Aerostar 20x20x1 MERV 11 - 4 Count - Pleated HVAC, Furnace & Air Conditioner Filters - Removes Dust, Cold & Flu Germs, Lint, Mold, Pet Dander, Allergy-Causing Pollen, Smog & Smoke JOISTOON Large size is about 15

Large size is about 15

This respirator is certified by NIOSH with P100/OV/CL/SD/HC respirator approvals

the opening on the lid can protect your wires form damage by sharp edges

ANSI compliant when worn in the forward and reverse donning positions

scratch and abrasion

Aerostar 20x20x1 MERV 11 - 4 Count - Pleated HVAC, Furnace & Air Conditioner Filters - Removes Dust, Cold & Flu Germs, Lint, Mold, Pet Dander, Allergy-Causing Pollen, Smog & Smoke JOISTOON Large size is about 15Brand: Aerostar Color: MERV 11 Features: Nominal size: 20x20x1; Actual size: 19 3 4"x19 3 4"x3 4"; This MERV 11 filter is comparable with MPR 1000 1200 & FPR 7 Designed to filter microscopic particles such as lint, dust mites, spores, pollen, pet dander, fine dust, and smoke Simple to install and a cost effective step towards a healthier home environment. For best results, change your filters every 60 to 90 days but increase frequency to 30 days