CLEAN BURN CB-1400 Operator's Manual page 53

WARNING! OUTSIDE STACK AND STACK PENETRATIONS THROUGH CEILING,
ROOF, OR SIDEWALL MUST BE "CLASS A" FOR FIRE SAFETY AND TO MAINTAIN
PROPER DRAFT.
EXTERIOR SINGLE WALL STACK DOES NOT MEET FIRE CODE!
WARNING! MAKE SURE TO INSTALL ALL STACK COMPONENTS WITH PROPER
SUPPORT AND CLEARANCES FROM CONBUSTIBLES. FOLLOW STACK
MANUFACTURER'S SPECIFICATIONS.
NOTE: THE LAST STACK SECTION SHALL EXTEND AT LEAST 2 FEET (61 CM)
ABOVE THE HIGHEST POINT AT WHICH IT COMES IN CONTACT WITH THE ROOF
AND AT LEAST 2 FEET (61 CM) HIGHER THAN ANY RIDGE, PARAPET, WALL, OR
ROOF STRUCTURE WITHIN 10 FEET (3 M) OF IT.
-.02 W.C. DRAFT OVERFIRE IS
ESSENTIAL FOR PROPER FURNACE
OPERATION. SEE SECTION 8.
AIR PRESSURE LINE
OIL PRESSURE LINE
Figure 4J - Installation of "Class A" Stack Through Sidewall
Operator's Manual: Models CB-1400, CB-1800, and CB-2800
"CLASS A" STACK CAP
NON-RESTRICTIVE TYPE TO ALLOW
FREE FLOW OF THE STACK GASES
CLASS A STACK
PENETRATION
AND CLEAN-OUT
TEE
BAROMETRIC
DAMPER
SINGLE WALL STACK
MIN. 24 GAUGE
4-21