A rectangular sidewall grille attaches to a typical exposed duct using a minimum of six countersunk screws. A closed-cell foam gasket is installed all around the board to provide a tight seal around the opening in the duct. An internal volume damper regulates airflow immediately behind the grille assembly.
TYPICAL EXPOSED DUCT ATTACH GRILLE TO DUCT WITH MNIMUM OF (6) CONTERSUNK SCREWS PROVIDE CLOSED CELL FOAM GASKET ALL AROUIND BOARD TO PROVIDE A THIGHT SEAL AROUND OPENING IN DUCT VOLUME DAMPER
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