Top 10 Duct Fan Adapter – HVAC Ducting

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1. AC Infinity

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6” to 4” Ducting Reducer Increaser Cone for Grow Tent Bathroom Kitchen Ventilation Systems, AC Infinity Duct Adapter

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AC Infinity #ad - Raised lips on the smaller opening for extra grip on ducting or your equipment's duct opening. Maintains airflow efficiency by creating a connection between two different sized duct openings. Adapts 6 inches to 4 inches | Product Length: 5 inches | Finish: Zinc Coating. Galvanized steel body that is corrosion-resistant and can withstand high temperatures. A ducting cone designed for adapting ductwork to equipment like bathroom fans and dust collectors.
BrandAC Infinity #ad
ManufacturerAC Infinity #ad

2. Hon&Guan

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6'' to 4'' Ducting Reducer Increaser Connector for Ventilation Systems 150 to 100, Hon&Guan Duct Adapter

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Hon&Guan #ad - 150mm female to 100mm Male Round Ducting Adaptor. Perfectly suited for ducting your tumble Dryer, Hydroponics, In-Line Extract Fans, Bathroom or Kitchen extractor fan, or Cooker Hood. On the other side there is a 100mm Male Spigot - Will fit into 100mm straight ducting. On one side there is a 150mm Female Spigot - Will fit over male fittings. Pp-plastic rigid ducting is perfect for DIY and Trade use.
BrandHon&Guan #ad
ManufacturerHon&Guan #ad
Height4 Inches
Length6 Inches
Weight5.6 ounces
Width6 Inches
Part NumberREDUCER-150-US

3. Deflecto

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Deflecto Duct Increaser and Reducer, 4” to 3” IRB43, Plastic Inline Adapter, White

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Deflecto #ad - Simply slip the ducts over the increaser/reducer, tightening in place with clamps not included. Durable polypropylene construction has a melting point of approximately 325 degrees. Ideal for bathroom fan installations. Connects a 4 inch dryer exhaust hood to a 3 inch duct. Designed to transition between 4" and 3" diameter ducts.
BrandDeflecto #ad
ManufacturerDeflecto #ad
Height4 Inches
Length4 Inches
Weight0.1 Pounds
Width3.4 Inches
Part NumberDEFIRB43
ModelIRB43
WarrantyDeflecto Duct Plastic Increaser and Reducer, 4" to a 3", (IRB43)

4. Vent Systems

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Duct Hose Dryer Vent T Connector, Vent Systems 4'' Inch Duct Connector 3 Way Hose Adapter/Splitter for Hose T-Shape Round Pipe Connector- Extractor Fan, 4 Inch 3 Way Fitting

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Vent Systems #ad - Finally, install the clamp and tighten the screw. It is suitable for hoses of 100 mm 4 inch. Wipe the tee when using it, then dock it with the hose and fix it with aluminum foil tape.

With the dryer vent hose it can be connected to exhaust fans, dryer vent covers and vent seals. The duct connector is a three-hole - 3 way connector with two branches. Made out of high quallity Metal it is a material with high strength, good toughness. The interior of the duct splitter is smooth, and its reasonable curvature greatly reduces the wind resistance. At the same time, it can discharge air from each part in the ventilation project. It is small in size, so it doesn't take up space. The dryer duct connector is seamlessly connected to achieve a good leakproof effect. Don't worry about leaking air after installation.
BrandVent Systems #ad
ManufacturerVent Systems #ad

5. Vent Systems

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Vent Systems 4'' Inch Duct Connector 3 Way Hose Adapter/Splitter for Hose T-Shape Round Pipe Connector- Extractor Fan, 4 Inch 3 Way Fitting, Duct Hose Dryer Vent T Connector

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Vent Systems #ad - The dryer duct connector is seamlessly connected to achieve a good leakproof effect. Made out of high quallity Metal it is a material with high strength, good toughness.

