AC Infinity 6-to-4-Inch Galvanised Steel Duct Reducer / Increaser Cone

The AC Infinity AC-SDR64 connects 6-inch and 4-inch ducting and ventilation equipment. Made from heavy-gauge galvanised steel with a protective zinc coating, this adapter provides durable structural support, corrosion resistance and high-temperature tolerance for residential HVAC, grow tents and workshop dust-extraction systems.

Its smooth 5.11-inch conical taper helps transition airflow between the two port sizes while reducing turbulence and air resistance. The 4-inch end has a raised ridge lip for a secure grip on flexible ducting or equipment collars, while the 6-inch end has a flat rim for a flush fit against larger fans or duct runs.

Key Features

• Smooth conical taper: Gradually transitions airflow between 6-inch and 4-inch ports to help reduce turbulence and static-pressure loss.
• Galvanised steel and zinc coating: Designed to withstand heat, high airflow and continuous moisture.
• Raised grip lip on the 4-inch end: Helps prevent flexible ducting and rubber couplers from slipping when secured with worm-drive clamps or foil tape.
• Bi-directional use: Works as both a reducer from 6 inches to 4 inches and an increaser from 4 inches to 6 inches.
• Universal HVAC compatibility: Connects with 6-inch and 4-inch inline fans, range hoods, bathroom exhaust fans and dust collectors.

Technical Specifications

Real-World Applications

• Indoor cultivation ventilation: Adapts a 6-inch inline fan or carbon filter to a 4-inch duct line when fitting out smaller grow rooms or tents.
• Home HVAC and utility venting: Connects 6-inch range hoods, tumble dryers or bathroom exhaust fans to existing 4-inch duct runs.
• Woodworking dust collection: Connects 6-inch dust-collection ports to 4-inch hoses for tools such as table saws, planers and sanders.