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MRCOOL Cabinet Sizes Explained: A, B, C & D Cabinet Widths for Air Handlers, Coils & Furnaces

Not sure whether you need a MRCOOL A, B, C, or D cabinet? This guide explains the four common HVAC cabinet widths—14.5, 17.5, 21, and 24.5 inches—and how they relate to MRCOOL central ducted air handlers, evaporator coils, gas furnaces, and dual fuel systems. Learn how to measure your existing equipment, avoid compatibility mistakes, and choose the correct cabinet size for your installation.