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I used Merv 8 on top of my minisplit. That seems to work pretty well. I did measure a slight drop of airflow with an anemometer but it does not seem to impact cooling or heating performance or change the amperage drawn when running with and without the filters. I had to lay the filters on top because I do not have the room that Dave and Jay Bates have over their minisplits.
BTW, I bought my filters from filterbuy.com. They have just about any size you might need so if your design calls for a specific size filter other than the ones you typically find locally, they probably have it. I think that they will even make custom sizes for you. The more filters you buy, the better the price and if you buy enough of them, they have free shipping too. I also bought a year supply of filters for the house while I was at it so it was not hard to reach the free shipping threshold. I use MERV 11 filters for my house units.
BTW, I bought my filters from filterbuy.com. They have just about any size you might need so if your design calls for a specific size filter other than the ones you typically find locally, they probably have it. I think that they will even make custom sizes for you. The more filters you buy, the better the price and if you buy enough of them, they have free shipping too. I also bought a year supply of filters for the house while I was at it so it was not hard to reach the free shipping threshold. I use MERV 11 filters for my house units.
--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.
