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FilterLock: Furnace Filter Slot Seal (12 Pack)


FilterLock: Furnace Filter Slot Seal (12 Pack)


FilterLock® is a patented two-piece system designed for use with 1-inch air filters that eliminates air leakage at the filter slot/door to improve indoor air quality (IAQ) and reduce energy consumption. Energy Star lists air leakage at the filter slot as one of four major issues with duct work in the home.  

If not properly sealed, harmful airborne contaminants can enter the heating, ventilating and air conditioning (HVAC) system through the filter slot/door and bypass the air filter. FilterLock® installs in seconds with no tools to eliminate unfiltered air from entering the system through the filter slot/door.  Since dirty air that leaks into the HVAC has to be conditioned, FilterLock®can also reduce energy consumption.  Built-in magnet fasteners hold FilterLock® securely in place, and it is re-usable indefinitely.

  • Saves energy and reduces energy bills
  • Improves indoor air quality
  • Blocks allergens and other contaminants, including deadly gases like carbon monoxide and radon from entering the HVAC system at the air filter slot.
  • Universal one size fits all
  • Reusable, easy on / easy off design
  • Magnetically attaches to the duct work
  • Each FilterLock is a two-piece design that works with any 1” filter up to 25” long
  • This item includes twelve (12) FilterLocks per box

AllergyZone offers a discount to wholesale customers purchasing FilterLock® in bulk. Discount is only available for FilterLock® 12-Packs. See chart below for quantity breaks and the corresponding discount code to use at checkout to receive discount.


(12-pack Box)


(Per 12-Pack Box)


(Per FilterLock)

Discount Code

(Enter at checkout)
1-2  $119.88 $9.99 -
3-8 $89.88 $7.49 FILTERLOCK25
 9-28 $77.92 $6.49



For orders of 29 or more FilterLock® 12-Packs, please contact for pricing. 


Discount only valid on FilterLock® 12-pack. Discount code must be taken at time of purchase. Discount shown in cart once discount code has been applied. Discount cannot be applied to previous purchases and cannot be added after an order is placed. If you have questions or need assistance, please contact customer service at 800-704-2112 or email Our representatives are available by phone Monday-Friday 8am-6pm EST.