There is a method called Modified Blower Door Subtraction that can be used to approximate duct leakage to the outside, but not total duct leakage. That method also requires measuring the pressure in the duct and modifying your readings…"
"The Weatherization Assistance Program Standard Work Specifications vary state to state. I suggest contacting your state office for clarification. I would want to know how they define ventilation systems. Does this include exhaust fans,…"
"I agree that checking for combustion spillage is more important that checking for draft. It is possible to have high draft pressures and spillage at the same time. For example, if a 75,000 BTU water heater is vented with a 3"…"
"Hi Evan, there is a research project in the works that is being headed up by Ecotope and Center for Energy and Environment with some technical support from The Energy Conservatory. They are looking at methods for code compliance air-tightness…"
"When testing draft, using the straight probe will be a close approximation of static pressure because the velocity is so low. You should have the end of the probe close to the center of the vent and at a 90 degree angle to the pipe. "
"I agree with previous comments that the primary sources of moisture are the un-vented space heater and the slab. But there could be additional sources. It is not clear if this space is primarily a wood shop or a garage. A wood shop…"
Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment you have to sell, trade or wish to purchase.Please post the equipment age, serial numbers, condition, warranties and asking price.See More
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…"
Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!
Don't forget to upload your profile photo. And, add your location on our Member Map!