Crown Boiler BWF Series Installation Instructions Manual page 12

6. Vent System Design (continued)
Table 6.1: Summary Of Venting Options Using Indoor Combustion Air
Classification Used in this Manual
Vent Option #
Illustrated in Figure
Structure Penetration
Material
Nominal Diameter (inches)
BWF063 - 175
Maximum
BWF189, 210
Vent Length
BWF220, 245
Terminal Option A
Terminal Option B
1. Tee or Cap terminal is supplied by the installer and is compatible with special gas vent system. See Table 6.7 for details.
2. Suitable for use on BWF063 - BWF175 only. Miter terminal is part #8110701 and is purchased separately. 45° Elbow is
by special gas vent manufacturer.
3. BWF189 and 210 are factory supplied with a 3" adaptor. A 3 x 4 increaser compatible with the special gas vent system is required
when these models are vented using 4" pipe. When used, this increaser must be the first fitting installed on the boiler adaptor.
NOTICE: Do not exceed maximum vent/combustion air system length. Refer to Table 6.1 in this section for
maximum vent system length. Use only vent terminals and terminal locations shown in Tables 6.1, and 6.6 and
related Figures in this section.
4. Horizontal Vent Terminal Location - Observe
the following limitations on the vent terminal
location (also see Figure 6.9):
• Terminal must be at least 4 feet below or
4 feet horizontally from any operable
window, door, or gravity air inlet into the
building.
• The bottom of the terminal must be at least
12" above the normal snow line. In no
case should it be less than 12" above
grade level.
• Do not locate the vent terminal over a
public walkway.
• The bottom of the terminal must be
at least 3 feet above any forced air inlet
located within 10 feet.
• USA Only: A clearance of at least 4 feet
horizontally must be maintained between
the vent terminal and gas meters, electric
meters, regulators, and relief equipment.
Do not install vent terminal over this
equipment. In Canada, refer to B149.1
Installation Code for clearance to meters,
12
(See Appendix A for Options Using Outdoor Air)
Horizontal Direct Exhaust
1
6.2
Wall
Listed AL29-4C Stainless Special Gas Vent System (See Table 6.7)
3
50 ft
15 ft
Not Permitted
3" Tee
1
Miter + 45 Elbow
2
2
6.2
Wall Roof
4
3
Not Permitted
50 ft
40 ft Not Permitted
4" Tee 3" Cap
1
Not Permitted Not Permitted
regulators and relief equipment.
• Do not locate the terminal under decks or
similar structures.
• Top of terminal must be at least 4 feet
below eves, soffits, or overhangs.
Overhang may not exceed 3 feet
(Figure 6.7).
• Terminal must be at least 3 feet from an
inside corner.
• Under certain conditions, water in the
flue gas may condense on the structure
in areas around the terminal. If these areas
are made of materials subject to damage
from flue gas condensate or ice, they
should be protected.
• If possible, install the terminal on a wall
away from the prevailing wind. Reliable
operation of this boiler cannot be
guaranteed if the terminal is subjected to
winds in excess of 40 mph.
• The noise level in the vicinity of the
terminal is approximately 65 dB (roughly
the level of a normal conversation). Avoid
positioning the terminal in areas where this
might be objectionable.
Vertical Direct Exhaust
3 4
6.6 6.6
Roof
3 4
50 ft Not Permitted
15 ft 50 ft
40 ft
4" Cap
1
Not Permitted
109836-01 - 04/20
1