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An auxiliary ventilation system takes air from the flow-through system and distributes it to the mine workings via temporarily mounted ventilation fans, Venturi tubes and disposable fabric or steel ducting. Auxiliary fan and duct systems may be either forcing systems, where fresh air is pushed into mine headings, or exhausting systems that draw ...
Confined space training outlines the skills and protocols for safe entry to confined spaces, and includes precautions such as locking and tagging out connecting piping, testing of breathable air quality, forced ventilation, observation of workers in the space, and a predetermined rescue plan with appropriate safety harnesses and other rescue ...
Forced draft – A mechanical draft tower with a blower type fan at the intake. The fan forces air into the tower, creating high entering and low exiting air velocities. The low exiting velocity is much more susceptible to recirculation. With the fan on the air intake, the fan is more susceptible to complications due to freezing conditions.
The piping sizes supplying the air knives can be as little as 1 ⁄ 4 in (6.4 mm) diameter, so they are ideal for confined spaces. Blower-powered air knives must be larger in size along with larger diameter supply piping, but the efficiency improvement over compressed air is easily justified with the electrical power cost savings.
Because axial fans are designed to blow air straight down at the floor, they can be used in ceiling and roof structures over 100 ft. tall. Because axial destratification fans can achieve destratification with low CFMs, it is imperative that the air leaving the nozzle achieve an air speed at the floor of between 0.2 and 0.5 m/s.
Spaces where space contamination is normal, or similar to an office environment: Conference rooms, lobbies 0.12 cfm/ft 2: 0.60 L/s/m 2: Spaces where space contamination is significantly higher than an office environment: Classrooms, museums 0.18 cfm/ft 2: 0.90 L/s/m 2: Spaces where space contamination is even higher than the previous category
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