factorydirectfilters.com · www.factorydirectfilters.com
21x21x1 Aerostar Air Filter
MERV 8, 6
4.9 out of 5 · 388 ratings
$69.36 at factorydirectfilters.com right now, from Shopify.
Day 1 of 14 toward the first verdict
Sinclair, your free AI shopping companion
I'm checking this price every day. My first verdict comes at day 14, and I can email you the moment it's ready.
True Finds may earn a commission from stores, no cost to you. Sinclair's verdicts are always free and independent.
Price
Sinclair is checking. Day 1 of 14.
The store
factorydirectfilters.com is a True Finds partner store, with prices recorded every day.
Return policyProduct details
Photos and details from the store, through Shopify.
Reviews
Rated 4.9 out of 5 by 388 shoppers.
Sinclair
Email me when the verdict is ready.
About this product
Square 21x21x1 returns are uncommon enough that you've probably struggled to find this size at a hardware store. This Aerostar measures 20 7/8" x 20 7/8" x 3/4" actual, sized for a nominal 21x21x1 slot. Pleated synthetic media construction with an electrostatic charge built into the fibers. MERV 8 handles standard household dust and pollen. MERV 11 captures pet dander, smoke residue, and most common allergens. MERV 13 takes care of fine particulates including bacteria, virus-sized aerosols, and wildfire smoke. The pleats provide substantially more surface area than a flat fiberglass filter would offer at the same nominal size, which is what extends the service life to 60 to 90 days under typical residential conditions. The electrostatic charge improves capture of sub-micron particles - the size range where mechanical filtration runs out of options. Manufactured in the USA by Con-Air Industries, Orlando, Florida. Cardboard frame, reinforced for shape retention under blower suction. MERV 13 in this depth reaches its pressure-drop limit faster than lower grades and wants a change closer to every 30 to 60 days under typical load. If anyone in the household has asthma or chronic respiratory issues, MERV 13 is worth the more frequent change schedule for the improvement in indoor air quality.
- Pleated paper filter design: Enhances filtration efficiency by trapping airborne particles
- Disposable construction: Simplifies maintenance and replacement for users
- Compatible with most AC and furnace systems: Offers broad usability for home and office environments
- Removes dust, pollen, and bacteria: Supports healthier indoor air quality
- Available in multiple sizes: Ensures a precise fit for various vent intake requirements
- Filter Material
- Paper
- Filter Type
- Pleated
- Usage Type
- Disposable
- Compatible Systems
- Most home and office AC and furnace systems
- Available Sizes
- 12x12x1 in, 14x14x1 in, 14x20x1 in, 16x16x1 in, 16x20x1 in, 16x25x1 in, 20x20x1 in, 20x25x1 in, 20x30x1 in, 20x35x1 in, 25x25x1 in, 25x30x1 in, 30x30x1 in
- Color
- White, Blue, Green
Photos, details and ratings from factorydirectfilters.com, through Shopify.
How Sinclair checks, and what the verdicts mean
True Finds records factorydirectfilters.com's prices once a day, with permission through the store's affiliate network. This verdict comes from that record alone.
- GENUINE DEAL
- A real low. Good time to buy.
- INFLATED
- Not a real discount. The 'was' price is not what this really sells for.
- TYPICAL PRICE
- Normal price. Fine to buy if you need it.
- NOT ENOUGH DATA
- Too new to judge. Not enough price history yet.
Join True Finds, free
Sinclair verified real deals and early access to new features.
We will never sell your personal information.