Filter King AF17.5x21x1A-M8 Merv 8 Air Filter 17.5x21x1

Product Description

The FILTER KING AF17.5x21x1A-M8 is a MERV 8 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 17.5 x 21 x 1 inch and an actual size of 17.5 x 21 x 0.75 inches, this filter fits standard 1-inch filter slots and delivers mechanical filtration rated at MERV 8. At this rating, the filter captures a broad range of common airborne particles including dust, pollen, mold spores, and pet dander, making it a practical choice for routine system maintenance. HVAC technicians and service contractors install this filter as part of scheduled preventive maintenance on forced-air heating and cooling systems.

This filter is suited for residential forced-air systems and light commercial air handlers that accept a 1-inch filter in the 17.5 x 21 inch nominal slot. It is appropriate for systems where moderate particulate capture is the primary goal without significantly increasing static pressure drop across the air handler. Typical applications include standard split systems, packaged units, and fan coil units serviced on regular maintenance cycles. The pleated media construction provides increased surface area compared to flat fiberglass filters, supporting longer service intervals under normal operating conditions.

Key Features

• MERV 8 rated pleated media captures dust, pollen, mold spores, and pet dander
• Nominal size 17.5 x 21 x 1 inch fits standard 1-inch filter tracks and cabinets
• Actual size 17.5 x 21 x 0.75 inches for proper fit in nominal 1-inch slots
• Pleated construction provides greater filter media surface area versus flat media
• Available in a quantity of 10 per order, suitable for stocking service vehicles or facilities

Compatibility

Designed as a replacement pleated air filter for residential and light commercial forced-air HVAC systems accepting a 1-inch nominal filter in a 17.5 x 21 inch opening.

Installation Notes

Air filters in forced-air systems should be replaced by a qualified HVAC technician or knowledgeable building maintenance personnel. Always set the system thermostat to the off position and confirm the air handler has stopped before removing the old filter. Install with the airflow arrow on the filter frame pointing toward the blower, away from the return air side. Follow local codes and equipment manufacturer guidelines for filter replacement intervals, typically every 30 to 90 days depending on system load and air quality conditions.