20x25x1 MERV 1 Fiberglass Furnace Air Filter 4-Pack | Nested Continuous Spun Glass HVAC AC Filter, UL Class 2

Key features

• Efficient Storage: Features a nested construction, allowing for compact and efficient storage of multiple filters.
• Lasting Performance: Each filter provides reliable air filtration for up to 30 days, maintaining consistent air quality.
• Durable Construction: Built with a heavy one-piece chipboard frame and self-retaining spun glass media to prevent corner separation.
• Safety Certified: Meets rigorous safety standards as a UL Class 2 certified air filter.
• Quality Material: Constructed with continuous filament spun glass for effective and reliable filtration.

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. For peak equipment protection and energy efficiency, these filters should be changed monthly in periods of high use.

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