It is suitable for hoses of 100 mm 4 inch. It is small in size, so it doesn't take up space. Don't worry about leaking air after installation. Finally, install the clamp and tighten the screw. The duct connector is a three-hole - 3 way connector with two branches. At the same time, it can discharge air from each part in the ventilation project. With the dryer vent hose it can be connected to exhaust fans, dryer vent covers and vent seals. Wipe the tee when using it, then dock it with the hose and fix it with aluminum foil tape. The interior of the duct splitter is smooth, and its reasonable curvature greatly reduces the wind resistance.
BrandVent Systems #ad
ManufacturerVent Systems #ad

6. Vent Systems

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4 Inch 3 Way Fitting, Duct Hose Dryer Vent T Connector, Vent Systems 4'' Inch 45 Degree Duct Connector 3 Way Hose Adapter/Splitter for Hose T-Shape Round Pipe Connector- Extractor Fan

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Vent Systems #ad - It can be used outdoors and indoors, even if it is exposed to the sun and rain. Wipe the tee when using it, then dock it with the hose and fix it with aluminum foil tape.

It is suitable for hoses of 100 mm 4 inch. The interior of the duct splitter is smooth, and its reasonable curvature greatly reduces the wind resistance. The dryer duct connector is seamlessly connected to achieve a good leakproof effect. At the same time, it can discharge air from each part in the ventilation project. It is small in size, so it doesn't take up space. Don't worry about leaking air after installation. Finally, install the clamp and tighten the screw. The duct connector is a three-hole - 3 way connector with two branches. With the dryer vent hose it can be connected to exhaust fans, dryer vent covers and vent seals.
BrandVent Systems #ad
ManufacturerVent Systems #ad

7. coolerguys

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Coolerguys Thermal Plastic Duct with End Caps for Electronics and Crypto Mining 92/120mm Fan/4" 10-30"

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coolerguys #ad - Hassle-free: tubing that could be effortlessly removed, readjusted or reinserted to any desired position by snapping the tubing together. Versatile: can be bent and twisted around areas that are hard to reach or with complex design. Heat-resistant: can handle temperatures of up to -30 to 80 degrees Celsius.
Brandcoolerguys #ad
ManufacturerCoolerguys #ad
Height4 Inches
Length6 Inches
Width4 Inches
Part Number840556093480

8. coolerguys

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Enclosures, Coolerguys 120mm or 92mm Fan to 4" Ducting Shroud Funnel with Clamp for Greenhouses, Crypto Mining, and More

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coolerguys #ad - Securely fastened: Easily secure the ducting to the shroud with the included stainless steel clamp. Universal usage: will fit any 120mm or 92mm fan with standard 4" ducting. Engineered efficiency: the shroud is engineered to slightly and gradually reduce the size from the fan side to the duct side to minimize airflow blockage. Trust in products: we stand by our branded products and back them with a 3 year manufacturer warranty.
Brandcoolerguys #ad
ManufacturerCoolerguys #ad

9. CABAX

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CABAX Duct Reducer 6 to 4 inch Air Duct Adapter HAVC Pipe Connector for Inline Ventilation System 150mm to 100mm, White

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CABAX #ad - Perfectly suited for bathroom, office, kitchens, home, apartment, hotel HVAC system. Ideal to connect 6 inch 150mm to 4 inch 100mm duct system. Useful tool: can be used to connect two different size duct to creating a seamless ventilation system pipe. Durable pp-plastic material resists moisture to remain corrosion-free. Easy installation, using duct tape or duct clamps to connect air duct adapter.
BrandCABAX #ad
ManufacturerCABAX #ad

10. POWERTEC

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POWERTEC 70145 4-Inch to 3-Inch Reducer

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POWERTEC #ad - 3-inch nominal end measures 2-63/64-inch O. D. And 3-45/56-inch I. D. Connect 3-inch opening duct to 4-Inch flexible hose. Tough, durable ABS plastic material. 4-inch nominal end measures 3-15/16-inch O. D. And 2-23/32-inch I. D. Transition 3-inch duct to 4-Inch standard hose.
BrandPOWERTEC #ad
ManufacturerSouthern Technology LLC #ad
Height3.5 Inches
Length4 Inches
Weight0.02 Pounds
Width4 Inches
Part Number70145
Model70145