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.

Bud

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

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

Bryan Pringle replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"I am getting a lot of "bad idea" push back on this.  I fully understand that…"
7 hours ago
Greg Mitchell commented on Larry Ralph Jr's blog post Top 7 Worst Crawl Space Repairs
"Spray Foam should be used in crawlspaces.   To learn about closed cell foam in crawlspaces…"
8 hours ago
Jerry Lawrence posted events
yesterday
Morgan M Audetat replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"Right you are. You have to ask: what will the cellulose contribute.  Here in Minneapolis we…"
yesterday
Morgan M Audetat replied to Tony Hicks's discussion Slab-on-grade Insulation
"All slabs float. We have been installing radiant floors on various slab constructions since the…"
yesterday
Tony Hicks replied to Tony Hicks's discussion Slab-on-grade Insulation
"2" XPS foam. I'd love an R-20. Having foam thick enough to get an R-20 would be…"
yesterday
Morgan M Audetat replied to Larry Schaffert's discussion How to correctly insulate exterior wall in a 1900 house?
"Sorry, I did missed the "siding nailed directly to the framing", my grandfather would…"
yesterday
Morgan M Audetat replied to Larry Schaffert's discussion How to correctly insulate exterior wall in a 1900 house?
"My own farm house is sided with 1/2" t&g pine boards and vinyl. We foamed then from the…"
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service