indoor air quality meters

Mann+Hummel 16x20x1 MERV 8 Pleated HVAC AC Furnace Air Filters. 6 Pack. (Exact Size: 15.5 x 19.5 x 0.75 Inches)

Filter-Monster Filter Bundle Compatible with AirDoctor AD3000 and AD3500

NaturalAire 20 in. W X 30 in. H X 1 in. D Natural Fiber 4 MERV Air Filter 1 pk (Case of 6)

Vornado True HEPA Filter for Air Purifier: Replacement Filter, MERV 12, Captures Dust & Smoke, Compatible with Vornado Models

BestAir A10W Whole House Humidifier Replacement White Water Pad For Aprilaire and Honeywell Models: Humidifier Filter Replacement, Wick Vapor Pads

AAF Flanders 20 in. W X 16 in. H X 1 in. D Fiberglass 1 MERV Air Filter (Pack of 24)

Winix Genuine 116130 Air Purifier Replacement Filter H True HEPA for 5500-2: Captures Allergens, Washable Carbon Filter

Halls 12pk Mentho-Lemon Scented Vapor Aromatherapy Pads

Filterbuy 20x25x5 Air Filter (4-Pack), Pleated MERV 8 Dust Defense HVAC AC Furnace Air Filters for Amana, Coleman, Goodman, Maytag, York, & More

HY1800 Official Replacement Filter, H13 True HEPA 3-Stage Air Purifier Filter with Activated Carbon, 2 Pack.

Vornado Carbon Pre-Filter for Air Purifier

Filterbuy 22x24x5 Air Filter (2-Pack), Pleated MERV 11 Allergen Defense Replacement HVAC AC Furnace Filters for Amana, Goodman, & Five Seasons

NaturalAire 21-1/2 in. W X 23-1/2 in. H X 1 in. D Synthetic 8 MERV Pleated Air Filter (Pack of 12)

Filterbuy 27x27x1 Air Filter (12-Pack), Pleated MERV 13 Health Defense Replacement HVAC AC Furnace Filters (Actual Size: 26.50 x 26.50 x 0.75)

Halls 12pk Mentho-Cherry Scented Vapor Aromatherapy Pads

Filtrete 20"x25"x1" 6pk Allergens Bacteria & Viruses MPR 1500 MERV 12 Electrostatic Pleated HVAC Furnace Air Filter

Simply 17x20x1 Air Filter, Merv 8, MPR 600, 6 Pack, Furnace Air Filter for HVAC (Actual Size: 16.75"x19.75"x0.75") DUST, Pet, & Allergy Control

Filterbuy 24x24x1 Air Filter (2-Pack), Pleated MERV 8 Dust Defense Replacement HVAC AC Furnace Filters (Actual Size: 23.38 x 23.38 x 0.75)