18" x 18" x 1" Replacement Air Filter, Pleated, Merv 8

The Purolator HE40-18X18X1 Hi-E 40 Pleated Air Filter is a professional-grade filtration component engineered for HVAC and air handling systems requiring medium-efficiency particulate control. Designed for consistent performance and long service intervals, this MERV 8-rated filter provides efficient dust and particulate removal while maintaining low resistance to airflow. Its durable construction, uniform pleat geometry, and moisture-resistant frame make it suitable for continuous-duty air filtration in commercial and industrial environments.

Details

• Model Number: HE40-18X18X1
• Manufacturer: Purolator
• Product Type: Hi-E 40 Pleated Air Filter
• Part Number: 1977130
• Nominal Size: 18 inch x 18 inch x 1 inch
• Actual Size: 17-3/4 inch (W) x 17-3/4 inch (H) x 3/4 inch (D)
• Media Type: Synthetic pleated filter media
• Frame Material: Heavy-duty moisture-resistant beverage board
• MERV Rating: MERV 8 (per ASHRAE 52.2)
• Temperature Rating: 225 °F (107 °C) maximum continuous operation
• Airflow Resistance: Low initial pressure drop with stable resistance throughout service life
• Reinforcement: Expanded metal backing for pleat support and rigidity
• Construction: Mechanically bonded pleated media to frame for dimensional stability
• Application: Commercial, industrial, and institutional HVAC systems requiring medium-efficiency particulate filtration
• Compliance: Meets UL 900 Class 2 flame resistance and ASHRAE 52.2 efficiency standards

Professional Specifications

The Purolator Hi-E 40 HE40-18X18X1 pleated air filter utilizes a high-strength synthetic media designed to capture airborne particulates such as dust, pollen, and biological contaminants with MERV 8-rated efficiency. The pleated media provides a high surface area-to-volume ratio, improving dust-holding capacity while maintaining minimal airflow resistance. Reinforced with an expanded metal grid, the pleats remain uniform under varying air velocities. The moisture-resistant beverage board frame maintains structural integrity under high humidity and elevated temperature conditions, supporting consistent operation up to 225 °F. This filter is designed for installation in air handlers, rooftop units, and return air plenums used in commercial and industrial HVAC systems.

Summary

The Purolator HE40-18X18X1 Hi-E 40 Pleated Air Filter delivers MERV 8 efficiency, durable construction, and stable performance for professional air handling systems. Its synthetic pleated media, rigid moisture-resistant frame, and high-temperature capability ensure reliable filtration and long service life in demanding HVAC environments.