The Sheet Metal Worker Red Seal exam (308A in Ontario) has 120 multiple-choice questions. The Red Seal Exam Preparation Guide gives the pass mark as 70 per cent, which means 84 correct answers, and the writing time as four hours. The questions come from five blocks, which the occupational standard calls major work activities. Installing air and material handling systems is the largest at 41 questions, then fabrication with 38, common occupational skills with 24, roofing and specialty products with 10 and maintenance and repair with 7. The Red Seal Program puts the mix at 60 to 70 per cent procedural and application, 20 to 30 per cent knowledge and recall and 5 to 15 per cent critical thinking. A formula sheet and an acronym list are provided at the sitting. The current exam is built on the 2018 standard; a 2026 standard has been published, and the Red Seal Program says exams based on it are under development.
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01What is the Sheet Metal Worker Red Seal exam?
It is the national certification exam for the trade the Red Seal Program calls Sheet Metal Worker. That is the trade title in every province and territory except Quebec, where the Program lists it as Tinsmith. 308A is Ontario's trade code, and Ontario also uses the name Sheet Metal Worker. You will also see the exam called the interprovincial (IP) exam or, in Ontario, the certifying or C of Q exam. These all name the same sitting: one interprovincial Red Seal exam.
The content is set nationally. According to the Red Seal Exam Preparation Guide, tradespeople from across Canada decide what goes into the trade's Red Seal Occupational Standard, write and review the exam questions, and decide how many questions each section gets. The exam information page for this trade says the same about the question counts. The exam is then administered by the provincial and territorial apprenticeship and certification authorities; in Ontario that is Skilled Trades Ontario.
The format is the same as every Red Seal exam: multiple choice, four options (A to D), one correct answer and one mark per question. The Sheet Metal Worker exam has 120 questions. The Red Seal Exam Preparation Guide gives the writing time as four hours, about 2 minutes per question; the exam information page for this trade does not repeat it, so confirm the time when you book. The preparation guide gives the pass mark as 70 per cent, so you need 84 correct answers and can miss 36.
The Program's description of the trade says sheet metal workers design, fabricate, assemble, install and repair sheet metal products and systems, and that they may specialize in HVAC, material handling, shop manufacture, roofing and architectural sheet metal, boiler lagging and vessel cladding, food service products or signage, among others. The preparation guide stresses that the exam covers the trade as it is practised across Canada, not only the work you do, so a duct installer still meets roofing and specialty products, and a shop fabricator still meets air balancing.
02Which standard is the exam based on?
The Red Seal trade page for Sheet Metal Worker lists two standards. The one it labels as the standard for current exams is the Red Seal Occupational Standard published in 2018 (catalogue number Em15-3/15-2018E-PDF), developed with Ontario as the host jurisdiction. The 120-question breakdown in this guide, on the exam information page and in the Self-Assessment Guide all follow that 2018 standard: 5 major work activities, 19 tasks and 77 sub-tasks.
The trade page also lists a newer standard, published in 2026 with Nova Scotia as the host jurisdiction, and says exams based on it are currently under development. The Red Seal Program gives no date for them, and it has not published a question breakdown for the 2026 standard. Its trade profile shows the same five blocks with slightly different weights, a new task on continuous learning in block A and the later tasks renumbered by one. Until the Program publishes a new breakdown, the 2018 breakdown below is the one it publishes for the current exam. Check the exam information page before you book, and ask your provincial or territorial apprenticeship office which version you will write.
03What is on the Sheet Metal Worker exam?
