Filter King AF18x20x1-M13 Merv 13 Air Filter 18x20x1

Product Description

The FILTER KING AF18x20x1-M13 is a MERV 13 rated pleated air filter designed for residential and light commercial HVAC systems. Rated at MERV 13, it captures fine particulates including dust, pollen, mold spores, bacteria, and fine smoke particles that lower-rated filters pass through. The nominal size is 18x20x1 inches with an actual size of 17.5 x 19.5 x 0.75 inches. This filter is a standard 1-inch thick unit sold in a quantity of 10 per pack. HVAC technicians and service pros will recognize this as a drop-in replacement for any 18x20x1 filter slot requiring MERV 13 filtration performance.

This filter is suited for forced-air residential furnaces, central air conditioning systems, and air handlers that use a standard 1-inch filter rack or return-air grille. MERV 13 filtration is commonly specified in residential applications where improved indoor air quality is a priority, or in light commercial environments where occupant health and equipment protection are both concerns. The pleated media design increases surface area compared to flat-panel filters, supporting airflow efficiency while maintaining high filtration efficiency. Each pack contains 10 filters.

Key Features

• MERV 13 rating captures particles down to 0.3 to 1.0 microns including fine dust, smoke, and biological contaminants
• Pleated media design maximizes filter surface area and extends service life compared to fiberglass flat-panel filters
• Nominal size 18x20x1 inches fits standard filter slots labeled for that size
• Actual dimensions of 17.5 x 19.5 x 0.75 inches ensure proper fit without binding in the filter rack
• Sold in a 10-pack for job stocking or multi-unit service routes

Compatibility

Designed as a drop-in replacement for any residential or light commercial forced-air system using a standard 1-inch filter slot with a nominal opening of 18x20x1 inches and requiring MERV 13 filtration.

Installation Notes

Installation should be performed by a qualified HVAC technician or trained service professional. Always shut down the air handler or furnace at the system disconnect before removing or installing the filter. Confirm airflow direction arrow on the filter frame aligns with system airflow direction before seating the filter. Inspect the filter rack gasket or frame seal and replace if damaged to prevent air bypass around the filter media.