How to Pressurize Duct Work

Video Transcript

Hi! My name is Joshua Lindsey with CFM Building Solutions. On behalf of Expert Village, we are going to do a duct test in this house. All right this is the return air grill and we are going to hook this up here just like this. This is our hose to the duct blaster. This is a duct blaster. We showed this in our other test. This is what we are going to use to pressurize the duct work. Now jump over here, we are going to look at what Jacob is doing. The duct work right now is at negative 6.6 because of the air that the blower door is running through here. So Jacob is going to go ahead and run that up and what we are going to attempt to do is zero out this number right here. Okay we've got it on the positive side. That is what we are looking for. Just barely positive, just above 0 right there, as close as we can get it to 0 and sometimes it will bounce both ways. It doesn't matter if it drops a little bit under. So right now our leakage on this unit, this is a 2 unit house. Two difference AC's on here. We have 61 is the leakage on this one. How about our fan pressure? Fan pressure is 93 so we've got 93 over 61.

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