Custom Fabrication of a Fixed Venturi for a Tunnel application

Custom Fabrication of a Fixed VenturiThe city of Boston needed 28 of these Fixed Venturi’s fabricated as part of a ventilation system within a tunnel. The customer supplied detailed drawings which called for compliance with AWS D1.1 welding code. Each venturi was constructed from A-36 carbon steel; the flat plate was cut using our CNC burning capabilities, which allows us to maximize material use. The cut components where then formed and inspected for dimensional accuracy. A mounting rim was fabricated to align all of the components for assembly, which were then FCAW welded, and again inspected to verify the required AWS D1.1 compliance. After fabrication the venturi’s had a durable zinc based epoxy/urethane paint applied. Each finished unit measured 6′ in diameter, with material thickness of 3/16″. For more on this project see the table below or contact us directly.

Request a Quote

Highlights of these Precision Formed Steel Components

Product Description

These Fixed Venturi’s are used as part of ventilation within a tunnel.

Custom Fabrication Capabilities Applied/Processes

CNC Burning

  • Cut Flat Plate to Correct Geometries

FCAW Welding

  • Assembled to Mounting Rims

3-Coat Paint System

Overall Part Dimensions

Material Thickness: 3/16″
Diameter: Ø6′

Material Used

A-36 Carbon Steel

Material Finish

Zinc Based Epoxy/Urethane Paint

In process testing/inspection performed


Industry for Use

Tunnel Construction



Delivery Location


Standards Met

Customer supplied print, 2D CAD Drawing
AWS D1.1

Product Name

Fixed venture Inlet