When using the Duct Blaster I have found it necessary to seal the combustion air grilles on the furnace door and flue on an 80% afue gas furnace in order to obtain accurate leakage results. Any comments?

Views: 177

Reply to This

Replies to This Discussion

Far from my expertise, but there should be no connection between the combustion side and the conditioned air side.  The only thing I can think of would be duct side leakage inside the cabinet then accessing the combustion side through the air intake.  Of course there is a possibility of a cracked air exchanger, but not something you would run into on every unit, I would hope.  I'll be watching to see what the pros have to say.


Damien, if you do that, your results are inaccurate and of course the HVAC guy has an issue to find & fix

The duct test doesn't test just the ducts, but the whole air handling apparatus. The only exception is the version where the air handler hasn't been installed & then they are only allowed 4% leakage per the 2009 codes. With that said many municipalities don't accept that test & we simply won't perform it


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.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Bud Poll replied to John Carton's discussion Smoke Puffer stick
"Hi John, I recently purchased some used equipment and they included their smoke-pen.  I had…"
7 hours ago
Ryan Puckett is now a member of Home Energy Pros
16 hours ago
Mary Desilva posted a blog post

Why Do You Need Wet Basement Waterproofing Before It Is Too Late?

The thought of establishment repair is sufficient to make most property holders alarm, however how…See More
20 hours ago
John Carton posted a discussion

Smoke Puffer stick

Does anyone have any suggestions for an easy to use and rugged smoke puffer stick?Prefer not to…See More
Profile IconJesse, Daniel and John Carton joined Home Energy Pros
John Kaye commented on Diane Chojnowski's group Home Energy Pros on Twitter
"Happy Halloween Home Energy Pros tweet me  https://twitter.com/JohnKayeEnergy"
John Kaye joined Diane Chojnowski's group

Home Energy Pros on Twitter

We've created a twitter list of members of Home Energy Pros who tweet!See More
EnergyLogic Academy posted blog posts

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service