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: 195

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

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

George Matthews replied to George Matthews's discussion Shortridge 8400 Flowhood for A/C airflow testing in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Here are the pics of the flowhood and airdata manometer"
yesterday
Sarah Holloway posted a photo
yesterday
Joe Urycki added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

TEC blower door and UEI combustion analyzer for sale

For sale is one used TEC Minneapolis blower door system: Includes model 3 fan with rings A and B,…See More
yesterday
John Nicholas replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"The Nay side is well represented with the links already posted. I presented a neutral side, with…"
Friday
Ray Lehman replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"Hey John, Thanks for the information.  Very good empirical data. While I agree that running…"
Friday
John Nicholas replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"I have no links, just some anecdotal evidence. I had several Blower Door Tests done on my own home.…"
Friday
Chris Laumer-Giddens commented on Chris Laumer-Giddens's blog post Raising the BARrier in North Carolina Mountain Home, Air Tight Ceiling
"@Joe Nagan, We have found this technique to be WAY simpler and A LOT less labor than making a…"
Thursday
Judy Rachel replied to Blake Shurtz's discussion Testing spillage on induced draft furnace?
"I hope the attached picture is clear enough for you to see.  As the caption on the picture…"
Thursday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service