https://airlucent.com/4-inch-vs-1-inch-furnace-filters/ Wed, 12 Feb 2025 18:21:30 +0000 hourly 1 https://wordpress.org/?v=6.7.3 https://airlucent.com/4-inch-vs-1-inch-furnace-filters/#comment-272 Sat, 29 Jan 2022 16:54:55 +0000 http://howtoair.com/?p=21#comment-272 The purpose of the filter is to protect the evaporator. HVAC guys tell me this all the time as they are replacing a fan motor that has prematurely failed. If you need a high merv filter for air purity because of breathing issues then buy an external air purifier device.
The higher merv ratings will impede the air so that the fan motor draws more current and will fail earlier. My 4 inch filters are minimum $80 and if I don’t have time to mail order the best deal on the internet then they cost $120 each. When the unit was installed they said the filter will last a year. But two months in and the airflow is so impeded I can’t get the house temp up to 65 on a cold day. So put in another $80-$120 filter. I don’t understand how someone can just use a 1 inch filter instead of 4 inch. The filter holder is made for a 4 inch. A one inch will just flop over. I would like to find something to modify my 4 inch opening to accommodate a 1 inch filter. But I find nothing. So my only choice is to disassemble the whole thing and do some metal work. I wish I had bought a heater with 1 inch filter. But apparently they don’t even make that anymore.

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