Rheem 864 Series Owner's Manual And Installation Instructions page 66

FLUEING
HORIZONTAL FLUE INSTALLATION
Horizontal Flueing – Directly Behind Water Heater
This method of flue installation is used where the secondary flue is to penetrate and terminate immediately
behind the wall on which the water heater is mounted.
Do not plumb the water heater prior to this type of flue installation, as the water heater (if mounted) requires
to be removed from the wall prior to the final installation of the flue.
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.
To install a horizontal flue and termination directly behind the water heater:
Carefully remove the template inserted as the middle pages of this installation instructions booklet.
1.
Align the mounting bracket holes on the template exactly over
2.
the upper wall mounting bracket holes on the water heater.
This step presumes the water heater is hung on the wall.

It may be convenient to tape the template to the wall.
Note: Ensure there are no studs, noggins, pipes or electrical
cables located in the wall where the flue is to penetrate
3. Mark the pilot hole location through the centre of the template.

Remove but DO NOT DISCARD the template.
4. Remove the water heater from the wall.
Note: It is necessary to remove the water heater from the wall to
allow the fitting and installation of the flue. It is also good practice
so no debris from the drilling operation enters the water heater
flue outlet.
Drill a pilot hole using a 6.5 mm diameter or smaller drill bit.
5.
The drill bit must be long enough to penetrate completely through the outer skin of the external wall.
Note: Ensure the drill remains level and straight during this step.
Cut along the middle of the bold circle marked "Cut Line" on the template.
6.
7. Align the centre of the template with the pilot hole on the wall surface and scribe around the template onto
the wall.
The circle should be 150 mm in diameter.

Remove but DO NOT DISCARD the template.
Align the centre of the template with the pilot hole on the outside wall surface and scribe around the
8.
template onto the wall.
The circle should be 150 mm in diameter.

Remove the template.
Drill or cut the flue termination hole through the wall using a cutting tool suitable for the wall construction.
9.
Note: The Trim Ring (PN 295125) will cover a 150 mm diameter hole.
66
position template