Z-Vent 4" Horizontal Tankless Vent Kit & Sealed Room Fresh Air Intake

Is the room fairly small where your 4" exhaust tankless water heater is to be installed? Does the room lack sufficient supply of fresh air? Then you must use a vent kit like this one that brings fresh air into the tankless unit or room. Components qty. one 4" diameter termination hoodqty. one 4" diameter 90 degree elbowqty. one 4" diameter 1' length pipeqty. one 4" diameter wall thimbleqty. one 4" diameter Universal Appliance Adapter ("UAA")qty. one 3" diameter galvanized steel fresh air intake hoodqty. one 3" diameter 5' length combustion air duct with clamps (aluminum flex duct pipe) Note: This kit does not include a condensate drain pipe which may be required depending on your water heater manual guidelines and building code. • Replace the UAA in this kit with this item if you want to add a backflow preventer and condensate drain. • Or, this gadget with only the condensate drain can be connected to the UAA in this kit. • Vent material: AL29-4C stainless steel, except for the fresh