Finned copper tube gas boilers & water heaters – Boiler Manual
7
Figure 1
Hoizontal Air Intake an Venting for a Single Direct Vent System (Category IV)
Figure 2
Horizontal Air Intake and Venting for Multiple Direct Vent Systems (Category IV)
When running horizontal combustion air and venting for
single or multiple units, exhaust and combustion air ter-
minals must be installed on the same plane (outside wall)
in order to prevent pressure differences due to prevailing
winds. In cold climates, double-wall or insulated inlet pipe
recommended to prevent condensation.
5 FT 1.5 m
1.5 FT 0.5 m
2 IN. 5.0 cm
4001 & LARGER
2001 TO 4000
1001 TO 2000
500 TO 1000
MBH
FT m
15 4.6
20 6.1
5 1.5
10 3.1
kW
146 TO 293
293 TO 586
586 TO 1172
1172 & LARGER
16 FT 4.9 m
1/4 IN. PER FOOT
20 mm/m
1.5 FT 0.5 m
1000 BTU'S
16 FT 4.9 m
1/4 IN. PER FOOT
20 mm/m
1.5 FT 0.5 m
1000 BTU'S
