Venting - Space-Ray FUSION Series Installation & Operation Instructions

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VENTING

This is a category lll appliance.
A. BASIC FLUE VENTING — Venting must comply with the latest edition of the National Fuel Gas Code (ANSI
Z223.1-latest edition) or the authority having jurisdiction. Other venting references are in the equipment
volume of the ASHRAE Handbook.
Model exchanger
length ft
FUS 60, 70
FUS 60, 70, 80
FUS 90
Note:
1. Vent lengths shown in the table are for horizontal and vertical venting. If a longer length of vertical or
horizontal venting is required contact the manufacturer for assistance with vent sizing.
2. Vent cannot be used with the Cold air stopper accessory.
3. Cold air stopper is only for use with fresh air intake assembly PN 44129500.
SINGLE HEATER VENTING
1. When venting the heater to outside of building through a roof, use single-wall metal pipe. This is to be
constructed of galvanized sheet metal or other approved noncombustible corrosion-resistant material as
allowed by state or local codes.
2. A vent passing through a combustible roof shall extend through an approved clearance roof thimble. Double-
wall, Type B vent must be used for the portion of the vent system which passes through the combustible roof.
An approved vent cap must be attached to end of the flue.
3. The maximum equivalent length of vent pipe should be carefully observed. A safety switch in the heater is
designed to shut the heater off before excessive flue restriction causes bad combustion. Refer to the Vent
Sizing Table for maximum vent lengths and vent pipe diameter.
4. Joints between sections of piping shall be fastened by sheet metal screws or other approved means and
should be sealed to prevent leakage of flue gas into building. Aluminum tape rated for 550ºF (3M Company
tapes 433 or 363) or silicone sealant is recommended.
5. All portions of the vent pipe shall be supported to prevent from sagging (6' spacing is recommended).
6. When the vent pipe passes through areas where the ambient temperature is likely to induce condensation of
the flue gases, the vent pipe should be insulated and a condensation drain should be provided.
7. Minimum clearance for single-wall flue pipe to combustible material shall be 6 inches. This may be reduced
when the combustible material is protected as specified in the National Fuel Gas Code or the authority having
jurisdiction.
8. Single-wall metal pipe shall not originate in any unoccupied attic or concealed space and shall not pass
through any attic, inside wall or concealed space, or through any floor. For the installation of a single-wall
metal pipe through an exterior combustible wall, refer to latest edition of the National Fuel Gas Code or the
authority having jurisdiction.
9. A venting system shall terminate at least 3 ft. above any forced air inlet located within 10 ft.
Form 43343100
April 2022 A
Heat
Maximum vent length ft.
(4" diameter)
15 45
20 45
20 UNVENTED ONLY
(VERTICAL THROUGH THE ROOF)
Maximum Fresh air
intake length ft (4"
diameter)
50
50
50
-37-
Max. combination of
fresh air and vent ft.
(4" diameter)
75
75
UNVENTED ONLY