Full Equipment Protection: Standard MERV 1 glass filter shields furnace and central AC units. It delivers basic air interception without adding airflow resistance to your HVAC system, extending the service life of heating and cooling devices.
Space-Saving Nested Design: Adopts nested stacking construction for the 4-pack set. Filters can be tucked into each other when unused, cutting storage space occupation and easy to stock for year-round use.
Sturdy Integrated Chipboard Frame: The frame is molded from one whole piece of chipboard. No spliced seams to avoid corner separation under long-term air circulation, maintaining complete filter shape during service.
Durable Spun Glass Filter Medium: Filter layer uses continuous filament spun glass material, a mature standard filter medium applied for over 50 years. Stable structure won't deform under regular ventilation cycles.
Standard Monthly Replacement Guidance: Single filter supports up to 30 days of use. Replace monthly during high-load seasons to keep HVAC energy consumption low and guarantee consistent running performance.
Description
This standard grade furnace filter has safeguarded furnaces and central air conditioners globally for more than 50 years. It features continuous filament spun glass filter media and an integrated single-piece chipboard frame that stops corner separation. Replace monthly during heavy use to maximize equipment protection and energy efficiency. One pack contains four 16" X 25" X 1" filters for full-year maintenance.