I have been told that you can use the 1" filters, but you will need to change them every month. We run our fan 24-7 and after 6 months the filter needed to be changed. I also purchased MERV 13 which is a little higher rating than the MERV 11 that the service people supply.
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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