Aerostar 21x21x1 MERV 11 filter
MERV 11 pleated HVAC filter (nominal 21x21x1, actual 20.875x20.875x0.75) designed to trap dust, pollen, pet dander, mold and smoke particles. Customers note quality, perfect fit, and good value for money
Highlights
- mERV 11 filtration
- pleated design for dust capture
- fits 21x21x1 filter slots
Pros
- good fit for 21x21x1 frames
- high filtration efficiency
- designed to capture dust, pollen, mold spores
- valued for quality and performance
Cons
- actual size slightly smaller than nominal
- no price or availability details
- no warranty information provided
Best For
Features
- Nominal size 21x21x1; actual 20.875x20.875x0.75 inches; MERV 11 filter
- Filters microscopic particles including lint, dust mites, spores, pollen, pet dander, fine dust, and smoke
- Simple to install; designed for furnaces and air conditioners as a cost-effective improvement to home air quality
- Recommend changing every 60–90 days; increase frequency to 30 days during peak summer and winter months
