Duct Fabrication
Fabricating rectangular, round, spiral and flat oval duct to the SMACNA duct construction standard, followed through a second-year apprentice at a Halifax sheet metal contractor: pressure, seal and leakage classes, gauges, seams, joints and reinforcement, lined and double-wall duct, elbows, vanes, takeoffs and transitions, volume and backdraft dampers, access doors, plenums and casings, stainless and aluminum exhaust, shop workflow and quality, and a capstone school supply trunk with a full material take-off.
SMW-220 12 lessons · 3 h 51 min ▶ Video lessons coming soon
Offered by HSM University · Sheet Metal
This is the Canadian version of this course. See the American version.
What you'll learn
- Describe supply, return and exhaust duct systems, work out air velocity and velocity pressure, and explain the fabricator's place between the designer and the field crew
- Read a ductwork specification and apply the duct construction standard's pressure classes, seal classes and leakage classes to each part of a system
- Select gauges, longitudinal seams, transverse joints and panel stiffening for rectangular duct by size and pressure class
- Lay out intermediate reinforcement and tie rods for rectangular duct and fittings under positive and negative pressure
- Explain why round duct is efficient, calculate spiral strip use, and select round gauges, joints and fittings
- Fabricate flat oval, double-wall and lined duct to their stated air-side sizes, and apply the fire rules for liners, coverings and adhesives
- Build elbows, turning vanes, takeoffs and transitions that meet the standard's radius, vane, entry and slope rules
- Select, size, build and place volume, backdraft and control dampers with quadrants and access for balancing
- Build access doors, plenums and field-built casings with stiffened panels, doors opening against the pressure and draining pans
- Choose and fabricate stainless, aluminum and coated duct for corrosive exhaust while preventing contamination and galvanic corrosion
- Run a duct job through cut lists, the coil line and the plasma table, with first-piece and final checks, labelling and staging
- Take one complete supply run from specification and shop drawing to a checked, labelled and staged delivery with a material take-off
Course content
12 lessons · 3 h 51 min total · final exam
- 1 Duct systems and the fabricator's role 20 min · quiz
- 2 Duct construction standards and pressure classes 20 min · quiz
- 3 Rectangular duct construction 19 min · quiz
- 4 Reinforcement of rectangular duct 19 min · quiz
- 5 Round and spiral duct 19 min · quiz
- 6 Flat oval, double-wall and lined duct 19 min · quiz
- 7 Elbows, turning vanes, takeoffs and transitions 20 min · quiz
- 8 Volume dampers and backdraft dampers 19 min · quiz
- 9 Access doors, plenums and casings 19 min · quiz
- 10 Stainless, aluminum and coated duct for special exhaust 19 min · quiz
- 11 Fabrication workflow and quality 19 min · quiz
- 12 Capstone: the Ashgrove library supply trunk 19 min · quiz
- E Final exam 20 questions
Requirements
Recommended background. You can start any course at any time.
Description
Fabricating rectangular, round, spiral and flat oval duct to the SMACNA duct construction standard, followed through a second-year apprentice at a Halifax sheet metal contractor: pressure, seal and leakage classes, gauges, seams, joints and reinforcement, lined and double-wall duct, elbows, vanes, takeoffs and transitions, volume and backdraft dampers, access doors, plenums and casings, stainless and aluminum exhaust, shop workflow and quality, and a capstone school supply trunk with a full material take-off.