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).



Anybody dealt with this before? Thanks.