CONNECTOR DRAFT HOOD B VENT 7" HART & COOLEY (4) In this case, an RDH draft hood connector and/or short length of RP pipe is used to connect the appliance to an RT tee, which is capped off on the bottom and supported. The vertical vent is then erected from the tee, using straight lengths of RP pipe. These lengths of pipe should be securely locked together and positioned with RWB wall brackets to MAINTAIN 1-INCH MINIMUM CLEARANCE TO COMBUSTIBLE