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: 2143

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

Amber Vignieri posted a blog post
6 hours ago
Evan Mills posted a blog post

Looking Back and Looking Forward: Home Energy Pros at 5 and 5000

Over the past five years, the Home Energy Pros social network has grown from a twinkle in our eyes…See More
7 hours ago
tedkidd replied to Diane Chojnowski's discussion Poll: How confident do you feel about the future of home performance?
"Thank you for sharing this trend! Full disclosure, I did NOT ask Bob to post that! If you have 2…"
7 hours ago
Bob Blanchette replied to Diane Chojnowski's discussion Poll: How confident do you feel about the future of home performance?
"I see fixed monthly grid charges continuing to increase while cost per therm/kwh/gallon remain…"
8 hours ago
Quinn Korzeniecki posted a discussion

Vent Cap Systems and SENSIT Technologies Products Added to BPI Product List

The Building Performance Institute, Inc. (BPI) has recognized four new products in its …See More
10 hours ago
Simon joined Diane Chojnowski's group
Thumbnail

Online Training

Online training coursesIf you provide ongoing online training for home performance or…See More
yesterday
Simon added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Wanted - Blower and door frame kit for Minneapolis system

Hi everyone,I'm new to this line of work and have bought some equipment (Minneapolis blower door…See More
yesterday
Simon replied to Steve Mann's discussion TEC Blower Door Frame in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Hi, I'm interested, but could you send to UK?,I'd pay shipping of course. My email is :-…"
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service