Was an old washable hog hair filter that originally came with my Carrier heat pump system for 10 years. I decided to replace the old pig hair with a matching disposable paper filter. I called carrier so they can offer a MERV rating so as not to put too much stress on my system/fan motor etc. Carrier HAD NO IDEA and said to call my local HVAC specialists. My local friend (like me) thought MERV 8 should be fine and not harm my system. The filters arrived today and I did an airflow test through my advanced thermostat and found that the MERV 8 was filtering the system too much (see photo). I can throw away my old washable stubble AND not worry about putting undue stress on my HVAC system. Hope that helps! Good filters! Fits exactly as I thought. Beware of higher MERV ratings though!
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