Filter King AF20x21x1A-M11 Merv 11 Air Filter 20x21x1

Product Description

The FILTER KING AF20x21x1A-M11 is a MERV 11 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 20x21x1 and an actual size of 20 x 21 x 0.75 inches, this filter fits standard 1-inch filter slots and delivers mid-range filtration performance. MERV 11 filtration captures particles such as dust mites, mold spores, pet dander, and fine dust, making it a solid choice for households with pets or mild allergy concerns. Licensed HVAC technicians and experienced DIYers install this filter as part of routine preventive maintenance.

This filter is suited for residential forced-air furnaces, central air conditioning systems, and heat pumps using a standard 1-inch return-air filter slot. It is sold in a quantity of 10 per order, making it practical for stocking multiple units across service accounts or for scheduled maintenance intervals. The pleated media construction supports consistent airflow while maintaining effective particle capture at the MERV 11 rating.

Key Features

• MERV 11 rating captures fine particulates including pet dander, mold spores, and dust mite debris
• Nominal size 20x21x1 fits standard 1-inch residential filter tracks
• Actual dimensions 20 x 21 x 0.75 inches for precise fit in designated housings
• Pleated media design maximizes surface area for improved dust-holding capacity
• Sold in a pack of 10 for convenient bulk stocking

Compatibility

Designed as an OEM-style replacement for residential and light commercial forced-air HVAC systems requiring a nominal 20x21x1 inch, 1-inch pleated air filter with MERV 11 performance.

Installation Notes

Air filters are typically installed by HVAC technicians or qualified building maintenance personnel. Always shut down the air handler or furnace at the system disconnect before replacing the filter. Verify airflow direction arrows on the filter frame align with the direction of airflow toward the blower. Follow local codes and equipment manufacturer guidelines for recommended filter replacement intervals, generally every 60 to 90 days under normal operating conditions.