I want to replace the bathroom fan and its housing which is noisy and ineffectual with a Fan-tastic Fan. The housing is well bedded in a hard coating. I am wondering if anyone has suggestions for removing the coatings and housing with out damaging the roof. I thought about an angle grinder with a wire brush rather than the grinder. I have tried scrapers and the coating is so hard that it barely scratches the surface. I have to get enough of the coating off so I can see where the rivets are.

The bathroom fan is not one to be left on for long periods of time. Your buddy's coach (Yale's) has a thermostatically-controlled Fantastic Fan in the center that works as a whole-house fan. It also has a new combination light/fan in the bathroom. Despite being new, it is noisy because it is a small propeller fan running at high RPM and pulling air through wire window screen. I replaced it because the plastic housing was cracked and leaked.
Too many CFM going out the bathroom ceiling can pull sewage fumes.

quote:

Originally posted by Mogan David:
The bathroom fan is not one to be left on for long periods of time.

Yup. I put a variable timer on ours. It has two speeds. Slow for a long time for a shower and a shave, and fast for a short time for fresh air as needed.

I used a heat gun to warm up the area to soften the calking. CAREFULLY. After it was warm I could use a flat putty knife to remove what I needed to get at the retaining rivets and screws.

I like the idea of a timer. I should have thought of a heat gun, I've worked on yachts for many years and I must keep in mind this is pretty much the same only with wheels.