When I installed my new Panasonic Fan/Light/Nightlight I did not want it to
get clogged up like you describe. I also did not want to take out the mot
or every few months to clean it. I bought a sheet of 1" thick reusable fur
nace filter material and cut pieces to fit in my grill. That worked out pe
rfectly. Now I just remove the filters, wash them with soap and water and
put them back in.
I installed two bathroom Panasonic fans (Fan only) for a customer several m
onths ago who had a cat. The fans that I removed were caked with dander.
I tried to use the same filter material that I used on my Fan/Light/Nightli
ght but the space was too tight. I suggested to the homeowner that he try
looking around for some other type of filter material that was thinner. Ma
ybe even a screen would work.
One thing about installing a filter or screen is that it will affect the fa
n performance. Bath fans are not designed to accommodate a filter. Havin
g something in there will affect the air flow. However, based on my own ex
perience I have not noticed that the fan is under-performing. It is import
ant to keep the fan and filter clean. I should note that when I installed
my new fan, I relocated it from the builder's position over the toilet. I
installed mine over the shower which has made a tremendous difference in th
e amount of steam removed. No more foggy mirrors.
I think that it might be more effective to brush the inside of your bath fa
n air duct instead of just vacuuming it. I have a brush kit that I use for
my dryer vent. It works for bath fan air ducts as well.
I wrote a 19 page booklet entitled "Almost Everything You Need To Know To R
epair A Bathroom Exhaust Fan In Your Home". It is free to visitors of my w
eb site. In it I list every bath fan manufacturer's contact information fo
r obtaining replacement parts.
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