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Recent content by gopher6

  1. gopher6

    Electric Air Heater Sizing for Tunnel

    I'm working on a tunneling project and trying to determine if we have rented an adequate size heater to raise the air temperature in the work area from 20 degrees F to 50 degrees F. The work area is an open top, vertical shaft bored through rock - 63 feet diameter by 250 feet deep. We have a...
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