16" X 4" 2-Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall/Ceiling Register, White Compatible With Duct 12in actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 22 5/8" width X 42 5/8" height -

Design – removable door/face for easy filter change & cleaning - uses a 1" thick filter

actual front end outer dimensions are approximately 22 5/8" width X 52 5/8" height

Actual Filter Size – 33 3/4"w x 29 3/4" x 1"

For 6" Round Duct Opening - Spiral or Flex

16" X 4" 2 Way Air Supply Grille – Steel HVAC Vent Cover with Damper, Wall Ceiling Register, White Compatible With Duct 12in actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 22 5 8" width X 42 5 8" height Design – removable door face for easy filter change & cleaning uses a 1" thick filter