Outer Jacket Support Clamp - For use on horizontal systems to provide support at the required 6-foot intervals. May be used singly as a saddle to rest the vent in and hung from two rods or cables. Use in pairs by clamping around the outer jacket and suspend from a single rod or cable. Support clamps by themselves do not maintain the necessary clearances to combustible materials; be sure to consider clearances and proper pitch when planning the system. Support clamps are sold in pairs, with two half-shells and two ¼-20 nuts and bolts. Never drill or screw through the Saf-T Vent SC inner vent conduit.