Color: Silver white The opening dimensions of the wooden frame (inside dimensions) should be installed with about 0.2 inches (5 mm) more than the register torso measurement.
From the Manufacturer
Square Register
The opening dimensions of the wooden frame (inner dimensions) are installed with about 0.2 inches (5 mm) more than the register torso measurement.
Material: ABS resin.
5.9 x 7.9 inches (150 x 200 cm); Effective ventilation area 42.9 inches (1
7.9 x 9.8 inches (200 x 250 mm). Effective ventilation area 7.2 inches (18