12"W X 12"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 13.6"H] Round Damper Ring Actual Filter Size – 23 Suitable for all AC 8in diameter 12125SDCLNGBX

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

2" X 10" Brass Victorian Floor Register Grille - Modern Contempo Decorative Grate - HVAC Vent Duct Cover - Brass Plated

+ Product Details Size - 28"w X 10"h is the size for the duct opening measurement only

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12"W X 12"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.6"W X 13.6"H] Round Damper Ring Actual Filter Size – 23 Suitable for all AC 8in diameter 12125SDCLNGBX Actual Filter Size – 23 3 4"w x 17 3 4" x 1" 2" X 10" Brass Victorian Floor Register Grille Modern Contempo Decorative Grate HVAC Vent Duct Cover Brass Plated