American Energy Systems Catalytic BBF - Manual (Page 62)

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FIGURE 40: EXTERIOR CHIMNEY SYSTEM
FIGURE 41: EXTERIOR CHIMNEY SYSTEM
For the purpose of this manual, a chimney chase is considered a part of the chimney system rather than part of a building.
The chimney termination must be placed a minimum of eighteen inches or four hundred and sixty millimeters above the
chase.
For installations where more than one chimney is located in the same chase or within the same area, it is recommended
that each chimney termination be separated by at least sixteen inches or four hundred and ten millimeters from the next
chimney and each chimney termination be placed a minimum of eighteen inches or four hundred and sixty millimeters
above the chase. These separations are required to prevent smoke from migrating from one chimney to another. FIGURE
40 shows an example of the required chimney multiple termination dimensions.