![14"w X 6"h Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 15.75"w X 7.75"h] - Heating Vents - Amazon.com](https://m.media-amazon.com/images/I/71NasBb415L._AC_SL1500_.jpg "14\"w X 6\"h Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 15.75\"w X 7.75\"h] - Heating Vents - Amazon.com")
14"w X 6"h Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 15.75"w X 7.75"h] - Heating Vents - Amazon.com
![18" X 22" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face -White [Outer Dimensions: 19.75w X 23.75h] :](https://m.media-amazon.com/images/I/819Hvc0BpDL._AC_SS450_.jpg "18\" X 22\" Steel Return Air Filter Grille for 1\" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face -White [Outer Dimensions: 19.75w X 23.75h] :")
18" X 22" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face -White [Outer Dimensions: 19.75w X 23.75h] :
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Amazon.com: 12" w X 12" h Aluminum Privacy Door HVAC Air Grille - V Shaped Louvers Ensure 100% View Block - Supply or Return [Outer Dimensions: 13" w X 13" h] :
![Amazon.com: 18"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 19.75"w X 9.75"h] : Everything Else](https://m.media-amazon.com/images/I/610cs8QU63L._AC_SX569_.jpg "Amazon.com: 18\"w X 8\"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 19.75\"w X 9.75\"h] : Everything Else")
Amazon.com: 18"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 19.75"w X 9.75"h] : Everything Else
![30"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75"w X 9.75"h] - - Amazon.com](https://m.media-amazon.com/images/I/61PaJ-8x2uL._AC_SS450_.jpg "30\"w X 8\"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75\"w X 9.75\"h] - - Amazon.com")
30"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75"w X 9.75"h] - - Amazon.com
![12"w X 6"h Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 13.75"w X 7.75"h] - Heating Vents - Amazon.com](https://m.media-amazon.com/images/I/61LVrw6IVeL._AC_SX679_.jpg "12\"w X 6\"h Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 13.75\"w X 7.75\"h] - Heating Vents - Amazon.com")
12"w X 6"h Adjustable AIR Supply Diffuser - HVAC Vent Cover Sidewall or Ceiling - Grille Register - High Airflow - White [Outer Dimensions: 13.75"w X 7.75"h] - Heating Vents - Amazon.com
![Amazon.com: 22" x 22" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 23.75w X 23.75"h] : Everything Else](https://m.media-amazon.com/images/I/81i96p9UhIL._AC_SX679_.jpg "Amazon.com: 22\" x 22\" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 23.75w X 23.75\"h] : Everything Else")
Amazon.com: 22" x 22" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 23.75w X 23.75"h] : Everything Else
Air Duct Sizing Calculator - Ductulator - Amazon.com
14 x 8 inch Vent Duct Cover Air Supply HVAC Sidewall or Ceiling Grille Register with Multi-Shutter Parallel Blade Damper - Color White - High Airflow. Aluminum. Duct Hole Must Measure 14"
![Amazon.com: 8" x 32" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 9.75w X 33.75"h] : Everything Else](https://m.media-amazon.com/images/I/71mDb9P5CjL._AC_SL1500_.jpg "Amazon.com: 8\" x 32\" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 9.75w X 33.75\"h] : Everything Else")
Amazon.com: 8" x 32" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 9.75w X 33.75"h] : Everything Else
Amazon.com: cold air return vent
![Amazon.com: 4" X 4" Linear Designer Aluminum Supply Air Grille – for Ceiling, Wall, Floor Use - HVAC Vent Duct Cover Diffuser – [White] [Outer Dimensions: 5.75w X 5.75h] : Everything Else](https://m.media-amazon.com/images/I/71MZFIowh3L._AC_SX355_.jpg "Amazon.com: 4\" X 4\" Linear Designer Aluminum Supply Air Grille – for Ceiling, Wall, Floor Use - HVAC Vent Duct Cover Diffuser – [White] [Outer Dimensions: 5.75w X 5.75h] : Everything Else")
Amazon.com: 4" X 4" Linear Designer Aluminum Supply Air Grille – for Ceiling, Wall, Floor Use - HVAC Vent Duct Cover Diffuser – [White] [Outer Dimensions: 5.75w X 5.75h] : Everything Else
Duct Outlet 8" x 8" Ceiling Box, w/ 8" Round Collar - Connects Register Vent and Diffuser HVAC - - Amazon.com
Duct Outlet 8" x 8" Ceiling Box, w/ 8" Round Collar - Connects Register Vent and Diffuser HVAC - - Amazon.com
![Amazon.com: 4" x 4" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 5.75w X 5.75" h] : Everything Else](https://m.media-amazon.com/images/I/71d3gSH20wL._AC_SL1500_.jpg "Amazon.com: 4\" x 4\" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 5.75w X 5.75\" h] : Everything Else")
