3M NDP03-4S-4 Filtrete Deep Pleat Filter 20x25x4 4 Pack

Product Description

The 3M COMPANY NDP03-4S-4 is a deep pleat air filter designed for forced-air HVAC systems where improved allergen and particulate filtration is a priority. Sold as a 4-pack, each filter measures 20 inches x 25 inches x 4 inches and features a deep pleat construction that increases media surface area, extending service life while maintaining airflow. The thicker 4-inch depth makes this filter suitable for whole-home media cabinet housings rather than standard 1-inch filter slots. HVAC technicians and facility maintenance personnel typically specify this filter in residential and light-commercial applications where indoor air quality requirements call for a higher-efficiency filtration option.

This filter is intended for use in 20x25x4 inch media filter cabinets installed in residential and light-commercial forced-air heating and cooling systems. The deep pleat design is commonly found in whole-home filtration systems mounted at the air handler or furnace return-air section. The 4-pack configuration supports routine maintenance stocking, allowing multiple filter changes per service cycle without reordering. Each unit ships as an individual filter within the 4-pack quantity.

Key Features

• Deep pleat construction increases filter media surface area for extended service intervals
• 4-inch depth fits media cabinet housings designed for thick-format replacement filters
• Targets allergens and fine airborne particulates in forced-air HVAC systems
• Sold as a 4-pack for convenient maintenance stocking
• Filter size: 20 inches x 25 inches x 4 inches nominal

Compatibility

Designed as a direct replacement for 20 inches x 25 inches x 4 inches deep pleat media filter housings used in residential and light-commercial forced-air HVAC systems. Verify cabinet nominal size before installation.

Installation Notes

Installation should be performed by a qualified HVAC technician or trained maintenance personnel. Always shut down the air handler or furnace at the disconnect or thermostat before opening the filter cabinet. Confirm airflow direction arrows on the filter frame align with the system airflow direction before securing the cabinet door. Do not operate the system with an improperly seated or missing filter, as unfiltered air can contaminate the heat exchanger and blower assembly.

Technical Specifications

• Filter Size: 20 inches x 25 inches x 4 inches
• Package Quantity: 4 filters per package
• Unit of Measure: EA
• Weight: 13.12 pounds

Standard Information

• Brand: 3M COMPANY
• Manufacturer Part Number: NDP03-4S-4