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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12 x 12 x 12 in. Ceiling Register Box, 12 in. Round Duct Connection
$34.99Connect a 12 x 12 in. register opening to 12 in. round HVAC supply duct with this ceiling register box.Register opening: 12 x 12 in.Round duct connection: 12 in.Sheet metal register bootMeasure the...$34.99 -
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10 x 10 x 10 in. Galvanized Duct T-Wye, 45° Branch
$68.00This 10 x 10 x 10 in. sheet metal T-wye adds a 45° branch to a round HVAC duct run.Nominal openings: 10 in. x 10 in. x 10 in.Crimped outlet for joining compatible metal pipeUsed to branch air to...$68.00 -
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6 in. 45° Round Duct Saddle Tap, Sheet Metal Branch
$37.99Add a 6 in. 45° takeoff branch to a compatible round metal duct run with this sheet metal saddle tap.Nominal branch diameter: 6 in.Curved flange follows the main duct surfaceConnects a new branch to...$37.99 -
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16 in. Tabbed Round Duct Start Collar, Snap-Together Sheet Metal
$17.99Add a 16 in. round duct takeoff with this tabbed, snap-together sheet metal start collar.Nominal duct size: 16 in.Tabbed mounting edgeSnap-together constructionConfirm opening size and the...$17.99 -
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18 in. Adjustable 90 Round Sheet Metal Duct Elbow
$135.99Turn a 18 in. round HVAC duct run with this adjustable sheet metal elbow.Nominal diameter: 18 in.Adjusts from straight to a 90° bendSegmented 26-gauge steel, as listedSet the angle for your layout,...$135.99 -
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16 in. Adjustable 90 Round Sheet Metal Duct Elbow
$85.99Turn a 16 in. round HVAC duct run with this adjustable sheet metal elbow.Nominal diameter: 16 in.Adjusts from straight to a 90° bendSegmented 26-gauge steel, as listedSet the angle for your layout,...$85.99 -
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18 in. x 36 in. Snap-Lock Round HVAC Duct Pipe
$136.99Build a straight round duct run with this 18 in. diameter, 36 in. long snap-lock sheet metal pipe.Nominal diameter: 18 in.Length: 36 in.Ships flat/unsnapped for assembly at the jobsiteSnap together,...$136.99 -
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8 in. x 25 ft. Insulated Flexible HVAC Duct, R-8
$160.59Run insulated supply or return air duct with this 8 in. diameter x 25 ft. flexible duct rated R-8.Insulation rating: R-8Nominal length: 25 ft.Nominal duct diameter: 8 in.Confirm the required...$160.59 -
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14 in. Tabbed Round Duct Start Collar, Snap-Together Sheet Metal
$15.99Add a 14 in. round duct takeoff with this tabbed, snap-together sheet metal start collar.Nominal duct size: 14 in.Tabbed mounting edgeSnap-together constructionConfirm opening size and the...$15.99 -
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16 x 16 x 16 in. Ceiling Register Box, 16 in. Round Duct Connection
$55.99Connect a 16 x 16 in. register opening to 16 in. round HVAC supply duct with this ceiling register box.Register opening: 16 x 16 in.Round duct connection: 16 in.Sheet metal register bootMeasure the...$55.99 -
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18 x 18 x 18 in. Ceiling Register Box, 18 in. Round Duct Connection
$57.99Connect a 18 x 18 in. register opening to 18 in. round HVAC supply duct with this ceiling register box.Register opening: 18 x 18 in.Round duct connection: 18 in.Sheet metal register bootMeasure the...$57.99 -
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20 x 20 in. Return Air Box Plenum for Grille
$76.99This 20 x 20 in. return air box forms a plenum behind a compatible return grille.Nominal face size: 20 x 20 in.For a ceiling or floor return installationPair with a suitable start collar and return...$76.99