Vent Screen Removal

I'm almost embarrassed to ask this but I have three of these small DC exhaust fans on the boat with what appears to be a 4" diameter cover screen. Problem is the screens are slowly clogging up and seem to be installed rather tight. I'm afraid that if I try too hard to remove them I might risk damaging the vent body or cause it to come loose from the caulking seal which is applied between the neck and the wall (see photo).

http://i137.photobucket.com/albums/q...anscreen-1.jpg

Anybody dealt with this before? Thanks.

Mine just twist and come off ... friction fit holds them in.

On mine, I had to pull the hose and there were three screws into the plywood from the inside. The 3rd one was junk and out came the #3 channel locks! Junk them and get a nice perko vent. ws

I forgot to add that the screen and the bezel are one! ws

FYI I just bought one at Sam's Marine for $50, I can't believe the price. Mine was badly rusted and I just removed by twisting it. Karl

Don't take it off to clean it. Just turn the fan on and go over it with a stiff brush. The bristles will poke most if the crud through and the fan will suck it out.

I do the same with similar screens, use a stiff brush.