3M NADP03-4IN-4 Filtrete 1000 Mpr 20x25x4 Deep Pleat Filter 4-pack

Product Description

The 3M COMPANY NADP03-4IN-4 is a deep pleat air filter sold in a 4-pack, rated at 1000 Microparticle Performance Rating (MPR) and sized at 20 inches x 25 inches x 4 inches. Marketed under the Filtrete line, this filter is designed for forced-air HVAC systems where a deeper media bed improves particulate capture without requiring frequent changeouts. The 4-inch depth provides extended surface area compared to standard 1-inch filters, supporting longer service intervals. HVAC technicians and building maintenance professionals install this filter type in residential and light commercial air handlers and furnace systems.

This filter fits air handlers and furnaces with a 4-inch filter rack or media cabinet accepting a 20 x 25 x 4 nominal frame. The 1000 MPR rating targets common airborne allergens including dust, pollen, and pet dander, making it a practical choice for residential forced-air systems where indoor air quality is a service priority. The 4-pack format suits contractors stocking filters for multiple units or service agreements requiring periodic filter replacement on a schedule.

Key Features

• 1000 MPR rating targets allergens, dust, and pollen particles
• Deep pleat 4-inch media bed extends filter life compared to standard 1-inch filters
• Nominal size 20 inches x 25 inches x 4 inches fits standard 4-inch media cabinets
• Sold as a 4-pack, reducing per-unit cost for service contractors
• Each filter sold as a single unit of measure (EA) within the 4-pack configuration

Compatibility

Designed as a direct-fit replacement for residential and light commercial forced-air furnace and air handler systems with a 4-inch media filter cabinet or rack accepting a 20 x 25 x 4 nominal filter frame.

Installation Notes

Filter replacement is a standard HVAC maintenance task performed by licensed technicians or qualified service personnel. Always power down the air handler or furnace at the disconnect or thermostat before accessing the filter cabinet. Confirm airflow direction marked on the filter frame matches the direction of airflow through the system before securing the cabinet door. Follow local HVAC codes and manufacturer service guidelines for recommended replacement intervals.