$44.95
• ~30 minutes • English & Spanish • Instant printable certificate
Complete the online course at your own pace, pass the written test, and download your Certificate of Completion immediately.
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Confined space atmospheres kill quickly and invisibly. Oxygen deficiency causes unconsciousness in seconds; hydrogen sulfide and methane accumulate in sewers, manholes, and tanks; engulfment in loose material buries workers under crushing weight. Because the hazard cannot be seen, the untrained instinct — climb in and pull your coworker out — is the single deadliest decision in confined space work.
OSHA regulates confined spaces under 29 CFR 1910.146 (general industry) and 29 CFR 1926 Subpart AA (construction). Both standards require that entrants, attendants, and entry supervisors be trained before assignment, that the atmosphere be tested before and during entry, and that a rescue plan exist before anyone goes in — not after something goes wrong.
Our confined space training covers the full entry system: how spaces are classified as permit-required or non-permit, what an entry permit must document, how to test the atmosphere in layers from the lip to the bottom, how to size and position blower ventilation, and what entry and non-entry rescue actually look like.
The course teaches the actual blower math and duct placement rules — here is the worked example from the training.
| Step | Worked Example from the Course |
|---|---|
| 1. Volume of the space | Length × Width × Height → 12 ft × 15 ft × 15 ft = 2,700 cubic feet |
| 2. Blower throughput | Blower rated 900 CFM → 2,700 ÷ 900 = one exchange every 3 minutes |
| 3. Safety margin | 3 min × 1.15 = 3.45 min per exchange |
| 4. Exchanges per hour | 60 ÷ 3.45 = 17.4 exchanges/hour — fails the 20/hour requirement; a higher-CFM blower is required |
| Duct Placement Rule | Number |
|---|---|
| Fresh-air intake distance from exhaust outlet | at least 5 ft, and upwind of the opening |
| Duct outlet from the contaminant source | 1 ft |
| Duct outlet below the breathing zone | 1 ft |
| Duct distance from workers | 3 ft |
| Vertical manhole duct depth | ¾ of the way down, within 15 ft of the work area |
For combustible atmospheres: pull air out (negative pressure), use grounded, explosion-proof blowers, and eliminate ignition sources downwind. Static risk rises below 50% humidity.
This confined space training covers the complete OSHA entry framework, drawn directly from our field training program:
These visuals come directly from the Confined Space Training course your team will take — practical, field-tested material, not stock theory.
On completing the course and passing the written examination, you receive a Certificate of Completion demonstrating basic knowledge of confined space hazards and entry requirements — the documented classroom training OSHA expects before site-specific assignment.
Your employer then applies this foundation to your specific spaces, permits, and rescue plan. That is exactly how OSHA structures confined space competency: general knowledge first, site-specific procedures second.
