Filter King AF20x25x4-M8 Merv 8 Air Filter 20x25x4

Product Description

The FILTER KING AF20x25x4-M8 is a MERV 8 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 20x25x4 inches and an actual size of 19.5 x 24.5 x 3.75 inches, this filter fits standard 4-inch filter housings and media cabinets commonly found in forced-air furnace and air handler applications. MERV 8 filtration captures a broad range of airborne particles including dust, pollen, mold spores, and pet dander, making it a solid baseline choice for maintaining indoor air quality and protecting HVAC equipment. Sold in a pack of 10 units.

This filter is suited for residential forced-air heating and cooling systems, including gas furnaces, heat pumps, and air handlers that accommodate a 4-inch deep filter slot or media cabinet. It is appropriate for standard single-family and multi-family residential settings and light commercial applications where MERV 8 efficiency meets code or equipment requirements. HVAC technicians frequently install this filter type during preventive maintenance visits or system tune-ups. The pack-of-10 quantity supports service contractors stocking filters for multiple units or repeat service calls.

Key Features

• MERV 8 rated filtration captures dust, pollen, mold spores, and pet dander
• 4-inch depth fits standard media cabinets and deep-slot filter housings
• Nominal size 20x25x4 inches; actual size 19.5 x 24.5 x 3.75 inches for proper fit
• Pleated media design maximizes surface area for extended service life
• Pack of 10 units supports multi-unit service or stocking needs

Compatibility

Designed as an OEM-style replacement for residential and light commercial forced-air HVAC systems with a 4-inch deep filter slot or media cabinet sized for a 20x25x4 inch nominal filter.

Installation Notes

Installation should be performed by a qualified HVAC technician or knowledgeable DIYer. Power down the air handler or furnace at the disconnect or breaker before servicing the filter. Confirm the airflow direction arrow on the filter frame aligns with system airflow toward the blower. Check the actual cabinet dimensions against the filter actual size of 19.5 x 24.5 x 3.75 inches before installation to ensure proper seating and prevent bypass.