Purolator mx40-std4-403 Pleated Filter Merv 8 20x20x4

Product Description

The PUROLATOR mx40-std4-403 is a MERV 8 pleated air filter designed for residential and light commercial forced-air HVAC systems. Built on a heavy-duty beverage board frame with 100% hydrophobic synthetic fiber media, it delivers 35 to 40 percent average filter efficiency and 90 to 93 percent average arrestance. Airflow capacity is rated at 1,390 CFM at a rated face velocity of 500 feet per minute, with an initial resistance of 0.2 inches water gauge and a final resistance of 1.0 inch water gauge. The filter is engineered to perform as a standalone unit or as a pre-filter upstream of higher-efficiency filtration stages.

This filter is suited for residential and commercial HVAC installations where mid-range particulate capture is required without excessive static pressure penalty. The 4-inch depth with 9 pleats per linear foot increases media area to 15.7 square feet, extending service life compared to 1-inch and 2-inch alternatives. Typical applications include central air handlers, gas furnaces, and heat pump air handlers using standard filter tracks that accept a 20 x 20 x 4 inch nominal filter. It is also listed under model HE40-STD4 and cross-references manufacturer part number 5267502054.

Key Features

• MERV 8 rating per ASHRAE Test Standard 52.2-2007
• Hydrophobic synthetic fiber media resists moisture absorption
• 15.7 square feet of media area with 9 pleats per linear foot for extended service intervals
• 1,390 CFM airflow capacity at 500 feet per minute rated velocity
• Heavy-duty beverage board frame for structural integrity in installed position
• cULus Listed and UL 900 Listed; domestically manufactured

Compatibility

Designed as an OEM-style replacement pleated filter for residential and light commercial forced-air HVAC systems accepting a nominal 20 x 20 x 4 inch filter with an actual size of 19-1/2 x 19-1/2 x 3-3/4 inches. Also referenced as model HE40-STD4 and manufacturer part number 5267502054.

Installation Notes

Installation is performed by HVAC technicians or qualified service personnel. Power down the air handler or furnace at the disconnect or breaker before servicing the filter compartment. Verify the actual filter slot dimensions against the nominal and actual sizes listed before installation, as slot clearances vary by equipment manufacturer. Inspect and replace the filter per the system manufacturer's recommended maintenance schedule or when final resistance approaches 1.0 inch water gauge.