Google reviewsSpiral Pipe & Round Duct
Round spiral pipe and matching fittings manufactured in Kennewick, with diameters from 6 to 42 inches. Discuss single-wall, lined and double-wall options for your HVAC project, connection details and required material.
From Pro Duct’s supplied company photo collection.
Pro Duct manufactures spiral pipe in diameters from 6 to 42 inches, along with round duct and fittings for commercial and residential projects. Our shop works with galvanized steel, galvanneal and carbon steel; stainless steel round duct is also part of our fabrication offering. Whether the duct will remain exposed or sit above a ceiling, the order starts with the same practical details: diameter, length, material, wall configuration, fitting geometry and connections. Bring your plans so we can review the complete package.
Fabrication options
- Spiral pipe from 6 to 42 inches in diameter
- Single-wall round duct
- Lined round duct
- Double-wall spiral pipe
- Stainless steel round duct
- Round elbows and taps
- Round reducers and metal caps
Round runs, planned as a system
Straight pipe is only one part of a working route. Elbows turn the run, taps create branches, and transitions connect different sizes or shapes. Include those pieces in your takeoff and identify their positions on the drawing. Reviewing the pipe and fittings together gives us a clearer picture of the project and the connections your installer expects to make.
Single-wall, lined or double-wall
Choose the configuration specified for the application. Single-wall pipe has one metal shell; lined and double-wall assemblies introduce additional construction details that affect the usable opening and finished size. If insulation or acoustical performance is specified, send those requirements with the order. Confirm whether a stated diameter describes the clear airflow passage or the outside of the finished assembly.
Details that matter for exposed duct
When round duct remains visible, the layout becomes part of the room. Identify exposed sections and any finish requirements before fabrication. We can review joint locations, fitting proportions and the requested material alongside your drawings. Share access restrictions and available space as well: those details help establish practical section lengths and how the pieces will move into the building.
What to send us
- Pipe diameter and whether it is an inside or outside dimension
- Section lengths, quantities and a fitting takeoff
- Material, gauge and required finish
- Wall configuration and end connections
- Installation location and required project date
Common questions
What spiral pipe sizes do you manufacture?
Our stated spiral pipe range is 6 to 42 inches in diameter. Send the material and wall configuration with your size request so we can confirm the specific order.
Can I order pipe and fittings together?
Yes. Include a drawing or list showing the straight lengths, elbows, branches, reducers and connections you need.
Is spiral pipe available with insulation?
We offer lined and double-wall configurations. The project specification determines the insulation and construction details; include those details when requesting a quote.