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not really; I could easily see through it although there did seem to be a coating of dust on the top side.
Thanks; I'll try that and let you know.
Thanks very much! So far, so good. The air flow is much better and the icing on the inflow pipe is gone. I've switched on the a/c and will monitor the temp. Since the filter wasn't really clogged, if it happens again I'll suspect low freon. That sounds much cheaper than a new a/c unit.