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

Latest Activity

Malcolm McKelvie replied to Alan Gindt's discussion Minneapolis Blower Door System for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"yes I would pay the delivery fee!"
Saturday
Alan Gindt replied to Alan Gindt's discussion Minneapolis Blower Door System for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Malcolm, If you want to pay delivery from USA we can talk. Otherwise no thanks."
Saturday
Malcolm McKelvie replied to Alan Gindt's discussion Minneapolis Blower Door System for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"How old is it? I assume it is in good working order? I'm interested in it but the price needs…"
Saturday
William H Nickerson replied to Kim Tanner's discussion Fantastic innovation
"So that's where you use those True Flow plates....."
Friday
Colin Genge updated an event
Thumbnail

Passive House Testing Webinar with Kevin Brennan of the Passive House Academy at Online

September 29, 2015 from 1pm to 2pm
Tests needed to qualify as a passive houseWhy we’re seeing an increase in PH buildingsBest…See More
Friday
Colin Genge updated an event
Thumbnail

DM32 Smart Gauge 101 Webinar at Online

September 22, 2015 from 1pm to 2pm
Webinar Learning Objectives:Gauge settings and operationCalculate results in the gaugeUpdate the…See More
Friday
Colin Genge updated an event
Thumbnail

Blower Door 101 Webinar at Online

September 15, 2015 from 1pm to 2pm
See how easy it is to do your first test. Learn tips to perform your first duct test in only twenty…See More
Friday
Colin Genge updated an event
Thumbnail

Zone Pressure Diagnostics (ZPD) with Bill Eckman of NME$A Webinar at Online

September 10, 2015 from 1pm to 2pm
Benefits and limitations of Zonal Pressure Diagnostics (ZPD).Best practices for accurate…See More
Friday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service