General Information A poor installation of vent tubing is the chief cause for the lack of air at the workplace T ubing installation must be performed correctly to achieve the best results and minimize costs Typical Installation Errors The following illustrates typical mistakes made in installation In all cases these errors will cause great pressure drops in the system and lead to higher energy costs 1 Messenger cable installed following the back rather that a straight line for 50 with intermediate supports as required 2 Bending a flexible tube at an angle greater than 10 degrees Always use the elbow sections ranging from 15 to 90 degrees 3 The tubing run is impeded by water or compressed air piping to prevent any change in the crosssection area of the tubing 4 Improper connection of tubing to fan or steel duct changing tubing diameter without proper reducer 5 T ube leakage will reduce the amount of air available ie a 10 cut in tubing 1000 CFM leakage This ef fect is increased closer to the fan ROCVENT INC MINE TUNNEL VENTILATION 24 wwwrocventcom