The Red Seal Program publishes how many questions come from each major work activity. For Sheet Metal Worker the 120 questions break down like this.
| Block | Major work activity | Questions | Share of exam |
|---|---|---|---|
| A | Performs common occupational skills | 24 | 20.0% |
| B | Performs fabrication | 38 | 31.7% |
| C | Installs air and material handling systems | 41 | 34.2% |
| D | Installs roofing and specialty products | 10 | 8.3% |
| E | Performs maintenance and repair | 7 | 5.8% |
| Total | 120 | 100% | |
Block C, installing air and material handling systems, is the heaviest at 41 questions, just over a third of the exam. Block B, fabrication, follows at 38. Those two are 79 of the 120 questions, about two in every three. Block A, common occupational skills, adds 24, so the first three blocks carry 103. The lightest are Block D, roofing and specialty products, at 10 and Block E, maintenance and repair, at 7: 17 questions between them.
The exam information page and the Self-Assessment Guide give the same counts. The Self-Assessment Guide also shows the block shares as 20, 31, 35, 8 and 6 per cent, which round to the counts above.
04What does each block cover?
The task names below are the ones the 2018 standard lists under each major work activity, with the number of questions the Red Seal Program assigns to each. The standard has 19 tasks and 77 sub-tasks, and questions are written to the sub-tasks. Every task carries questions, from 2 to 16. The largest single tasks are fabricating sheet metal components for air and material handling systems (B-6) and installing air handling system components (C-11), with 16 questions each, then pattern development (B-5) with 13 and tools and equipment (A-2) with 9.
Block A: Common occupational skills (24 questions)
Four tasks. Performs safety-related functions (5 questions) covers PPE and safety equipment, maintaining a safe work environment and lock-out and tag-out. Uses and maintains tools and equipment (9) is the widest task in the standard, with 12 sub-tasks: hand and portable power tools, shop tools and equipment, GMAW, resistance spot welding, GTAW and SMAW equipment, oxy-fuel and plasma arc cutting, soldering and brazing, measuring and layout equipment, testing and inspection devices, stationary and mobile work platforms, and hoisting, rigging and positioning equipment. Organizes work (7) covers trade documentation, interpreting drawings, organizing materials and equipment for a project, and basic design and field modifications. Uses communication and mentoring techniques (3) covers communicating at work and teaching skills to apprentices.
Free block A practice questions: Safety, Tools & Welding →
Block B: Fabrication (38 questions)
Four tasks. Performs pattern development (13 questions) covers simple and straight line layout, the parallel line, radial line and triangulation methods, and computer technology for pattern development; the standard calls pattern development the starting point of fabrication. Fabricates sheet metal components for air and material handling systems (16) covers cutting, forming, insulating and assembling ductwork, fittings and components, fabricating dampers, and fabricating hanger systems, supports and bases. Fabricates flashing, roofing, sheeting and cladding (3) covers cutting and forming them. Fabricates specialty products (6) covers cutting, forming, assembling and finishing products such as kitchen equipment, food processing and medical facility products, laboratory products, decorative accessories, and plastic and marine products.
Free block B practice questions: Pattern Layout & Fabrication →
Block C: Air and material handling systems (41 questions)
Six tasks. Prepares installation site (7 questions) covers on-site measurements, demolition for renovations, penetrations and sleeves, supports and bases, and hangers, cables, braces and brackets. Installs and connects chimneys, breeching and venting to exhaust appliances and mechanical equipment (6) covers installing the chimney, connecting appliances and equipment to it, and high efficiency appliances. Installs air handling system components (16) has nine sub-tasks: air handling equipment, ducts and fittings, dampers, fire and fire/smoke dampers, registers, grilles, diffusers and louvers, terminal boxes, coils, system accessories and plenums. Installs material handling system components (5) covers pneumatic, gravity and mechanized systems, such as dust collection and conveyance. Applies thermal insulation, lagging, cladding and flashing (3) covers applying each to components. Performs leak testing, air balancing and commissioning (4) covers leak tests, testing, adjusting and balancing (TAB), and taking part in commissioning.
