UHA S
TANDARD
U
NIT
H
EATER
I
NSTALLATION
O
PERATION AND
S
ERVICE
M
ANUAL
14 of 59
Figure 7: Standard Vented Heater - Common Vertical Vent Termination
Requirements:
• Maximum of four heaters can be commonly vented through the roof.
• Heaters must be of the same BTU output.
• Heaters must be controlled by a common thermostat.
• Connections to a common stack must be positioned to avoid direct opposition between streams of
combustion gases.
Roof
2'(.6 m)
Minimum
Type "B" vent cap
(7" [18 cm] or 8" [20 cm]) may be
used. (These are not available
from the manufacurer.)
Roof
Flashing
Approved
Thimble
(If Applicable)
Type "B" Vent Pipe
4" (10 cm)
Single Wall Pipe
4" (10 cm)
Single Wall Pipe
"D" Area must equal sum
of open area of
individual vents.
"D"
Single Wall Pipe
The last section of vent pipe passing
through the roof or wall may be Type
"B" vent pipe. All other vent materials
in the building must be single wall
vent pipe.
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SIDE VIEW
Summary of Contents for UHAT 150
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Page 50: ...UHA STANDARD UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 42 of 59 14 1 General...
Page 65: ...SECTION 16 SPECIFICATIONS 57 of 59 16 4 Dimension Data for Models UHA T M X S 300 400...
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