Specifications

FLUEING
35
Horizontal Flueing – Extended Flue Run
Notes:
Ensure each flue component is fully engaged and the rubber seal on the inner duct is well seated at
each joint.
Each flue component is supplied with screws to connect to the adjacent flue component. The screws are
located in a bag taped to the outside of the flue component.
Refer to diagrams:
 “Typical Installation – Horizontal Terminal with One Bend” on page 31, and
 “Typical Installation – Horizontal Terminal with Multiple Vertical and Horizontal Sections” on
page 32.
To install an extended horizontal flue and termination:
1. Install the water heater in its final location.
2. Connect the 90° Bend (PN 295118) to the water heater flue outlet and rotate in the desired direction of
discharge, if the flue is not to have a change of direction from horizontal to vertical.
 Fit the end of the bend down over the water heater flue outlet as far as it will go.
Ensure there is a minimum 35 mm and maximum 42 mm overlap, the rubber seal on the inner flue
is well seated and the bend is fully engaged on the water heater flue outlet.
 Secure the bend to the outlet with the screws provided.
3. Mark the location where the top of the flue is to penetrate the wall to outside of the building.
If the flue is not to have a change of direction from horizontal to vertical, then to accurately mark this
position:
 Measure the vertical distance from the floor to
the top of the 90° Bend, and
 Measure the horizontal distance from the wall
behind the water heater to the centre of the
90° Bend, and
 Then, where the flue is expected to penetrate
the wall, mark the vertical distance up from the
floor and the horizontal distance out from the
wall measured from the previous steps.
Note: If the flue is to have an additional one or two horizontal changes of direction, then it is not
necessary to measure or mark the horizontal distance from the wall behind the water heater to the
centre of the 90° Bend.
 Alternatively, using a level, run from the top of the 90° Bend to a location horizontal on the wall
where the flue will penetrate and mark this point on the wall
 Measure the horizontal distance, along the proposed flue route, from the end of the 90° Bend to the
where the flue is to penetrate the wall.
Divide this measurement by 50 to calculate the vertical distance fall of the flue (allowing for a 1 in 50
fall).
 Measure this distance down from the previous mark placed on the wall.
This point will be the top of the flue termination hole and the flue will have a gradient of 20 mm per
metre of length towards the terminal.
Note: Ensure there are no studs, noggins, pipes or electrical cables located in the wall where the flue is
to penetrate