I use the blower door to draw 250 to 300 cfm out of the house along with all the other exhaust appliances. No, I don't start a fire and see what happens!
Wow that is interesting, running the blower door at 250 to 300 cfm to simulate what the real worst case would be like with a fire in the fireplace or wood stove.

BPI may consider fireplaces and wood stoves to be CAZs, but they don't have any depressurization limits or action levels to implement for them. So as far as BPI goes, you could have a house with a worst case depressurization of -10 pascals and a fireplace or wood stove, and it would pass with flying colors with no requirements or recommendations to fix anything.

RSS

Forum Discussions

How would you insulate this roof?

Started by David Butler in General Forum. Last reply by David Butler yesterday. 15 Replies

Psychrometric Chart Training

Started by John Krochmalny in Training. Last reply by Mahendra Shah yesterday. 1 Reply

Dirty solar panels

Started by Evan Mills in General Forum. Last reply by Stacie Bagnasco on Monday. 1 Reply

Latest Activity

tedkidd replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"Yeah. Gas water…"
yesterday
Eric Kjelshus replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"With super cheap natural gas prices now, still worth going all electric?  Tankless needs a lot…"
yesterday
Stuart Langley liked Chris Clay's photo
yesterday
David Butler replied to David Butler's discussion How would you insulate this roof?
"Stuart, I wasn't considering the copula windows... yes, those would indeed need to be…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"Well, @David Butler, you have seen the property more accurately than I have, but my impression of…"
yesterday
David Butler replied to David Butler's discussion How would you insulate this roof?
"@ Stuart,I don't think there's any concern about impact of 4" build-up on elevation…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"So this building has a few issues with air leaks and air leaks have so much to do with discomfort…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"John Hatfield has the right idea here for a new roof deck. Polyiso boards always need a good stout…"
yesterday

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service