Filter for Ultramax II Furncae

Old 11-14-11, 12:49 PM
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Filter for Ultramax II Furncae

I have an Ultramax II gas furnace (more than 20 years old) and need to replace the air filter. In the stores I see a lot of different available filters with various MERV values. I have heard that some higher MERV values cannot be used on all furnaces as it would put too much strain on the fan motor. But I would like to install the highest MERV value that I can in order to improve the aqr quality in the house in the winter. Can anybody tell me what would be the highest MERV value filter that I can use on this furnace without compromising the fan motor ?
Old 11-14-11, 01:09 PM
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