HVAC Ductwork
Shop HVAC ductwork and installation supplies for residential and light-commercial heating, air-conditioning and evaporative-cooling systems. Our selection includes insulated flexible duct, galvanized sheet-metal duct fittings, round duct pipe, elbows, reducers, start collars, T-wye fittings, register boxes, return-air boxes and related installation materials.
Use Flexible Duct for insulated supply and return-air runs, or browse Metal Duct Fittings for components used to connect, transition, branch and terminate an HVAC duct system. Duct tape, cable ties and related fasteners are also available for securing compatible connections.
Before ordering, verify the duct diameter, fitting dimensions, connection type, insulation rating and available installation space. HVAC duct sizing affects airflow and system performance, so ductwork should be selected and installed according to the equipment requirements and applicable building codes.
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14 x 10 in. Round Sheet Metal Duct Reducer
$44.99Connect two different round duct sizes with this 14 x 10 in. sheet metal reducer.Nominal connection sizes: 14 in. and 10 in.For transitioning between compatible round HVAC ductsConfirm both...$44.99 -
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18 in. Round Duct Disc Damper with Hardware
$26.99Control airflow in a 18 in. round metal supply duct with this disc damper and hardware.Nominal duct diameter: 18 in.Disc sets the opening angle inside the ductHardware included as listedVerify duct...$26.99 -
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12 x 12 in. Return Air Box Plenum for Grille
$45.99This 12 x 12 in. return air box forms a plenum behind a compatible return grille.Nominal face size: 12 x 12 in.For a ceiling or floor return installationPair with a suitable start collar and return...$45.99 -
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8 x 6 x 6 in. Wall or Floor Register Box, 6 in. Round Duct Connection
$29.99Connect a 8 x 6 in. register opening to 6 in. round HVAC supply duct with this wall or floor register box.Register opening: 8 x 6 in.Round duct connection: 6 in.Sheet metal register bootMeasure the...$29.99 -
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20 x 18 in. Round Sheet Metal Duct Reducer
$71.99Connect two different round duct sizes with this 20 x 18 in. sheet metal reducer.Nominal connection sizes: 20 in. and 18 in.For transitioning between compatible round HVAC ductsConfirm both...$71.99 -
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4 x 3 x 3 in. Galvanized Duct T-Wye, 45° Branch
$30.00This 4 x 3 x 3 in. sheet metal T-wye adds a 45° branch to a round HVAC duct run.Nominal openings: 4 in. x 3 in. x 3 in.Crimped outlet for joining compatible metal pipeUsed to branch air to another...$30.00 -
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5 in. Round Sheet Metal Flexible Duct Connector
$13.99Join a 5 in. flexible duct run to compatible sheet metal ductwork with this round connector.Nominal connection size: 5 in.Sheet metal fitting for a flexible duct connectionConfirm the connector...$13.99 -
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10 x 9 in. Round Sheet Metal Duct Reducer
$27.99Connect two different round duct sizes with this 10 x 9 in. sheet metal reducer.Nominal connection sizes: 10 in. and 9 in.For transitioning between compatible round HVAC ductsConfirm both connection...$27.99 -
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16 in. Round Duct Disc Damper with Hardware
$23.99Control airflow in a 16 in. round metal supply duct with this disc damper and hardware.Nominal duct diameter: 16 in.Disc sets the opening angle inside the ductHardware included as listedVerify duct...$23.99 -
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4 in. Adjustable 90 Round Sheet Metal Duct Elbow
$12.99Turn a 4 in. round HVAC duct run with this adjustable sheet metal elbow.Nominal diameter: 4 in.Adjusts from straight to a 90° bendSegmented 26-gauge steel, as listedSet the angle for your layout,...$12.99 -
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10 x 6 x 6 in. Galvanized Duct T-Wye, 45° Branch
$68.00This 10 x 6 x 6 in. sheet metal T-wye adds a 45° branch to a round HVAC duct run.Nominal openings: 10 in. x 6 in. x 6 in.Crimped outlet for joining compatible metal pipeUsed to branch air to another...$68.00 -
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14 x 8 x 8 in. Wall or Floor Register Box, 8 in. Round Duct Connection
$54.99Connect a 14 x 8 in. register opening to 8 in. round HVAC supply duct with this wall or floor register box.Register opening: 14 x 8 in.Round duct connection: 8 in.Sheet metal register bootMeasure the...$54.99