Filter King AF21x21x1A-M8 Merv 8 Air Filter 21x21x1

Product Description

The FILTER KING AF21x21x1A-M8 is a MERV 8 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 21x21x1 inch and an actual size of 21 x 21 x 0.75 inches, this filter captures a broad range of airborne particles including dust, pollen, mold spores, and pet dander. MERV 8 filtration is the standard efficiency level recommended for most forced-air systems where indoor air quality improvement is needed without restricting airflow. Licensed HVAC technicians and knowledgeable DIYers install this filter during routine maintenance as a direct drop-in replacement for standard 1-inch filter slots.

This filter fits standard 21x21x1 filter housings found in residential gas and electric forced-air furnaces, air handlers, and central air conditioning systems. It is sold in a quantity of 10, making it well suited for HVAC service companies stocking filters for scheduled maintenance routes or homeowners buying in bulk to maintain a consistent replacement schedule. The pleated media design provides a larger surface area than fiberglass panel filters, extending service life while maintaining adequate airflow across the system.

Key Features

• MERV 8 rated filtration captures dust, pollen, mold spores, and pet dander
• Pleated media construction increases surface area for longer service life
• Nominal size 21x21x1 inch fits standard 1-inch filter slots
• Actual dimensions 21 x 21 x 0.75 inches for proper housing fit
• Sold in a 10-pack for bulk stocking and maintenance routes

Compatibility

Designed as an OEM-style replacement for residential and light commercial forced-air furnaces, air handlers, and central air conditioning systems with a standard 21x21x1 inch filter slot.

Installation Notes

Power down the HVAC system at the thermostat or disconnect before replacing the filter. Confirm the airflow direction arrow on the filter frame aligns with the direction of airflow toward the blower. MERV 8 filters should be inspected monthly and replaced every 60 to 90 days depending on system run time and indoor conditions. Follow local codes and manufacturer guidelines for filter maintenance intervals.