Custom Field Cut Vent Tubing Installation Required 15 of tubing from last installed section of tubing to lateral fitting 1 Cut of f 8 0 of tubing from inlet end of tubing leaving 17 0 2 Fold back cutof f end 2 times making 4 thicknesses 3 Punch holes through material to line up with hooks of last installed section of tubing 4 Inset cuf f of last installed section of tubing connect snaps ROCVENT INC MINE TUNNEL VENTILATION 30 wwwrocventcom