The Don Park BE082228 22 in. x 8 in. rectangular block end cap is a professional-grade termination fitting built for large residential and commercial air distribution systems. This cap is designed to slide directly over or into the open end of a 22×8-inch rectangular trunk line, sealing the airflow path completely. Properly capping off the end of a main duct run is necessary to maintain proper static pressure, ensuring that air is delivered effectively through supply registers.
Manufactured from 28-gauge galvanized steel, this block end cap provides an optimal blend of rigid strength and field workability. The 28-gauge metal resists oil-canning and bowing when exposed to high-velocity air streams or cycling pressures within the main plenum lines. Its protective galvanized zinc layer keeps the underlying steel safe from ambient moisture and thermal condensation, preventing the formation of rust over years of service.
When finalizing your ductwork assembly, confirm that the 22×8-inch rectangular dimensions correspond exactly with your sheet metal trunk profile. Installers typically mount this end cap using standard S-cleats, drive cleats, or mechanical screws depending on the specific edge preparation of the duct line. To ensure a leak-proof seal, apply approved duct mastic or foil-backed tape to all overlapping perimeter seams.
Leave a Reply