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Table 4 - Category I Horizontal Venting Requirements
Vent Maximum Number Maximum Horizontal Minimum Extension
Unit Diameter Elbows Vent Length Vertical Rise Distance
Size (in) * (Ft.) (In.) from Wall
30 4 1 4 12 36
4181836
4241236
4281836
45 4 1 10 18 36
4251836
5 2 10 12 36
60 5 2 10 12 36
75 5 2 10 24 36
90 5 1 10 24 24
5 2 10 36 24
*
One elbow is required to make the vertical extension, See Figure 13.
Figure 13 - Category I Horizontal Venting Requirements
D-06838A