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Duct Flanges
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With Mounting Holes | With Mounting Holes |
Mount flanges to air handlers and HVAC equipment to start a run of duct. They also create a secure joint between sections of duct—attach a flange to each piece. Also known as angle rings.
With Mounting Holes—Ready to install, these flanges secure with screws.
PVC—Withstand chemicals that would eat away at most metal duct. It’s often used in systems that exhaust corrosive gases, vapors, and fumes.
Flange | Mounting | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Duct Size | ID | Overall Dp. | Ht. | Thk. | Fasteners Included | No. of Holes | Hole Dia. | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
With Mounting Holes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
PVC | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 4 | 4 1/2" | 2 1/4" | 1 7/8" | 1/4" | No | 4 | 5/16" | 000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 6 | 6 5/8" | 3 1/4" | 1 1/2" | 1/4" | No | 8 | 5/16" | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 8 | 8 5/8" | 3 1/4" | 1 1/2" | 1/4" | No | 10 | 5/16" | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 10 | 10 3/4" | 3 1/4" | 1 3/8" | 1/4" | No | 12 | 5/16" | 0000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 12 | 12 3/4" | 3 1/2" | 1 3/8" | 1/4" | No | 16 | 5/16" | 0000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 14 | 14" | 3 1/2" | 1 3/4" | 1/4" | No | 16 | 5/16" | 0000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 16 | 16" | 3 1/2" | 1 3/4" | 1/4" | No | 18 | 5/16" | 0000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Chemical-Resistant Duct and Fittings
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Chemicals can eat away at most metal duct, but not this PVC system. It’s often used to exhaust corrosive gases, vapors, and fumes. Components press-fit together and secure with PVC pipe cement.
90° Elbow Connectors
45° Elbow Connectors
Straight Connectors
Tee Connectors
Straight Reducers
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Transition between duct of different diameters. Reducers also join larger duct with smaller duct that connects to equipment.
45° Wye Saddles
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A more gradual change of direction than tees, wye saddles add onto existing ductwork without disassembling it. Cut a hole in your duct and then install the saddle over the opening.
Spiral Duct and Fittings
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Reinforced with a continuous seam, this duct keeps its shape, even against suction from dust collection systems. On the inside, duct is smooth for efficient airflow. Because of its attractive look, spiral duct is often used for exposed heating and cooling systems.
90° Elbow Connectors
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Change the direction of airflow when joining lengths of duct.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
45° Elbow Connectors
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Change the direction of airflow when joining lengths of duct.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
Straight Connectors
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Join two lengths of duct.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
Tee Connectors
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Split or merge airflow paths.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
45° Wye Connectors
 |
Split or merge airflow more gradually than tees. With less abrupt changes in direction, wyes reduce turbulence for smoother flow.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
Straight Reducers
 |
Transition between duct of different diameters. Reducers also join larger duct with smaller duct that connects to equipment.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
Duct Size | OD | Chemical-Resistant PVC-Coated Steel | |||||
|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | Ga. | Each | ||
| 5 | 4 | 4 7/8" | 3 7/8" | 20 | 00000000 | 000000 | |
| 6 | 4 | 5 7/8" | 3 7/8" | 20 | 00000000 | 00000 | |
| 6 | 5 | 5 7/8" | 4 7/8" | 20 | 00000000 | 00000 | |
| 7 | 6 | 6 7/8" | 5 7/8" | 20 | 00000000 | 00000 | |
| 8 | 6 | 7 7/8" | 5 7/8" | 20 | 00000000 | 00000 | |
| 8 | 7 | 7 7/8" | 6 7/8" | 20 | 00000000 | 00000 | |
| 9 | 8 | 8 7/8" | 7 7/8" | 20 | 00000000 | 00000 | |
| 10 | 8 | 9 7/8" | 7 7/8" | 20 | 00000000 | 000000 | |
| 10 | 9 | 9 7/8" | 8 7/8" | 20 | 00000000 | 000000 | |
| 12 | 10 | 11 7/8" | 9 7/8" | 20 | 00000000 | 000000 | |
Tee Reducers
 |
Connect duct of different diameters to split or merge airflow.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
45° Wye Reducers
 |
Connect duct of different diameters to split or merge airflow more gradually than tees. With less abrupt changes in direction, wyes reduce turbulence for smoother flow.
Chemical-Resistant PVC-Coated Steel—This duct combines the strength of steel with the chemical resistance of plastic. More economical than 304 stainless steel and stronger than PVC, it’s often used to exhaust corrosive gases, vapors, and fumes.
Airflow Dampers for Chemical-Resistant Duct
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Turn the lever on these dampers to regulate airflow in PVC duct. They withstand chemicals that would break down most metal components. Secure to duct with PVC pipe cement (not included).
