Z-Flex 4” Z-Vent Horizontal Vent Kit w/ Backflow Preventer

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The 2ZVWB04 from Z-Flex is a 4” Z-Vent Horizontal Vent Kit w/ Backflow Preventer. This kit provides a simple, all-in-one solution for installation of a tankless water heater in typical, in-room combustion application. Such installation is typical for garages, basements and other areas with access of fresh air.

In-room combustion refers to the installation method, where TWH's exhaust gases must be vented through the outside wall (usually the one the unit is mounted on), while the intake (fresh air supply) is obtained from the room where the unit is installed. It is important to make sure that there's a constant supply of fresh air to the installed area, such as a window.

This Kit includes all major components for installation of a Takagi tankless water heater with horizonal venting through an outside wall (with thickness of 4-7"):

(1) Z-Vent Termination Hood;
(1) 4" Z-Vent 90° Elbow;
(1) 4" x 1.5ft Z-Vent pipe;
(1) 4" x 1ft Z-Vent pipe;
(1) Z-Vent Wall Thimble (4-7" adjustable);\
(1) Takagi Flue Outlet x Z-Vent Pipe Adapter with Built-in Backflow Preventer;

Order of assembly (starting from the tankless water heater's 4" flue outlet):

1. Appliance adapter with backflow preventer (Takagi x Z-Vent)
2. 1.5ft pipe
3. Elbow
4. 1ft pipe
5. Wall thimble
6. Termination hood