Filter King AF20x21x1A-M13 Merv 13 Air Filter 20x21x1

Product Description

The FILTER KING AF20x21x1A-M13 is a MERV 13 rated pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 20x21x1 inch and an actual size of 20 x 21 x 0.75 inches, this filter fits standard 1-inch filter slots in air handlers, furnaces, and return air grilles. MERV 13 filtration captures fine particulates including dust, pollen, mold spores, pet dander, and fine respiratory droplets. This filter is sold in a 10-pack, making it a practical choice for scheduled seasonal replacements on maintenance routes.

This filter is suited for residential forced-air systems and light commercial applications where higher filtration efficiency is required without the static pressure penalty of MERV 14 or higher media. Typical install locations include upflow and horizontal gas or electric furnaces, fan coil units, and central air handlers equipped with 1-inch media racks. The 10-unit pack supports a full year of filter changes for single-system accounts or partial stocking for multi-unit service routes.

Key Features

• MERV 13 rated pleated media captures fine particulates down to 1 micron range
• Nominal size 20x21x1 inch fits standard 1-inch filter slots
• Actual size 20 x 21 x 0.75 inches for proper fit in track-style media racks
• Sold in a 10-pack for convenient bulk stocking and scheduled replacements
• Pleated design increases surface area for extended service intervals

Compatibility

Designed as a direct OEM-style replacement for residential and light commercial HVAC systems accepting a nominal 20x21x1 inch pleated air filter in a 1-inch media slot.

Installation Notes

Air filters in this category are installed by HVAC technicians or qualified service personnel during routine maintenance calls. Always shut down the air handler or furnace at the disconnect or thermostat before removing the existing filter. Verify airflow direction arrow on the filter frame matches the direction of airflow into the blower. Filters should be inspected at regular intervals and replaced when pressure drop across the media affects system airflow or indoor air quality targets.