OHST Practice Exam 2026 – The Comprehensive All-in-One Guide to Exam Success!

A canopy hood is primarily designed to capture and remove airborne contaminants generated by hot processes. This includes operations such as welding, furnace use, or other activities that produce significant heat and vapor. The hood is strategically positioned above the source of heat and contamination to effectively trap these emissions, ensuring that harmful substances do not linger in the workplace air.

In contrast, while welding processes can emit fumes and require ventilation systems, the specific design and purpose of a canopy hood make it less suited for capturing welding fumes compared to other options. Paint spray booths, on the other hand, typically require specialized ventilation systems designed for the unique challenges of spray paint applications, including the need for filtered air circulation. Degreasing tanks produce vapors as well, but the method of capturing emissions from these processes often involves different types of hoods or extraction systems tailored for liquid chemicals and solvents.