Based on the Red Seal Sheet Metal Worker standard, duct fabrication, pattern drafting & ventilation systems
Practice on the go and jump straight back to where you left off.
About the certification
In Ontario and across Canada, Sheet Metal Worker is designated trade code 308A. The written Certificate of Qualification exam is administered through Skilled Trades Ontario and provincial apprenticeship authorities. Sheet Metal Worker is a Red Seal designated trade, so passing the qualifying examination awards both provincial certification and the Interprovincial Red Seal endorsement.
The Red Seal Sheet Metal Worker exam contains 120 multiple-choice questions with a 70% pass mark (84/120), and candidates are allotted up to 4 hours (240 minutes). Competencies are grounded in the Red Seal Occupational Standard (RSOS), covering pattern drafting (parallel line, radial line, triangulation), duct fabrication (Pittsburgh locks, snap locks, grooved seams), airflow calculation ($Q = V \times A$), fan affinity laws, fire damper installation, and architectural sheet metal roofing.
ExamHub's free 308A practice quiz includes 200 original questions across all 5 official exam blocks, complete with step-by-step calculations and trade citations.
What's covered
Categories follow the Red Seal Major Work Activity breakdown, balancing duct fabrication, layout drafting, system installation, and architectural roofing.
Try a few
Five sample questions from the question bank with detailed calculation steps shown.
Why: O. Reg. 213/91 s. 26 lists the hazards that trigger the fall protection rules in ss. 26.1 to 26.9; the first is falling more than 3 metres. The 1.2 metre threshold applies only where the work area is used as a path for a wheelbarrow or similar equipment, and the other listed hazards (operating machinery, liquids, hazardous substances, openings) apply at any height.
Why: Heel radius = throat radius + duct width in the plane of the bend = 6 in. + 12 in. = 18 in.
Why: Arc angle θ = (Base Radius / Slant Height) × 360° = (6 / 18) × 360° = 1/3 × 360° = 120 degrees.
Why: Area = (24 in × 12 in) / 144 sq in/sq ft = 288 / 144 = 2.0 sq ft. Airflow Q = V × A = 1,000 FPM × 2.0 sq ft = 2,000 CFM.
Why: OBC s. 9.26.5.1(1): eave protection extends from the edge of the roof a minimum of 900 mm up the roof slope to a line not less than 300 mm inside the inner face of the exterior wall. The 24 in. (600 mm) 'inside the wall' figure is not the Ontario rule.
FAQ
The interprovincial Red Seal Sheet Metal Worker (308A) exam consists of 120 multiple-choice questions. ExamHub's practice question bank includes 200 questions, and Test Mode delivers a full 120-question timed simulation.
The passing grade is 70% (84 correct answers out of 120 questions). Candidates are allotted 4 hours (240 minutes) to complete the test.
Yes. In Ontario, Sheet Metal Worker (trade code 308A) is a compulsory trade administered by Skilled Trades Ontario. Practicing technicians must hold a valid Certificate of Qualification or be registered apprentices.
The exam is divided across 5 Major Work Activities: Common Occupational Skills (24 Qs), Fabrication (38 Qs), Installation of Air & Material Handling Systems (41 Qs), Roofing & Specialty Products (10 Qs), and Maintenance & Repair (7 Qs).
No. These are original practice questions created by ExamHub based on the Red Seal Occupational Standard (RSOS), Skilled Trades Ontario curriculum guidelines, National Building Code Part 6 & 9, and trade math principles. They are designed for study practice and are not copies of actual exam questions.