Sterling TUBULAR GAS FIRED DIRECT SPARK PROPELLER UNIT HEATERS GG-30 - Manual (Page 19)

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Table 5 - Category I Horizontal Venting Requirements - Standard Combustion
Vent Maximum Number Maximum Horizontal Minimum Extension
Unit Diameter Elbows Vent Length Vertical Rise Distance
Size (in) * (Ft.) (In.) from Wall (In.)
30 4 1 5 8 36
4 2 10 18 36
45 4 1 10 24 36
4 1 15 24 36
4 2 5 24 36
60 4 2 10 18 36
75 5 2 7 24 36
90 5 2 7 24 24
105 5 2 7 24 24
120 5 1 5 24 24
5 2 7 24 24
*One elbow is required to make the vertical extension, See Figure 13.
Figure 13 - Category I Horizontal Venting Requirements
D6838C