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Description
This is a standard grade furnace filter of the same type that has been protecting furnaces and central air conditioners around the world for over 50 years. The filtering medium is continuous filament spun glass. The frame is made with one continuous piece of chipboard to guard against corner separation. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use.

Features:
  • spun glass; lasts up to 30 days
  • maximum air flow
  • alleviates strain on equipment
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Specs
Size:
18" x 18" x 1"
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