Michigan LARA license exam · given by PSI
Ductwork practice test
Practice for the Michigan Ductwork mechanical contractor exam: duct construction, installation and support, system design, plenums, exhaust systems, and chimneys and vents. (80 questions total: 10 free + 70 in the paid pass.)
Exam format from the PSI candidate bulletin. Exam fee: $50.
Practice the Ductwork exam
Topic drills (pass required)
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Refunds: within 7 days of purchase, if you haven’t finished a full mock exam and have seen fewer than 10% of the paid questions. Try the free 10-question sample before you buy. Refund policy
Review status: pending licensed mechanical contractor review. These are original questions written to the PSI content outline and referenced to the Michigan mechanical code and LARA’s reference list. Calculations were checked by script, but no licensed mechanical contractor has reviewed them yet, so we don’t claim they are expert-reviewed. Spot an error? Use “Report this question” on any item.
What’s on the exam
| Topic | Our estimated weight | In our mock | Bank |
|---|---|---|---|
Michigan law (PA 407 Article 8, PA 230)
| 9% | 5 | 7 |
Duct construction and materials
| 20% | 11 | 15 |
Duct installation, support, sealing, and insulation
| 16% | 9 | 12 |
Duct design and sizing (Manual D)
| 16% | 9 | 13 |
Plenums, fire/smoke dampers, and smoke detection
| 13% | 7 | 11 |
Exhaust systems (dryer, environmental, kitchen)
| 14% | 8 | 12 |
Chimneys, vents, and vent connectors
| 12% | 6 | 10 |
About the weights: PSI doesn’t publish topic weights. These are our estimate.
Test-day facts
- Computer-based at PSI test centers, after LARA approves your application.
- Open book: bring unmarked, bound copies of the references LARA lists for this classification.
- Questions on PA 407 (the Skilled Trades Regulation Act) and PA 230 appear on every classification exam.
Sources: PSI Candidate Information Bulletin 5421 (mechanical, effective Aug 20, 2026) · LARA mechanical exam reference materials (PDF). Checked October 30, 2026. Rules and fees change, so confirm with LARA and PSI before you apply.
Ductwork exam FAQ
How many questions are on the Ductwork exam?
PSI’s bulletin lists 55 questions in 60 minutes, open book, with 75% to pass.
What does it cost?
PSI lists $50.
Are these the real exam questions?
No. MI Trade Prep questions are original practice items written to PSI’s published content outline. They are not actual exam questions, and MI Trade Prep is not affiliated with LARA or PSI.
Study guide: Michigan Ductwork exam guide