Wood burning fireplace on 13 year old home in Wisconsin. Exterior wall with cantilevered chase. During blower door test I found noticeable air leakage to the inside from above the metal firebox. Would naturally suspect air leakage from the top and back of the chase. However, there are 2 air intakes on the chase - one is for outside air to the firebox as expected. The other one seems to be just an open vent to the chase. Outside air was freely entering the 2nd vent and into the home while building was depressurized.

Anyone know what this vent is for, and does it need to be there?

I don't have a picture, but the two exterior vents were side by side. Sorry too that I don't know the make of the fireplace. They have no complaints with the fireplace area, but I'd like to know.

 

Thanks,

John

Views: 2009

Replies to This Discussion

I imagine is pretty hard to tell much without the brand and its installation instructions to know what was required for that particulare fireplace model; not all fireplaces are built nor installed the same. It'll be interested to know how well sealed and insulated were the cantilever and chase before installing the firebox.

Does this home has a second direct vent fireplace between the 2 side windows? 

That is correct Armando.

I'm sure we won't be doing anything intrusive with regard to the chase, but I'd like to know if we could seal off the vent, as that was certainly a pathway for outside air to enter into the home.

Yes. Its correct.

John:  The chase is unlikely to have been treated as "conditioned" space by the builder.  If it is not air sealed it performs basically like a small garage with a fireplace instead of a car in it. 

Current code requires an air barrier in the fireplace chase, but I have never succeeded in retrofitting a chase like the one shown in your picture.

RSS

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Rick Causo posted a video

Swing Green GFX Drain Water Heat Recovery - GreenFoX

PowerHouseTV aired Sept 5 & 6, 2015. Segment 2 of the show highlights Swing Green, Inc. and the 4th generation of Drain Water Heat Recovery system, the Green...
51 minutes ago
Matt Thornberry replied to Kim Tanner's discussion Game of Homes
"Thanks Kim! Game of Homes is an exciting new way to earn professional development credits for BPI…"
2 hours ago
Tom White posted a video

Enhabit: the non-profit that helps homes work better

Hear from homeowners Sonia, Amy, Roberta and Ty of Portland, Oregon, and Andy of Beaverton, Oregon, about their experiences with Enhabit. Enhabit is a non-pr...
2 hours ago
Daniel Beauchemin replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan Antonioli, You can use a ThermoDrain, drain water heat recovery to preheat your water and…"
3 hours ago
Steve Leombruno replied to Tim Kendzia's discussion Cooling effect from solar panels
"I have been told t"
4 hours ago
Rich Manning replied to Diane Chojnowski's discussion Poll: Where do you go for information on home performance?
"My favorite is Building Science Corp. Its not only comprehensive, its free!"
4 hours ago
Tom Barrett replied to Tim Kendzia's discussion Cooling effect from solar panels
"Any type of shading will help greatly. One of the biggest, if not the biggest, factor for high…"
4 hours ago
Rich Manning replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"80% seems a little  high to me for the solar system. Typically one would size the system to…"
4 hours ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service