Filter King AF18x18x1-M11 Merv 11 Air Filter 18x18x1

Product Description

The FILTER KING AF18x18x1-M11 is a MERV 11 pleated air filter designed for residential and light commercial HVAC systems. With a nominal size of 18x18x1 inches and an actual size of 17.5 x 17.5 x 0.75 inches, this filter fits standard 1-inch filter slots without modification. The MERV 11 rating means it captures finer particulates than lower-rated filters, including dust, pollen, mold spores, pet dander, and some fine dust particles. Sold in packs of 10, this filter is a practical stocking choice for service contractors and property managers maintaining multiple units on a regular replacement schedule.

This filter is suited for forced-air heating and cooling systems using standard 1-inch filter tracks. Typical applications include residential furnaces, air handlers, and heat pumps where a step up from basic filtration is required without the added static pressure of higher MERV ratings. The 10-unit pack quantity makes it a logical bulk-buy for technicians servicing multiple properties or homeowners on a quarterly change-out schedule.

Key Features

• MERV 11 rating captures dust, pollen, mold spores, and pet dander
• Nominal size 18x18x1 inches fits standard 1-inch filter slots
• Actual size 17.5 x 17.5 x 0.75 inches for proper fit without binding
• Pleated media design increases surface area for improved airflow and particle capture
• Sold in a 10-pack for bulk stocking and scheduled maintenance programs

Compatibility

Designed as an OEM-style replacement for residential and light commercial forced-air HVAC systems requiring a 1-inch filter with a nominal size of 18x18x1 inches.

Installation Notes

Air filters of this type are installed by HVAC technicians or qualified building maintenance personnel. Always shut down the air handler or furnace at the disconnect or thermostat before replacing the filter. Confirm the airflow direction arrow on the filter frame is oriented toward the blower, not the return. Check the filter track for debris or deformation that could allow air bypass around the filter frame.