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: 2034

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

R Higgins replied to Energy Wise Solutions's discussion No Utility Homes, Are we ready to start building Homes that are not connected to traditional utilities ?
"First off, check the laws in your area.  Drought prone areas often prohibit on site collection…"
7 hours ago
R Higgins commented on Tom White's video
Thumbnail

Building Science Insights -- To Vent or Not to Vent

"Great lecture, kept thinking, but what about existing buildings.  Too little room at eaves for…"
7 hours ago
Luis Imery added a discussion to the group Job Board
Thumbnail

Hiring: Construction Manager with High Performance Custom Home Experience

POSITION DESCRIPTIONJob Title: Construction ManagerDepartment: Construction –…See More
yesterday
Profile IconLuis Imery and Quinn Korzeniecki joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
Colin Genge posted an event

Retrotec is attending the NEBB Testing and Balancing (Tab) Certified Professional Review Seminar in Chicago, IL at Hilton Chicago O’Hare Airport

June 6, 2016 at 8am to June 8, 2016 at 5pm
Building owners and tenants are concerned that the environmental performance of buildings must be…See More
yesterday
Colin Genge updated an event
Thumbnail

Retrotec is exhibiting at the NFPA Conference & Expo-Booth 1355 at Mandalay Bay Convention Center

June 13, 2016 at 8am to June 16, 2016 at 5pm
NFPA's Conference & Expo is widely regarded as the most comprehensive industry event for…See More
yesterday
Tom White posted a video

Hayward Healthy Home Principles and Products

Bill Hayward discusses the principles that were used to build the first Hayward Healthy Home and how the products were evaluated for toxicity before they wer...
yesterday
Tom White's video was featured

Building Science Insights -- To Vent or Not to Vent

Building Science Presentation with Dr. Joseph Lstiburek.
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service