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: 185

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

Ed Minch commented on Tom White's video
Thumbnail

Measured Home Performance: Assessment with a Infrared Camera

"I find it best to scan one time before the Blower Door is used to check for insulation and…"
2 hours ago
Profile IconLarry Kinney and teplie_poly joined Home Energy Pros
5 hours ago
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Okay, a couple of things. The 1.0 kW per square meter reference is only under the most ideal lab…"
16 hours ago
Hans Joachim Preiss replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan, Let me attempt to compare apples with apples: My solar thermal system is located in…"
17 hours ago
Dan Antonioli replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Hi Hans, I don't know where you're located but where I am a 2.5 kw pv system costs closer…"
20 hours ago
Hans Joachim Preiss replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"I use the combination of solar PV and heatpump water heaters in the vast majority of net-zero…"
22 hours ago
Amber Vignieri posted a blog post
yesterday
William Zwack added a discussion to the group Job Board
Thumbnail

Residental Energy Specialist: Washington, DC (or possibly telework)

Position Summary: CSRA Incorporated is searching for a Sr. Residential Building Energy Efficiency…See More
yesterday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service