20
Venting Installation (cont.)
The IBV, per ANSI-Z21.50 standard, requires double wall, gas only B-
Vent metal piping for the purpose of venting the appliance to the outside
of the building.
Specications:
Gas code requirements concerning B-Type vent installations may
vary within state, province or local code jurisdictions. Therefore it is
recommended that you check with local building codes prior to installing
any B-Vent piping for specic requirements or, in the absence of local
codes follow Section 7.0 of the current National Fuel Gas Code ANSI
Z223.1, NFPA 54.
1. The IBV must be vented vertically out the top of the unit.
2. All B-Vent ue used with IBV must terminate vertically through the
roof.
3. All B-Vent ue used with IBV may not be terminated into an attic
space.
4. The B-Vent ue used with IBV must only be used for the IBV and not
shared with other venting systems.
5. Maintain a minimum one inch (1”) air space at all double wall B-Vent
metal pipe components.
6. Maintain a minimum two inch (2”) air space at all single wall B-Vent
metal pipe components.
Note: Check with pipe manufacturer for specic clearance
requirements.
7. Maintain a minimum three inch (3”) air space to all insulation and
vapor barriers.
8. Minimum required chimney height is one hundred inches (100”).
(Figure 21)
9. Maximum chimney offset angle is forty-ve degrees off of vertical.
(Figure 21)
11. Only one offset per chimney system is allowed.
CAUTION: Do not modify or alter metal ue or metal ue components
as this could result in an unsafe and potentially dangerous installation
that may cause a serious injury. Consult B-Vent manufacturer.
100” minimum
45º
maximum
angle
Figure 21
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