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: 1265

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

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Casey Gesell posted a video

Home Comfort Pays for Itself | Ideas Worth Sharing

http://www.myhomescience.com There are 88 million homes in the U.S. and Canada alone that burn twice as much fuel for heating and electricity for cooling tha...
2 hours ago
Profile IconRob Madden, Solar Home Broker, Alicia Hobbs, Rachel Scott and 2 more joined Home Energy Pros
3 hours ago
Don Fitchett posted a video

HVAC AC Compressors Training

This HVAC training sample is from the HVAC section of the Online Industrial Training Video Library (http://bin95.com/Industrial-Training-Videos/HVAC-Training...
3 hours ago
Sean Lintow Sr replied to Robert Cameron's discussion Air duct testing questions.
"#1 - outside "conditioned" space & really should not be allowed #2 - up to the AHJ if…"
5 hours ago
Susan E. Buchan posted a status
"EEBA's Conference in St. Louis last week was a great success! Presentations at http://www.eeba.org/conference/2014-presentations."
20 hours ago
Jan Green replied to George Kopf's discussion Real Estate Professionals need our support - but how?
"It helps for companies to understand what the public wants and to educate them so that realtors are…"
20 hours ago
Hal Skinner replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Hi Bret and thans for the offer.   I sent you a friend request so I can send you a…"
20 hours ago
Kevin Jordan shared George Kopf's discussion on Facebook
20 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service