1995 Tioga Montara

j-d wrote:
Pressure testing for leaks in an RV is done professionally with a SealTech machine like this The section between the two silver bands is a collapsible tube and the square top clamps to a roof vent.
It takes a high volume low pressure air source. You don't want to blow the RV apart at the seams, but it also leaks lots of air out of places that aren't water intrusion sites. RV is pressurized then the person doing the test sprays soapy water on all the RV's seams, penetrations, etc. Bubbles are a leak source.
DIY approaches use leaf blowers, job site ventilators, furnace blowers, etc. Design should include a manometer to verify pressure is adequate but not excessive. I want to build my own tester.
FYI - Residential Heat/Vent/Aircon (HVAC) shops have a "Blower Door" that contains a fan and expands to fit, well, a residential door, and do a pressure test on a house. It can be used in an RV if adapted to the curved door frame of most RV's so if you know somebody in that business they might be able to help you.