Filterbuy 21x21x5 MERV 11 Air Filter (4-Pack) 20.63x20.63x4.38
Pleated HVAC air filters with MERV 11 media for allergen defense. Improves system efficiency and protects indoor air quality. Customers note good value, easy installation, and fit, with some concerns about size and durability
Highlights
- MERV 11 allergen defense
- 4-pack for replacement cycles
- Actual size considerations noted by customers
Pros
- MERV 11 filtration for allergens
- Includes 4-pack
- Pleated synthetic media
- Designed for furnace, air conditioner, or heat pump
Cons
- Mixed reviews on actual size fit
- Some reports of flimsy construction
Best For
Features
- 21x21x5 size compatible furnace air filters for standard replacement
- MERV 11 synthetic media captures dust and allergens with 95% efficiency
- Electrostatically charged media with 8 pleats per foot lasts longer than fiberglass
- Made in the USA with recyclable beverage board frames and dual wire backing
- Compatible with Rheem/Ruud Protech models PD540018 and 540012
