MERV ratings for air filter regulators range from 1 to 20, where 1 is minimum filtration and 20 is maximum efficiency and maximum filtration. Ratings are determined by ANSI/ASHRAE Standard 52.2. Air filters remove particulate matter (PM) and other irritants from the air.

    Higher-rated MERV filters also require the HVAC system to use more energy to pull the air. The Construction Specifications for Indoor Air PLUS provide a good starting point. For air intake, the Environmental Protection Agency (EPA) recommends a MERV 13 or higher filter to reduce outdoor particulate matter entering the home. For central forced ventilation HVAC systems, Indoor airPLUS requires a MERV 8 or higher filter and recommends a MERV 13 or higher filter. MERV-rated air filters offer multiple benefits across the entire range. On the higher efficiency end, the MERV 11 and later versions filter out smaller particles ranging in diameter from 0.3 – 1.0 microns. Irritants such as tobacco smoke or smoke fall into this category. If filters in the home are below MERV 11, these potential allergens are more likely to be more prevalent in the home and may affect customer comfort by triggering allergy attacks or triggering asthma occupants. MERV Class 8+ filters can filter particles from 1.0 to 3.0 microns (eg lead dust, car exhaust). MERV 8 and below filters are capable of filtering out larger particles such as 3.0 to 10.0 microns in diameter (eg, hair spray, mold spores).

    Ningbo Sinppa Air Tools Factory is a Chinese manufacturer of pneumatic tools, selling Pu Air Hose, Air Filter Regulator, and other tools.