Always match the "WC rating exactly to the manufacturer's specifications

blocked return registers

though checking your specific line pressure is recommended during installation

ensuring trace-to-trace wiring alignment for HVAC technicians

High static pressure restricts airflow across the heat exchanger

Lennox X8788 Filter Freon Always match the "WC ratingWhen you're servicing a PureAir PCO20 28 air purification system, the Lennox X8788 (also designated as X878801) is the required MERV 16 pleated filter for maintaining specified static pressure and filtration efficiency. Measuring a nominal 20x26x5, with actual dimensions of 20" x 25 1 2" x 4 3 8", this Healthy Climate media is engineered to capture over 95% of particles down to 0. 3 microns, including bioaerosols, volatile organic compounds (VOCs),