Iain Walker and Max Sherman developed the DeltaQ test in 2002 to provide a more accurate measurement of duct leakage. The test is relatively easy to perform, and it uses less time, less equipment, and less labor than the existing tests.

As they write in the September/October, 2002 issue of Home Energy, "For many years, building scientists have known that information on duct leakage can be obtained using blower door tests that include the duct system. However, most efforts have focused on using a single test pressure and some assumptions about converting measured air leakage flow to actual leakage at operating conditions.The DeltaQ test takes a different approach. It measures air leakage flows for the ducts and the building envelope over a large range of pressures, just as normal blower door testing does.

We call it DeltaQ because “Q” is the common term used for air flow, and “delta” is the common term used for differences. The test is based on measuring the change in flow through duct leaks as the pressure across those leaks is changed by turning the HVAC system air handler on and off." Read on...

Tags: Delta, Iain, Max, Q, Sherman, Walker, duct, homeenergy.org, leakage, test

Views: 5

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

Tom White's 3 videos were featured
30 minutes ago
Jim Gunshinan's blog post was featured
30 minutes ago
Sharon Block's 3 events were featured
31 minutes ago
Tom White posted videos
39 minutes ago
Linda Wigington replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Kaushal I just spent more than an hour on a detailed response and lost when I decided to check the…"
1 hour ago
Sharon Block posted events
1 hour ago
Alice La Pierre replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Hello Kaushal, I understand your predicament, as I also have a house in Berkeley that I wanted to…"
1 hour ago
Kaushal Bharath Raju replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Thanks Graham for that. It was also my belief that the cost difference between remodeling and doing…"
2 hours ago
Kaushal Bharath Raju replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Thanks Jim! I'll be sure to check that out."
2 hours ago
Jim Gunshinan replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Kaushal, My wife and I are doing something similar to our house in Walnut Creek (1951, 1,200 sf)…"
3 hours ago
Jim Gunshinan posted a blog post
3 hours ago
Linda Wigington commented on David Eggleton's group 1000 Home Challenge
"Great discussion in the general forum. Consider chiming…"
3 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service