Be sure to take advantage of this deal on the 24" x 4" Single Deflection Adjustable Grille, Parallel to Long Dimension, Opposed Blade Damper in white (Shoemaker 901-0-24X4) while supplies last online here at PlumbersStock. The airfoil aluminum blades are adjustable and run parallel to the longest dimension. It provides 2-way airflow on one plane. It runs quietly because of nylon bushings that prevent metal from rattling. The opposed blade damper is adjustable with the use of a screwdriver. Shoemaker is a popular HVAC brand among both homeowners and contractors for good reason.
The Shoemaker 901-0 Series vent cover comes with a recessed screwdriver-operated opposed blade damper. It is used to regulate the airflow through linked sections of adjacent blades that rotate in the opposite direction. Compared to other damper types, an opposed blade damper maintains a more even airflow. It also provides better control over the airflow in all operating positions. A recessed screwdriver-operated damper prevents any unnecessary adjustments of the damper setting. Be sure to measure the hole opening size instead of measuring the face plate of your old grille. This grille is designed to fit over a 24" x 4" existing hole or duct. Refer to the Specification Sheet for more information.