Filter King AF25x37x4A-M8 Pleated Air Filter Merv 8

Product Description

The FILTER KING AF25x37x4A-M8 is a MERV 8 pleated HVAC air filter designed for forced-air residential and light commercial systems. With a nominal size of 25x37x4 inches and an actual size of 25 x 37 x 3.75 inches, this 4-inch-depth filter fits a wide range of return-air filter housings and media cabinets. At MERV 8, it captures dust, pollen, mold spores, and lint-sized particles, making it a solid step up from standard fiberglass panels without significantly restricting airflow. HVAC technicians and building maintenance professionals typically install this filter during routine preventive maintenance calls.

This filter is suited for residential furnaces, air handlers, and heat pump systems that accept a 4-inch media filter. The 4-inch depth provides more surface area than standard 1-inch filters, extending service life and reducing the frequency of change-outs. It is well matched to systems with media cabinet housings sized for 25x37 nominal filter stock. Sold in a quantity of 10 per order, making it practical for multi-unit service routes or stocking a supply van.

Key Features

• MERV 8 filtration rating captures dust, pollen, mold spores, and similar mid-range particulates
• Nominal size 25x37x4 inches with an actual size of 25 x 37 x 3.75 inches for proper housing fit
• 4-inch media depth extends filter life compared to 1-inch or 2-inch alternatives
• Pleated media design increases surface area for improved dust-holding capacity
• Sold in a pack of 10, suitable for multi-unit service or van stock

Compatibility

Designed as an OEM-style replacement for forced-air HVAC systems that accept a 25x37 nominal, 4-inch-depth pleated media filter in a standard media cabinet housing.

Installation Notes

Installation is performed by a qualified HVAC technician or trained maintenance professional. Always shut down the air handler or furnace at the disconnect before replacing the filter. Confirm the actual cabinet opening dimensions match the actual filter size of 25 x 37 x 3.75 inches before installation, and ensure the airflow-direction arrow on the filter frame is oriented toward the blower. Dispose of the used filter in accordance with local waste guidelines.