Demonstration should include accounting for weather conditions and
- horizontal ventilation, accounting for
- exposures
- location of openings
- vertical ventilation, accounting for
- roof types
- safety
- existing roof opening
- trench
- tools
- mechanical ventilation, accounting for positive and negative pressure
- hydraulic ventilation, accounting for use of a hand line.
Process/Skill Questions:
- When using horizontal ventilation, how are the locations of the openings determined?
- What safety precautions need to be followed when using vertical ventilation?
- What determines the choice to use positive or negative pressure for mechanical ventilation?
- How can hand tools be used to clear an opening for ventilation?