Free block C practice questions: Duct Installation & Balancing →
Block D: Roofing and specialty products (10 questions)
Three tasks. Installs metal roofing and cladding/siding systems (3 questions) covers laying out roofs and walls, insulation, isolation material and building envelope components, roofing and cladding components, sealing exposed joints and installing decking. Installs exterior components (2) covers preparing the surface and fastening components such as awnings and signage. Installs specialty products (5) covers stainless steel and non-stainless steel specialty products and marine products. Installing marine products is the only one of the 77 sub-tasks the standard labels not common core. The preparation guide explains that this label means fewer than 70 per cent of provinces and territories said journeypersons perform the sub-task, and that such a sub-task gets no questions on the Red Seal exam.
Free block D practice questions: Metal Roofing & Cladding →
Block E: Maintenance and repair (7 questions)
Two tasks. Performs scheduled maintenance (3 questions) covers maintenance inspections and servicing components. Repairs faulty systems and components (4) covers diagnosing system faults and repairing worn or faulty components, in systems such as HVAC and conveyance.
Free block E practice questions: Maintenance & Repair →
05What kind of questions are they?
The Red Seal Program describes the Sheet Metal Worker question mix as knowledge and recall 20 to 30 per cent, procedural and application 60 to 70 per cent and critical thinking 5 to 15 per cent. On 120 questions that is roughly 24 to 36 recall questions, 72 to 84 procedural and 6 to 18 critical thinking.
The exam information page gives one example of each type. The recall example is about where changes to a duct system are recorded, the procedural example is about the order of steps to mount a sign cabinet on an exterior wall, and the critical thinking example works out the size of a roof opening for two insulated ducts with clearances.
The exam information page says procedural and application questions test your ability to apply your knowledge of procedures to a situation, and critical thinking questions your ability to interpret data, solve problems and reach valid conclusions. The preparation guide adds that procedural questions might include calculations, and that some critical thinking questions need an analysis of the situation and more than one calculation. For this trade, practise the next step with a drawing or a job in front of you: which layout method suits a fitting, what order an installation goes in, which damper or support a situation calls for, and how a measurement turns into a cut size. The exam information page says there are no trick questions, but the incorrect options are not always obvious.
06What do you get in the exam room?
The Red Seal Exam Preparation Guide lists what you are provided with: an exam booklet, a diagram booklet if one is required, a pencil and eraser, a calculator if needed, and a bubble sheet to record your answers. It also lists other reference material "if required": an acronym list, math formulas and code book information.
For Sheet Metal Worker the exam information page publishes both a formula sheet and an acronym list and says they will also be provided with the exam sitting. The acronym list has 19 terms, among them GMAW, GTAW, SMAW, HRV, HVAC, SMACNA, TDC, TDF, ULC, VAV and WHMIS. You get the meaning of each acronym; you still need to know how each one applies on the job. The exam information page does not mention a code book, and SkilledTradesBC's page for the trade states that no code book is provided for the Red Seal exam.
The guide's rules say no materials, bags, phones, watches or personal calculators in the room (a calculator is provided if you need one), and your province or territory may have rules of its own. More on the day itself is in what to expect on exam day.
07What is on the formula sheet?
The formula sheet runs to three pages. It covers general geometry and trigonometry (the Pythagorean theorem, the area and circumference of a circle, the volume of a cylinder, and sine, cosine and tangent as SOH, CAH and TOA), layout and fabrication (apex height, bend allowance, pattern angle, rain cap notch, mitre angle and elbow cut size for a gored elbow, swing point radius, and wrapper or belt length), and air and drives (cfm from area and velocity, BTU per hour from cfm and temperature difference, grille area and grille size from free area, the unknown side of a duct, belt length, new rpm, and the fan laws relating cfm, pulley diameter and static pressure to rpm). It tells you to use the calculator's pi button and to round off only the final answer.
The sheet gives you the formula, not the method. It does not tell you which formula a question needs, how to set up a triangle on a transition or an offset, or which dimension is the slant side. That is where pattern development (13 questions) and the fabrication and installation tasks meet the arithmetic, and the official critical thinking example, a roof penetration sized from duct dimensions, insulation and clearances, needs no formula from the sheet, only careful addition of dimensions.
