j-d wrote:
Explorer1016 wrote:
We used a high 7000 cfm blower door system designed for energy audits of residential and commercial buildings.
I looked those up and they look like this:

I'd like to have my own tester. Sealtech Manufacturing Company makes the $4000 one used by good RV shops. Yep. Four Grand. What can I build for less that'll pressurize an RV?
I've heard that some have been able to do a pressure test with their Fantastic Vents set on IN and High. Our 31-ft has two. Maybe I'll go do a trial...
Yep JD, this isn't the exact model but this is what we used. It has so much volume we were a bit nervous we would blow out a skylight or suck one in. Never did put on hi speed. The one we used had a computerized barometer/atmospheric monitor attached to it and we controlled it with a wifi module and watched all of the pressures and controlled the fan speed and direction from an iphone while we were on the roof spraying soapy water. When we discovered a leak we didn't get any baby bubbles, we saw BIG 3" to 6" bubbles coming out of the leaking seal areas. It was very reassuring to be able to find any voids and know for a fact you would find the leak. Leaf blowers, box fans and fantastic fans just cannot produce enough volume of air to pressurize the inside of an RV to be competent.