One thing I find important. I installed a 5" x 20 x 25 filter on my last system and the 5" x20x20 that was already installed here in TV.
1. I stick with MERV 8 filters, with higher (11 & 13 MERV filters) can cause static air pressure/flow issues in your system.
2. You really need to buy or match your air filter size based on your systems. The size listed isn't the actual size and filter holders all seem to be slightly differnt sizes. My is a Ultravation 90-CF-052 Media holder, so I look that up on Amazon for an exact fit.
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