Practise with the sheet beside you until you can pick the right line quickly: a stretchout from a diameter, the true length of a line in triangulation, a mitre angle and cut size for a four-gore elbow, cfm through a grille at a given free area, and the change in airflow when a pulley is swapped. Our free Sheet Metal Worker practice questions include worked examples.
08Is Sheet Metal Worker a Red Seal trade in every province?
Yes. The Red Seal Program lists Sheet Metal Worker as a designated Red Seal trade in all thirteen provinces and territories: Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, the Northwest Territories, Nunavut, Ontario, Prince Edward Island, Quebec, Saskatchewan and Yukon. The trade title is Sheet Metal Worker in all of them except Quebec, which uses Tinsmith. The Program designated the trade in 1958, and its NOC code is 72102. The trade is compulsory in Ontario, according to Skilled Trades Ontario, and in British Columbia, where SkilledTradesBC lists it among its Skilled Trades Certification (compulsory) trades.
Each province and territory administers the exam and sets eligibility, fees and rewrite rules. See the Ontario Red Seal exam guide, British Columbia, Alberta, Quebec or the guides by province, compare Red Seal exam fees by province, and read what happens if you fail the Red Seal exam before you book. If you have the experience but no apprenticeship, see how to challenge the Red Seal exam.
09How do you become a Red Seal sheet metal worker in Ontario?
In Ontario the trade is Sheet Metal Worker (308A). Skilled Trades Ontario lists it as compulsory: to practise it legally you must hold a Registered Training Agreement, a Provisional Certificate of Qualification or a Certificate of Qualification and appear on its Public Register, and the certificate must be renewed to stay valid. Its trade page gives the apprenticeship as 9,000 hours, approximately five years: 8,280 hours of on-the-job work experience and 720 hours of in-school training over three levels. Its 2025 trade report gives the same split (720 hours of technical training is six months across three levels), with Grade 10 as the academic entry level. Passing the certifying exam earns the Certificate of Qualification, and the trade page says the trade is part of the Red Seal Program under the title Sheet Metal Worker. The 2025 report counts 279 Sheet Metal Worker Certificates of Qualification issued. If you have the experience but did not apprentice in Ontario, Skilled Trades Ontario's Trade Equivalency Assessment is the route to the exam.
Ontario also has a separate trade, Residential (Low Rise) Sheet Metal Installer (308R): compulsory, 4,500 hours over two levels of in-school training, with its own Ontario Certificate of Qualification exam built on Ontario's training standard. Skilled Trades Ontario does not list 308R as a Red Seal trade, and it is not the exam this guide covers. The national 2018 standard recommends four levels of technical training and 7,200 total training hours, and notes that each jurisdiction implements this in its own way; Ontario's 308A figures are the ones above.
10How hard is the Sheet Metal Red Seal exam?
It is demanding in three ways. First, the procedure: 60 to 70 per cent of the questions are procedural, so knowing a term is rarely enough; you have to know what to do next. Second, the scope: the standard covers shop fabrication, pattern development, HVAC and material handling installation, chimneys and venting, insulation and cladding, air balancing, roofing, specialty products and maintenance, at the level of a journeyperson anywhere in Canada. If you mostly install duct, the 38 fabrication questions may be the part you do least; if you work in the shop, the 41 installation questions may be. Third, the geometry: the formula sheet gives you the formulas, but pattern layout and the calculations around it depend on method you bring with you.
We found no pass rate published by the Red Seal Program, for this trade or any other, and no ranking of the trades by difficulty. The provincial figures we found, each counted a different way, are set out in how hard is the Red Seal exam. What the published breakdown does tell you is where the weight sits: blocks C and B are 79 of the 120 questions.
