The work performed in this program was based on prior efforts using induction (jet) fans to ventilate dead headings with the objective of refining the attachments to maximize fan effectiveness and to study the influence on the effectiveness of fan proximity to drift walls. Detailed anemometer surveys were designed to delineate the size and shape of the jet created by an induction fan, and tracer gas was used to determine the quality of fresh air that an induction fan can deliver to the face of a drift and the fan's effectiveness in removing contaminants from the drift. Fan locations of 2 and 4 feet from the drift wall and at the drift center line were evaluated in the laboratory and all mine testing was done with the fan as close to the wall as possible. It was concluded that (1) an aerodynamic nozzle increases jet penetration and any tubing length up to 15 feet, (2) locating the fan near the drift wall increases jet penetration, (3) airflow straighteners are ineffective in increasing penetration, and (4) induction fan installations in general are ineffective in removing contaminants from dead headings without sufficient main ventilation flow.
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