Key Features

• MERV 13 Filtration – Captures pollen, dust, pet dander, smoke, mold spores, bacteria, and particles as small as 0.3 microns.
• LEED & ASHRAE Certified – Meets strict ASHRAE 52.2 standards and qualifies for LEED Green Building credits.
• Moisture-Resistant Design – Heavy-duty beverage board frame and water-repellent adhesive resist warping and degradation.
• Rust-Proof Support – Galvanized steel pleat support grid ensures structural integrity and consistent performance.
• Energy Efficient – Low airflow resistance helps reduce energy consumption while maintaining excellent filtration.

Technical Specifications

Compatible HVAC Systems

These Glasfloss ZL filters are designed for any HVAC system that accepts a standard 20x20x1 nominal size filter (actual size 19-1/2" x 19-1/2" x 3/4"). Commonly used in:

• Residential homes and apartments
• Commercial office buildings
• Hospitals and healthcare facilities
• Schools, universities, and educational institutions
• Food processing plants and restaurants
• Telecom/data centers and sensitive electronic environments

Important: Always confirm your current filter's actual size before ordering. This filter is not compatible with 20x20x2, 20x25x1, or other non-matching sizes.

Easy Installation Guide

Replacing your air filter takes just minutes:

1. Power Off: Turn off your furnace or air conditioner for safety.
2. Locate Filter Slot: Usually found in the return air duct, air handler, or near the blower unit.
3. Remove Old Filter: Pull out the old filter. Note the airflow direction (arrows on the frame).
4. Install New Filter: Slide in the new Glasfloss filter, making sure the airflow arrow points in the same direction as before.
5. Check Fit: Ensure the filter sits flush with no gaps around the edges.
6. Power On: Restart your HVAC system and enjoy noticeably cleaner air.

Pro Tip: Mark your calendar to replace every 90 days for peak performance and energy efficiency.

Why Choose Glasfloss ZL MERV 13?

Perfect for allergy sufferers, pet owners, families with young children, or anyone who values superior indoor air quality. These American-made filters combine high-efficiency filtration with durability and low energy impact. Protect your health, your HVAC system, and your indoor environment with the trusted performance of Glasfloss ZL pleated filters.