Filterbuy 21x21x5 MERV 11 Air Filter (3-Pack) – Pet & Allergy Defense
Air filters for furnace/AC/heat pump with MERV 11 media that captures dust and allergens. Customers note good quality and value, with mixed fit reports
Highlights
- MERV 11 performance
- 3-pack
- Actual size close to 21x21
Pros
- MERV 11 synthetic media for allergen protection
- Electrostatic pleated design
- Includes 3-pack for replacement needs
- Actual size close to 21x21x5
Cons
- Fit may not match all units
- Some reports of size mismatch
Best For
Features
- WHOLE HOUSE REPLACEMENT 21x21x5 air filters for your furnace
- air conditioner
- or heat pump enhance HVAC system efficiency and support a healthy lifestyle (actual size 20. 63" x 20. 63" x 4. 38")
- MERV 11 PERFORMANCE Protect your home or business from allergens
- pets
- and more with MERV 11 synthetic media (comparable with MPR 1200 & FPR 7) that captures 95% of dust without restricting air flow
- LASTING FILTRATION Electrostatically charged media (made in the USA) with 8 pleats per foot traps more microscopic particles and lasts 3x longer than fiberglass models (replace every 90 days for best results)
- SUPERIOR CONSTRUCTION Easy installation beverage board (recyclable) frames with dual wire backing outperform basic cardboard designs by improving durability and resisting extreme temperatures
