Spiral Ductwork & Air Handling Systems

The 2-foot rule generally refers to the guideline that duct supports or hangers should be spaced no more than 2 feet apart for smaller-diameter spiral duct runs, ensuring structural stability and preventing sagging. Actual hanger spacing requirements vary based on duct diameter, weight, and applicable standards such as SMACNA. Always consult your system specifications or a design professional.

Smooth (longitudinal seam) duct has a flat, seamless wall, while spiral duct features a continuous helical seam formed during rolling. Spiral duct offers superior structural rigidity, lower air leakage rates, and generally better airflow efficiency due to its round cross-section. It is preferred in industrial and commercial HVAC, dust collection, and ventilation applications where performance and durability are priorities.

Duct Incorporated manufactures spiral pipe in galvanized steel, galvaneal, stainless steel 304, stainless steel 316, and aluminum. Material selection depends on the application environment — stainless steel suits corrosive or food-grade environments, aluminum is lightweight and corrosion-resistant, while galvanized steel is the standard choice for general HVAC and industrial ventilation systems.

Spiral pipe is available from 3 inches up to 80 inches and beyond. Standard diameters include 3 through 16 inches with defined gauge specifications — 24 gauge for 3", 22 gauge for 4–13", and 20 gauge for 14–16" — with larger custom diameters available for heavy industrial and material handling applications.

LaserLock is Duct Incorporated's modular clamp-together duct system designed for fast, tool-friendly installation. Components — including pipe sections, elbows, adapters, and branches — lock together with clamps rather than requiring welding or sheet metal screws, making it ideal for industrial ventilation, dust collection, and material handling systems where reconfiguration or quick assembly is needed.

Yes. Duct Incorporated offers fully custom-fabricated suction hoods and custom hoods designed to match specific process requirements, inlet geometries, and pipe sizes. Custom fabrication is also available for transitions and other specialty fittings, and design assistance is provided to ensure the hood or fitting integrates correctly with the broader duct system.