Return Air Box

Spec Sheet

Used for tying in return or exhaust air in suspended ceilings. Square end fits over grill neck. Round collar is oversized with a bead to accept pipe or flexible duct.

STR: Plain square to round adapter with a 2″ tall body.
STRB: Square to round adapter with a 4″ tall body.
STRC: Square to round adapter with a 6″ tall body.
STR-F: Square to round adapter with flange.
STR-24: Square to round adapter 24 gauge.

STR644 Square 6″ x 6″ Round 6″
STR888 Square 8″ x 8″ Round 8″
STR101010 Square 10″ x 10″ Round 10″
STR121212 Square 12″ x 12″ Round 12″
STR141414 Square 14″ x 14″ Round 14″
STR161616 Square 16″ x 16″ Round 16″
STR181818 Square 18″ x 18″ Round 18″
STR222222 Square 22″ x 22″ Round 22″