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The vent connector pipe between the furnace and chimney shall be of equal diameter as the flue outlet of the
furnace. The vent connector pipe must be made of 24 gauge (or thicker) corrosion-resistant steel.
The
vent connector pipe should be as short as possible and installed so that it has a continuous rise from the
furnace to the chimney. The horizontal length of a connector to a natural draft chimney or vent serving a single
appliance shall not be more than 75 percent of the height of the vertical portion of the chimney or vent above
the connector. Elbows should be minimized and the pipe should be joined with metal screws and supported by
straps. All horizontal runs of vent connector pipe should be pitched upward a minimum of ¼ inch per foot of run.
A thimble should be used to connect the vent connector pipe to the chimney so the pipe may be readily
removed in case of inspection or replacement. See Fig. 6 on preceding page.
B. VENTING:
NOTE: On the OH6 & OH8 it is possible to rotate the flue elbow (which is factory installed for vertical
discharge) 90°
counter clockwise from the vertical position to adapt to various venting systems. The OH8
flue elbow can also be rotated 90°
clockwise.
Notice:
Blocked Vent Switch Installation
The blocked vent switch kit must be installed to comply with CAN STD B140.4 where applicable. For
installation instructions see AOPS2687 kit.
χ CAUTION MUST BE TAKEN NOT TO EXCEED 90° ROTATION (OF THE FLUE
ELBOW) .
ROTATION OF FRONT FLUE ELBOW:
When an installation requires that the flue exit out the left or right (OH8 only) side casing, remove screw
securing the 90 deg. elbow and rotate it 90°. Then, remove knock-out in side casing and extend vent
through the opening.
A trim collar may be ordered from Thermo Products to hide the gap around the flue pipe. This trim collar,
however, is not required for operation. Trim collar/gasket part numbers(s) 14121 / 330073 for OH6 and
14132 / 330006 for OH8.
The OH6 & OH8 may be vented through a standard correctly sized chimney.
The OH6 & OH8 may also be horizontally vented through a sidewall. Thermo Products has available the
Field model FDVS-45/FOVP-415 and FDVS-67/FOVP-615 side wall vent kits for such applications. When
installing the sidewall vent kits, outside combustion air must also be applied to the burner. The following
table identifies application order information.
Table 2: Sidewall vent kits
The Field vent kit is set up with 4 inch diameter vent pipe for OH6 and 6 inch diameter vent pipe for the
OH8 with concentric through-the-wall vent termination/inlet air vent hood. The combustion air inlet pipe
diameter is also 4 inch diameter. For Riello, the combustion air inlet pipe will be reduced to 3 inch
diameter with the Riello sidewall vent kit. For Beckett, the combustion air inlet pipe will be reduced to 3”
diameter with the Beckett sidewall vent kit.
FIELD VENT TERMINATION
KIT
SIDE WALL VENT
A
CCESSORIES KIT
COMBUSTION AIR INTAKE
HOOD KIT
(15’ application MAX) (BURNER SPECIFIC)
(FOR COMBUSTION AIR
A
PPLICATIONS ONLY
)
THERMO PRODUCTS PART
NUMBER
THERMO PRODUCTS
PART NUMBER
THERMO PRODUCTS PART
NUMBER
(OH6) (OH8)
Beckett AFG AOPS8393 AOPS8414 AOPS8394 AOPS8397
Riello BF3 AOPS8393 AOPS8414 AOPS8395 AOPS8416
Beckett NX
(OH6 ONLY)
AOPS8393 N/A AOPS8412 AOPS8413
BURNER
SIDE WALL VENTING APPLICATION ORDER INFORMATION