Measure filter size at point of filter brackets. Should be 1 inch thick. 16 x 25 is common. The accordion or pleated filters are good for cooling not for heat. I call them furnace killers. Much less air flow. Heat exchangers over heat and fail prematurely.
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Measure filter size at point of filter brackets. Should be 1 inch thick. 16 x 25 is common. The accordion or pleated filters are good for cooling not for heat. I call them furnace killers. Much less air flow. Heat exchangers over heat and fail prematurely.