Day and Night air handler filter

Will a MERV 13 20x25x5.25 Restrict Airflow in My Older Day and Night AC?

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Diagram illustrating airflow restriction when upgrading an older Day and Night AC to a MERV 13 filter, an important visual comparison for homeowners asking 'Does a MERV 8 20x25x5 Air Filter Remove Wildfire Smoke Odors?' and considering higher-efficiency options.

Last Tuesday a homeowner in Madera held a 20x25x5.25 MERV 13 air filter up to his phone camera and asked me if he was about to break his air conditioner. His Day and Night air handler went in during the 2011 remodel. The filter had been sitting in his garage for three days while he … Read more