11How much does a Red Seal sheet metal worker make?
For Ontario, Skilled Trades Ontario's 2025 trade report for Sheet Metal Worker (308A) gives an annual range of $59,000 to $98,000 and an hourly range of $30 to $50, from Workforce Planning Ontario's Labour Market Insights Report 2025. The report notes that its figures apply to the National Occupational Classification code 72102 and that other trades or occupations may be included, so they describe the occupation in Ontario, not Red Seal holders alone. Pay elsewhere in Canada is not covered by that report.
12How should you prepare?
Follow the weights. In order: C (41), B (38), A (24), D (10) and E (7). Blocks C and B together are 79 of 120 questions. The three largest tasks, fabricating components for air and material handling systems (16), installing air handling system components (16) and pattern development (13), hold 45 of the 120 on their own.
You need 84 correct answers. If you answered three in four of the 79 questions in C and B correctly, about 59, you would still need 25 of the other 41, so block A matters too: its 24 questions include 9 on tools and equipment, from welding and cutting to rigging. Give C and B about two thirds of your time, A most of the rest, and do not skip D and E: their 17 questions are almost half of the 36 you can miss.
Rate yourself on each of the 19 tasks with the three levels in the Red Seal Self-Assessment Guide for Sheet Metal Worker and write down how many questions you expect to get right; a low rating on a large task is your first priority. Work layout problems by hand with the formula sheet beside you, and learn the 19 acronyms on the exam list. The preparation guide tells you to answer every question, even if you have to guess. Timed practice tests help too, so your practice score shows which areas still need work before exam day. For a full method, see how to study for the Red Seal exam.
Official links: the Sheet Metal Worker trade page, the 2018 standard the current exam is built on (PDF), the exam information page (the breakdown, the question mix with three examples, the formula sheet and the acronym list) and the Self-Assessment Guide.
13Questions people ask
- How many questions are on the Sheet Metal Red Seal exam?
- The Sheet Metal Worker Red Seal exam (308A in Ontario) has 120 multiple-choice questions. Each has four options and one correct answer. The Red Seal Exam Preparation Guide gives the pass mark as 70 per cent, which means 84 correct answers, and a four-hour writing time, about 2 minutes per question. The questions come from five blocks: air and material handling systems 41, fabrication 38, common occupational skills 24, roofing and specialty products 10 and maintenance and repair 7.
- Is there a formula sheet on the Sheet Metal Red Seal exam?
- Yes. The Red Seal Program's exam information page for Sheet Metal Worker publishes a three-page formula sheet and says it will be provided with the exam sitting, along with a 19-term acronym list. The sheet covers geometry and trigonometry, layout formulas such as bend allowance, pattern angle, mitre angle and elbow cut size, and airflow formulas such as cfm, BTU per hour, grille free area and the fan laws. No code book is provided. The Red Seal Exam Preparation Guide says a calculator is provided if you need one.
- Is the Sheet Metal Worker exam changing to the 2026 standard?
- The Red Seal Program has published a 2026 Red Seal Occupational Standard for Sheet Metal Worker and says exams based on it are currently under development. It gives no date. Its trade page lists the 2018 standard as the basis for the current exams, and the 120-question breakdown on its exam information page follows the 2018 standard. Check that page, and your provincial or territorial apprenticeship office, before you book.
- Is Sheet Metal Worker a Red Seal trade in every province?
- Yes. The Red Seal Program lists Sheet Metal Worker as a designated Red Seal trade in all thirteen provinces and territories. The title is Sheet Metal Worker everywhere except Quebec, where it is Tinsmith. The trade is compulsory in Ontario (308A) and British Columbia. Each province or territory administers the exam and sets its own eligibility, fees and rewrite rules.
- How long is the Sheet Metal Worker apprenticeship in Ontario?
