Buying guide for home air filters in furnaces – HEPA, SMART or Regular?

Finding the right high-efficiency home air filter for furnaces & ventilation systems is essential for keeping indoor air clean, healthy & protecting us from allergens, animal dander, pollen, mold spores & maybe worse.… What are home air filters used for?  
Air filters on air handling units such as furnaces, HRV and ER…

HEPA filters & SMART Air Filters catch airborne dust, pollen, allergens, virus
Source: EcoHome

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