BIS TRADITION - Chimney Chase and Multiple Terminations

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4.6 CHIMNEY CHASE AND MULTIPLE TERMINATIONS
For the purpose of this manual, a chimney chase is considered a part of the chimney
system rather than part of a building. The termination must be placed a minimum of 18"
(460 mm) above the chase.
For installations where more than one chimney is located in the same chase or within the
same area, we suggest that their terminations be separated by at least 16" (410 mm)
horizontally, and 18" (460 mm) vertically. This separation is to prevent smoke migrating
from one chimney to another (see figure 36).
Figure 36