14" x 20" x 1" Replacement Air Filter, Pleated, Merv 8

Purolator Hi-E® 40 Pleated Air Filter – Technical Product Information

The Purolator Hi-E® 40 Series Pleated Air Filter (Model MX40-STD1-139-14X20X1) is a medium-efficiency air filtration element engineered for professional HVAC and air handling applications. Constructed with a moisture-resistant beverage board frame and 100% hydrophobic synthetic media, the Hi-E® 40 filter provides consistent airflow, dimensional stability, and extended service life. Designed for both new installations and retrofit applications, this filter achieves MERV 8 performance in accordance with ASHRAE 52.2 standards, making it suitable for use as a primary or secondary stage in commercial and industrial filtration systems.

Technical Specifications

• Product Code: MX40-STD1-139-14X20X1
• Manufacturer: Purolator
• Series: Hi-E® 40
• Model: HE40-STD1
• Nominal Size: 14 x 20 x 1 inch
• Actual Dimensions: 13-1/2 inch (Width) x 19-1/2 inch (Height) x 3/4 inch (Depth)
• Available Depths: 1", 2", and 4"
• Media Type: 100% Synthetic, Un-dyed, Hydrophobic
• Media Color: White
• Frame Material: Moisture-Resistant Beverage Board
• Performance Rating: MERV 8 (per ASHRAE 52.2)
• Airflow Capacity: 585 CFM (Cubic Feet per Minute)
• Initial Resistance: 0.27 in. wg at rated airflow
• Final Recommended Resistance: 1.0 in. wg
• Average Dust Spot Efficiency: 35–40%
• Average Arrestance: Approximately 95%
• Maximum Operating Temperature: 225°F (107°C)
• Construction Features:
  • Rigid die-cut beverage board frame with structural reinforcement
  • Mechanically bonded pleated media for consistent airflow and dust holding
  • Even pleat spacing to maintain low pressure drop and efficient particulate capture
  • Non-corrosive materials suitable for variable humidity and temperature environments
• Applications:
  • Commercial HVAC systems and air handlers
  • Industrial filtration units and ventilation systems
  • Institutional, healthcare, and laboratory facilities
  • Prefilter use ahead of higher-efficiency filters in multi-stage systems
• Installation Orientation: Install with airflow arrow in direction of system flow
• Compliance: ASHRAE 52.2; UL 900 Classified

Professional Summary

The Purolator Hi-E® 40 MERV 8 Pleated Air Filter provides a durable, medium-efficiency solution for contractors and mechanical professionals requiring consistent filtration performance. Its hydrophobic synthetic media maintains structural integrity and efficiency in both humid and dry conditions, while the reinforced beverage board frame ensures mechanical strength during installation and operation. Designed for use as a standalone filter or as a prefilter in multi-stage configurations, the Hi-E® 40 supports stable airflow, predictable pressure drop, and extended service life in professional HVAC and air handling applications.