20"w x 6"h is the NOMINAL SIZE. The ACTUAL SIZES of this diffuser are: 19-1/2''w x 5-1/2''h (INTERNAL) and 21.875" w x 8" h (EXTERNAL) - SEE "HOW TO MEASURE A GRILLE" IN THE INFORMATION BELOW.
Full 180 degrees - vertical & horizontal - control of air direction.
Multi shutter damper with easy handle lever gives you full control over direction and amount of airflow: Horizontal flaps open down (lever opens and closes them). Vertical flaps are adjustable to the left or right. (They are manually adjustable). NOTE: This damper can also be shut completely.
The product comes in a sealed transparent plastic wrapping. Screws for installation are included.
OPTIONAL COLORS: aluminum gray and matt black (on request). Finish: Baked Electrostatic paint (Epoxy-Polyester).