Amazon.com: 4" x 4" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 5.75w X 5.75" h] : Everything Else
Amazon.com: Return Air Grill
![12" X 12" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face -White [Outer Dimensions: 13.75w X 13.75h] - -](https://m.media-amazon.com/images/I/71A0H0ZJzXL._AC_SS450_.jpg "12\" X 12\" Steel Return Air Filter Grille for 1\" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face -White [Outer Dimensions: 13.75w X 13.75h] - -")
12" X 12" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face -White [Outer Dimensions: 13.75w X 13.75h] - -
![30"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75"w X 9.75"h] - - Amazon.com](https://m.media-amazon.com/images/I/61l7T5DwJGL._AC_SS450_.jpg "30\"w X 8\"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75\"w X 9.75\"h] - - Amazon.com")
30"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 31.75"w X 9.75"h] - - Amazon.com
Amazon.com: HVAC Premium 12" X 12" 1-Way Fixed Curved Blade AIR Supply Diffuser - Vent Duct Cover - Grille Register - Sidewall or Ceiling - High Airflow - White : Tools & Home Improvement
![Amazon.com: 12"w X 4"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 13.75"w X 5.75"h] : Everything Else](https://m.media-amazon.com/images/I/61B2ugeOUnL._AC_SX355_.jpg "Amazon.com: 12\"w X 4\"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 13.75\"w X 5.75\"h] : Everything Else")
Amazon.com: 12"w X 4"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 13.75"w X 5.75"h] : Everything Else
HVAC Ducting | Amazon.com | Building Supplies - HVAC
HBW 12"x 8" (Duct Opening Size) 3-Way Stamped Face Steel Ceiling/sidewall Air Supply Register - Vent Cover - Actual Outside Dimension 13.75" X 9.75" - - Amazon.com
![Amazon.com: 10" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Face/Door - HVAC Duct Cover - Flat Stamped Face - White [Outer Dimensions: 12.5 X 7.75] : Everything Else](https://m.media-amazon.com/images/I/81BIYRSbuPL._AC_SL1500_.jpg "Amazon.com: 10\" X 6\" Steel Return Air Filter Grille for 1\" Filter - Removable Face/Door - HVAC Duct Cover - Flat Stamped Face - White [Outer Dimensions: 12.5 X 7.75] : Everything Else")
Amazon.com: 10" X 6" Steel Return Air Filter Grille for 1" Filter - Removable Face/Door - HVAC Duct Cover - Flat Stamped Face - White [Outer Dimensions: 12.5 X 7.75] : Everything Else
![16"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 17.75"w X 9.75"h] - Heating Vents - Amazon .com](https://m.media-amazon.com/images/I/71pIIdOvVvL._AC_SX355_.jpg "16\"w X 8\"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 17.75\"w X 9.75\"h] - Heating Vents - Amazon .com")
16"w X 8"h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 17.75"w X 9.75"h] - Heating Vents - Amazon .com
![Amazon.com: 16" w X 20" h Aluminum Adjustable Return/Supply HVAC Air Grille - Full Control Horizontal Airflow Direction - Vent Duct Cover - Single Deflection [Outer Dimensions: 17.85" w X 21.85" h] :](https://m.media-amazon.com/images/I/81Rgdsq6LmL._AC_SX522_.jpg "Amazon.com: 16\" w X 20\" h Aluminum Adjustable Return/Supply HVAC Air Grille - Full Control Horizontal Airflow Direction - Vent Duct Cover - Single Deflection [Outer Dimensions: 17.85\" w X 21.85\" h] :")
Amazon.com: 16" w X 20" h Aluminum Adjustable Return/Supply HVAC Air Grille - Full Control Horizontal Airflow Direction - Vent Duct Cover - Single Deflection [Outer Dimensions: 17.85" w X 21.85" h] :
![Amazon.com: 4" x 20" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 5.75w X 21.75" h] : Everything Else](https://m.media-amazon.com/images/I/71SFJBZ+tSL._AC_SY879_.jpg "Amazon.com: 4\" x 20\" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 5.75w X 21.75\" h] : Everything Else")
Amazon.com: 4" x 20" Return Air Grille - Sidewall and Ceiling - HVAC Vent Duct Cover Diffuser - [White] [Outer Dimensions: 5.75w X 21.75" h] : Everything Else
20" X 20" Steel Return Air Filter Grille for 1" Filter - Easy Plastic Tabs for Removable Face/Door - HVAC Duct Cover - Flat Stamped Face - White [Outer Dimensions: 22.5 X
![Amazon.com: 12" X 10" 2-Way-Vertical AIR Supply Grille - Vent Cover & Diffuser - Flat Stamped Face - White [Outer Dimensions: 13.75"w X 11.75"h]: Home & Kitchen](https://m.media-amazon.com/images/I/71zbX-T9m+L._AC_SX466_.jpg "Amazon.com: 12\" X 10\" 2-Way-Vertical AIR Supply Grille - Vent Cover & Diffuser - Flat Stamped Face - White [Outer Dimensions: 13.75\"w X 11.75\"h]: Home & Kitchen")