Table of Contents Material 3 V ent Duct Specification 4 Friction Chart 5 Material 6 Product Characteristics 9 Material Properties 10 Tubing 12 Overview 13 Spiral Duct 14 Duo Duct 15 V ertical Shaft T ubing 16 Coupling Systems 17 Fittings and Accessories 20 Tubing Installation 23 General Information 24 Installation Components 26 Messenger Cable Kit Installation Instructions 27 SnapRoc T ubing 29 Custom Field Cut V ent T ubing 30 T ubing Repairs 31 Other Products 32 Inflatable Headcover 33 Headcover Installation Instructions 35 Inflatable Stopping Panel 38 Fresh Air Stations 40 Strip Curtains 42 V elcro Split Curtains 43 Curtains 44 Messenger Cable Kit T ensioning T ool 45 Quick Sleeve Repair Units 46 Inflatable Stopping Panel 47 ROCVENT INC MINE TUNNEL VENTILATION 2 wwwrocventcom