Filter King AF18X20X1-M11 Merv 11 Air Filter 18x20x1

Product Description

The FILTER KING AF18X20X1-M11 is a MERV 11 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 18x20x1 inches and an actual size of 17.5 x 19.5 x 0.75 inches, this filter installs into standard 1-inch filter slots in air handlers, furnaces, and return-air grilles. MERV 11 filtration captures finer particulates than standard fiberglass or low-rated filters, making it a solid upgrade for systems where pollen, mold spores, pet dander, and fine dust are concerns. Sold in a quantity of 10 per order, this filter is appropriate for HVAC technicians stocking service vehicles or homeowners managing multiple units or scheduled replacements.

This filter is suited for residential forced-air heating and cooling systems and light commercial applications using standard 1-inch filter housings. The pleated media construction increases surface area compared to flat panel filters, supporting adequate airflow while maintaining filtration efficiency. MERV 11 is appropriate for environments requiring improved indoor air quality without the static pressure penalties associated with higher-rated filters such as MERV 13 or above. Technicians often stock this size for common residential air handler configurations.

Key Features

• MERV 11 filtration rating for effective capture of pollen, mold spores, pet dander, and fine dust particles
• Nominal size 18x20x1 inches fits standard 1-inch filter slots
• Actual dimensions 17.5 x 19.5 x 0.75 inches for proper seating in compatible housings
• Pleated media design increases filter surface area for improved dust-holding capacity
• Sold in a quantity of 10 filters per order

Compatibility

Designed as an OEM-style replacement for residential and light commercial forced-air HVAC systems equipped with standard 1-inch filter housings accepting a nominal 18x20x1 inch filter.

Installation Notes

Air filters are typically replaced by HVAC technicians or qualified service personnel during routine maintenance. Always power down the air handler or furnace at the disconnect or breaker before removing or installing a filter. Confirm the actual slot dimensions and airflow direction arrow on the filter frame before seating the filter, and ensure the housing door or cover closes fully with no bypass gaps. Follow local mechanical codes and the equipment manufacturer's recommended replacement intervals.