- Skilled Trades Ontario gives the Sheet Metal Worker (308A) apprenticeship as 9,000 hours, approximately five years: 8,280 hours on the job and 720 hours of in-school training over three levels. The academic entry level is Grade 10. The trade is compulsory in Ontario, and passing the certifying exam earns a Certificate of Qualification that must be renewed to stay valid.
14Sources
- Red Seal Program: Sheet Metal Worker exam information: 120 questions, the question count for each major work activity and task, the question mix with one example of each question type, and the formula sheet and acronym list provided with the exam.
- Red Seal Program: Sheet Metal Worker trade page: the provinces and territories where the trade is designated Red Seal, the trade titles they use, the designation year, the NOC code, and the two standards, with exams on the 2026 standard under development.
- Red Seal Program: Sheet Metal Worker standard for current exams (2018): the 2018 standard and its host jurisdiction.
- Red Seal Occupational Standard: Sheet Metal Worker (2018, PDF): the 5 major work activities, 19 tasks and 77 sub-tasks, the common core label, and the harmonization recommendations.
- Red Seal Program: Sheet Metal Worker Red Seal Occupational Standard (2026): the 2026 standard, its host jurisdiction and the statement that exams based on it are under development; its trade profile for the 2026 block weights.
- Red Seal Program: description of the Sheet Metal Worker trade: what sheet metal workers do and the specialties they work in.
- Red Seal Program: Sheet Metal Worker formulas (PDF): the formula sheet provided with the exam.
- Red Seal Program: Sheet Metal Worker acronyms (PDF): the acronym list provided with the exam.
- Red Seal Exam Self-Assessment Guide: Sheet Metal Worker (PDF): the question count and share per major work activity and task, and the three-level self-rating used in the preparation section.
- Red Seal Exam Preparation Guide: exam format, pass mark, writing time, question types, exam supplies and exam room rules.
- Skilled Trades Ontario: Sheet Metal Worker: the trade's compulsory status and renewal, the apprenticeship hours and levels, the certifying exam and Certificate of Qualification.
- Skilled Trades Ontario: Sheet Metal Worker (308A) 2025 trade report: the entry level, the apprenticeship hours, the certificates issued and the pay ranges.
- Skilled Trades Ontario: Residential (Low Rise) Sheet Metal Installer: the separate 308R trade, its compulsory status and hours.
- SkilledTradesBC: Sheet Metal Worker: the trade's compulsory (Skilled Trades Certification) status in British Columbia and the note that no code book is provided for the Red Seal exam.
- Skilled Trades Ontario: Trade Equivalency Assessment: the Ontario route for experienced workers who did not complete an Ontario apprenticeship.
The question counts were checked against the Red Seal Program's exam information page and Self-Assessment Guide for Sheet Metal Worker, and the task and sub-task lists come from the 2018 Red Seal Occupational Standard; the formula sheet and acronym list are the ones linked from the exam information page. The provinces and territories where the trade is designated, the provincial titles, the designation year and the two standards (2018 for current exams, 2026 with exams under development) come from the Program's trade page and standard overview pages, read on October 18, 2026. The Ontario status and hours come from Skilled Trades Ontario's trade page; the entry level, certificate count and pay ranges from its 2025 trade report; the British Columbia status and the code book note from SkilledTradesBC. The four-hour writing time and the 70 per cent pass mark are the Red Seal Exam Preparation Guide's. If the Red Seal Program changes the breakdown, its page is the final word. If you find one of ours out of date, tell us.
Related: Sheet Metal Red Seal practice exam (308A) · Free Sheet Metal Red Seal practice questions (308A) · How many questions are on the Red Seal exam · Red Seal exam pass mark · Red Seal exam day · Red Seal exam fees by province · All guides
15Practice for this exam
TicketPrep 308A practice tests are weighted to the breakdown above, block by block, and every answer is explained, all four options. You can try five sample questions with no account.
Ten free questions per trade, no account: free practice questions. How our questions are written and checked: how our questions are made.