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9
VI Venting
There are three basic ways to vent the BWF boiler:
• Horizontal (“side wall”) venting using an approved AL29-4C stainless steel vent system.
• Vertical venting using an approved AL29-4C stainless steel vent system.
• Chimney venting using a masonry or “B” vent chimney and a special Category I Vent Kit available from Crown.
Table 3 summarizes these three venting options. One of the columns in Table 3 must describe the planned vent system exactly
.
The following instructions describe the design and installation of Horizontal and Vertical Direct Exhaust (Category III)
systems only. Instructions for Chimney (Category I) venting are provided with the Crown Category I vent kit or are available
from Crown.
WARNING
DO NOT ATTEMPT TO VENT A BWF SERIES BOILER INTO A MASONRY OR “B”
VENT CHIMNEY WITHOUT THE CROWN CATEGORY I VENT KIT SHOWN IN
TABLE III
STRUCTURE PENETRATION WALL ROOF ROOF
MAXIMUM LENGTH:
BWF061 - BWF162 45 FT + 1 EL 39.5 FT + 2 ELS
BWF195,BWF229 (using 4" Pipe) 45 FT + 1 EL 37 FT + 2 ELS
BWF195,BWF229 (using 3" Pipe) 30 FT + 1 EL 24.5 FT + 2 ELS
MINIMUM LENGTH:
BWF061 - BWF162 2 FT + 1 EL 6 FT + 2 ELS
BWF195,BWF229 2 FT + 1 EL 6 FT + 2 ELS
NOMINAL DIA.:
BWF061 - BWF162 3" 3"
BWF195,BWF229 3" or 4" 3" or 4"
BWF061 - BWF162
BWF195,BWF229 (using 4" Pipe)
BWF195,BWF229 (using 3" Pipe)
90 ELBOW OR
TEE
CATEGORY I VENT KIT:
BWF061 - BWF128 CROWN # 650140
BWF162 - BWF229 CROWN # 650141
LISTED CHIMNEY CAP
EXHAUST TERMINAL:
90 ELBOW, TEE,
OR VH-1 TERM. BY VENT MFR.
(TABLE 6)
(*) FLEX-L-INTL STAR-34 , ZFLEX SVE SERIES III, HEAT FAB SAF-T VENT ,
PROTECH SYSTEMS FASNSEAL
NATL. FUEL GAS CODE
CLASSIFICATION
CATEGORY III CATEGORY III
MATERIAL AL29-4C(*) AL29-4C(*)
TABLE 3: SUMMARY OF VENTING OPTIONS
N/A N/A
SIZE PER NATIONAL
FUEL GAS CODE
VENTING TABLES FOR
FAN ASSISTED
APPLIANCE
"B" VENT OR LINED
MASONRY CHIMNEY
(SEE N.F.G.C.)
CHIMNEY VENT
VERTICAL DIRECT
EXHAUST
HORIZONTAL
DIRECT
EXHAUST
CATEGORY I
CLASSIFICATION USED IN THIS
MANUAL