Not all air filters are made equal. The higher the merv rating the more particulate it will catch. Also, the higher the merv rating, the less air flow due to increased pressure drop if filter size is consistent. To increase air flow and particulate capture rate, use a deep pleated filter in a higher merv rating. The deep pleated filter cabinets also prevent particulate bypass around the filter. #airfilter #hvacfilter #hvac #hvactips #hvactraining #hvacsystem #hvaclife #hvactechnician #hvacinstal