AF18x36x1-M11 Merv 11 Air Filter 18x36x1

Product Description

The AF18x36x1-M11 is a MERV 11 rated pleated air filter designed for residential and light commercial HVAC systems. Nominal size is 18 x 36 x 1 inches, with an actual size of 17.5 x 35.5 x 0.75 inches. At MERV 11, this filter captures a broad range of airborne particulates including dust, pollen, mold spores, pet dander, and fine dust particles — a common specification for systems requiring improved indoor air quality without significant airflow restriction. Pleated media construction increases surface area compared to flat fiberglass panels, supporting longer service intervals between changeouts. This filter is installed by HVAC technicians and knowledgeable building maintenance staff.

This filter fits standard 18 x 36 x 1-inch filter slots in residential and light commercial air handlers, furnaces, and fan coil units. It is sold in a quantity of 10 per order, making it suitable for maintenance accounts, multi-unit properties, or service contractors stocking filters for scheduled PM visits. The 1-inch nominal depth fits the most common filter cabinet configuration found in split systems and gas furnaces across residential applications.

Key Features

• MERV 11 rating captures dust, pollen, mold spores, and pet dander effectively
• Pleated media construction for increased surface area and longer service life
• Nominal size 18 x 36 x 1 inches fits standard residential and light commercial filter slots
• Actual size 17.5 x 35.5 x 0.75 inches for proper fit in filter tracks
• Sold in a quantity of 10 per order — practical for service contractors and PM accounts

Compatibility

Designed as an OEM-style replacement pleated filter for residential and light commercial air handlers, furnaces, and fan coil units with a nominal 18 x 36 x 1-inch filter slot.

Installation Notes

Always power down the air handler or furnace at the disconnect or breaker before opening the filter cabinet. Confirm the actual slot dimensions with a tape measure before installation, as nominal and actual filter sizes differ. Install the filter with the airflow arrow on the frame pointing toward the blower. MERV 11 filters should be inspected monthly and replaced at intervals appropriate to system runtime and local air quality conditions.