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  • 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
  • Two piece design is 4-3/4" wide and works with any 1" filter up to 25" long
Installation: Simply remove FilterLock from the package and cover the filter slot, letting the two pieces overlap in the center of the slot opening. Built-in magnets hold FilterLock securely in place.

For replacement instructions, click here