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The PRO-SOURCE PRO21521 is a MERV 13 pleated air filter designed for forced-air HVAC systems in residential and light commercial applications. It measures 16 x 25 x 2 inches nominal (actual dimensions: 15-1/2 x 24-1/2 x 1-3/4 inches) and uses a wire-backed synthetic media construction to maintain pleat shape under airflow. At MERV 13, the filter captures 80 to 85 percent of target particles, making it effective against fine dust, pollen, mold spores, and fine particulate matter. The beverage board frame provides structural rigidity. Licensed HVAC technicians and building maintenance personnel are the primary installers of this filter type.
The PRO21521 is suited for use in standard residential air handlers, packaged units, and light commercial rooftop units that accept a 16 x 25 x 2 inch filter. Its maximum rated airflow is 1,050 CFM at a maximum face velocity of 500 feet per minute (FPM). Initial resistance is 0.25 inches water gauge at 375 FPM and 0.39 inches water gauge at 500 FPM, with a final resistance rating of 1.0 inch water gauge. This filter qualifies for LEED point consideration in applicable building projects.
Designed for use with any forced-air HVAC unit that accepts a standard 16 x 25 x 2 inch filter slot, per manufacturer specification.
Installation is performed by qualified HVAC technicians or trained maintenance personnel. Power down the air handler or furnace at the disconnect before servicing the filter. Confirm the airflow direction arrow on the filter frame aligns with the direction of airflow toward the blower. Inspect the filter housing for bypass gaps and ensure the frame seats flush on all four sides before restoring power.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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