

Hero image 0 of Allergyzone FilterLock MERV 1 Furnace Filter Slot Seal Door Cover, 12x4.8x0.1, 0 of 4
Allergyzone FilterLock MERV 1 Furnace Filter Slot Seal Door Cover, 12x4.8x0.1
Key item features
- Air Leakage Prevention: Sealing air leakage/by-pass at the filter slot/door forces dirty air to travel through the filter instead of around it
- Reusable Design: Reusable overlapping 2-piece design works with any brand 1 in. air filter up to 25 in. L
- Magnetic Attachment: FilterLock has built-in magnets which hold it securely to the metal duct work
- Tool-Free Installation: Installs in seconds without the use of any tools
- Energy Efficient: Energy Star identified air leakage at the furnace and filter slot/door as 1 of 4 major problems with duct work
- DOE Recommendation: FilterLock satisfies the department of energy recommendation that the furnace filter slot be covered to avoid air leaks
Generated by AI
Specs
- Minimum efficiency reporting values (merv)0
- FeaturesReusable
- Microparticle performance rating99
- Thickness4.75 in
- MaterialPlastic
- Rec. useResidential
Current price is USD$12.99$12.99/count
Price when purchased online
- Free shipping
Free 30-day returns
How do you want your item?
Columbus, 43215
Arrives by Mon, Mar 2
|Sold and shipped by Filter-Monster|Pro Seller
4.596610169491526 stars out of 5, based on 295 seller reviews(4.6)295 seller reviews
Free 30-day returns
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About this item
Product details
Filter Lock
Allergyzone FilterLock MERV 1 Furnace Filter Slot Seal Door Cover, 12x4.8x0.1
- Seals air leakage and bypass at the filter slot and door, ensuring dirty air travels through the filter
- Reusable overlapping 2-piece design compatible with any brand 1 in. air filter up to 25 in. L
- Equipped with built-in magnets for secure attachment to metal ductwork
- Installs quickly in seconds without the need for tools
- Addresses major ductwork issues identified by Energy Star, including air leakage at the furnace and filter slot/door
- Meets Department of Energy recommendations to cover the furnace filter slot to prevent air leaks
info:
We aim to show you accurate product information. Manufacturers, suppliers and others provide what you see here, and we have not verified it. Â
Specifications
Minimum efficiency reporting values (merv)
0
Brand
Allergyzone
Features
Reusable
Microparticle performance rating
99
Warranty
Warranty information
ONE YEAR LIMITED WARRANTY
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
Please be aware that the warranty terms on items offered for sale by third party Marketplace sellers may differ from those displayed in this section (if any). To confirm warranty terms on an item offered for sale by a third party Marketplace seller, please use the 'Contact seller' feature on the third party Marketplace seller's information page and request the item's warranty terms prior to purchase.
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Customer ratings & reviews
How item rating is calculated
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Showing 1-3 of 32 reviews
Aug 30, 2025
anonymous
5 out of 5 stars review
Verified Purchase
Not sure if it will do much, but worth a try!
I think this will work for my purposes. Not sure if it will make that much difference, but since it was not expensive, worth a try.
Helpful?67AH10ZKECLD100776539
Mar 1, 2025
Tom
5 out of 5 stars review
Verified Purchase
Great furnace filter sealer
This product works as described. I was able to customize the two sheets to conform to my furnace. After completing the modifications, it tightly sealed the filter opening.
Helpful?67AH10ZKECLD100776539
Jan 2, 2026
Rao
5 out of 5 stars review
Verified Purchase
Very easy to install and should help reduce dust ingress into the air circulation system.
Helpful?67AH10ZKECLD100776539
