Wow, 20 ACH50 is normal! I have gotten calls for parts of Flordia where they have to use Ring A for the first time and are confused. I thought that was bad.
We have had a distributer, Pro Clima, in New Zealand for a while…"
"Thanks Sean for a very will stated article. I agree with your assessment of the importance of compartmentalizing apartment units. If the only focus is on tightening the exterior enclosure and leakage to adjacent spaces is not addressed,…"
It sounds like you have a few things going on here. If the DG-700 is not going to be used for extended periods of time, it is good practice to take the batteries out.
We recommend that the DG-700 be recalibrated every 3…"
"Sorry for chiming in so late. Sean’s comment early on in the discussion was the closest to the point. 160 CFM is off the calibration charts on the high end. Your Duct Blaster® Ring 3 may be able to top out at 160 CFM with…"
"if the duct leakage is relatively low, 200 cfm or less, the pressure in the duct system will be quite uniform and either location will give consistent results. If the duct leakage is high, over 500 cfm, we recommend that you do two…"
"I would like to share some of the lessons learned by the Minneapolis Sound Insulation Program when it weatherized over 8000 homes near the MSP airport and installed continuously operating exhaust only ventilation in almost all of them. We are…"
"This article (http://www.ncbi.nlm.nih.gov/pubmed/17587417) shows that the measured cabin pressure in an airplane changes by 5000 Pa during flight. This will certainly cause discomfort but is unlikely to cause damage. I wouldn't be…"
"David, you could use the Exhaust Fan Flow Meter to measure air flows above 10 cfm through the recessed light, but you would need to pressurize the house to 50 Pa. For flows below 10 cfm, you would need to make the hole in the Exhaust Fan Flow…"
HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
ACI (Affordable Comfort, Inc.) is a nonprofit organization providing cutting-edge information, education and best practices in the area of residential building construction known as home performance and weatherization. Through national and regional educational and networking events, ACI provides innovative building science knowledge presented by renowned industry experts focused on advancing residential energy efficiency nationwide. It is our…See More
"Common practice in the Minneapolis area for the past 20 years has been to drill a 2” hole in a closet on an outside wall and snap a plastic plug into the hole after verifying the insulation level. This would be done for any home built…"
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A presentation by Greg Labbé in April 2014 on retrofitting vintage home for energy efficiency. He talked about basic building science, brick houses, movement of heat energy and moisture in and out of the house, air barrier and water barrier, house…