AprilAire 313 Replacement Filter for AprilAire Whole House Air Purifiers - MERV 13 Healthy Home Allergy 20x20x4 Air

Fits perfect and always does and a great job for my hvac system Read more

These are great filters that really cut down on the dust and pollen in the home. Read more

Exactly as listed. Slides into the receptacle perfectly and removes even the tiniest dust from the air. My family hasn't had any issues with indoor allergens. Read more

I buy these every few months for my home. Very good product. Will continue to buy. Read more

These are whole home filters. They appear to work well and I can usually get around 4 months of use out of them, of course that may vary depending on environment. Overall good though I think a little pricey for what they are. Read more

I trust this brand and with several indoor pets we need all the help we can get cleaning the air. Price is still high but lower than some sellers. Read more

By comparison to the typical filter found at the big box home store, the surface area of this is enormous. But it comes at a price easily as much as 3, and perhaps, depending on the vendor, 9, times more expensive for the opening size. But this filter has at least 4 times the depth of the others, and every line you see in the illustration is a sharp-angled turn leading to a reverse turn 4 inches to the other side. The impact is to massively increase the surface area of the filter media - 23.3 square feet! Which leads to the recommended change interval of 6-8 months, and up to a year. As small as our home is (600 square feet, with a 200 square foot loft), we might well get an entire year from one of these. But, in the end, what matters is its filtration quality. I'd never before seen a filter media as dense in surface area, or medium area (it looks and feels like very fluffy felt), and I'm confident that it can capture a huge load before being restricted in flow. These trap common allergy triggers as they pass through the MERV 13 filter including dust, pollen, mold spores, bacteria, pet dander, and dust mites. (A Minimum Efficiency Reporting Value (MERV) rating of 13 indicates that an air filter can trap at least 50% of particles that are 0.3–1.0 microns in size, and at least 85% of particles that are 1.0 microns or larger. When the particle size increases to 3–10 microns, a MERV 13 filter can trap at least 90% of them.) In the end, it all fits into a 4"square shipping box; putting the old one in after removing your replacement will conveniently and compactly capture all that airborne grunge it so effectively removed. Well done... Read more

Expensive but super easy to install. And hopefully does what it claims. Can’t tell if it’s quieter than if I used the paper filters at the air intake inside the house, but the new AC is super quiet even at full speed. Read more