10" x 10" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 3-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 13" x 13"] w28h28 + Product Details Size - Width_20in These won t hinder RFG1620 FBA

+ Product Details Size - 26"w X 18"h X 2"d (for duct opening measurement only)

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

+ Product Details Size – 28"w X 12"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 32 5/8" height -

Actual Filter Size – 23 3/4"w x 17 3/4" x 1"

10" x 10" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 3 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 13" x 13"] w28h28 + Product Details Size Width_20in These won t hinder RFG1620 FBA + Product Details Size 26"w X 18"h X 2"d (for duct opening measurement only) Actual Filter Size – 13 3 4"w x 27 3 4" x 1"