"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…"
In fact I do think the standard is suggesting making the building shell leakier. Obviously this would be a last resort, but it would be preferable to make a house leakier than to have a combustion appliance that is…"
"What to you think the standard means by 'other modifications to the building shell to bring the depressurization within acceptable limits.' It mentions makeup air earlier, so I do not think it is suggesting making the building shell…"
"This has never been taught in my class. We teach that the ideal remedy is to upgrade to a sealed combustion appliance to eliminate the interaction of house pressure on the appliances. If this is not a reasonable upgrade then there are other…"
"if it is being taught that sealing up a building and lowering the Blower Door cfm50 is a remedial action recommended in the work scope to solve worst-case depressurization issues
This is not at all what was taught in the class I took.
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