Page 861 - 2018_IRC

APPENDIX B

Example: Manifolded Common Vent Connector L M shall be no greater than
18 times the common vent connector manifold inside diameter; i.e., a 4-inch
(102 mm) inside diameter common vent connector manifold shall not exceed Vent connector size depends on: Common vent size depends on:
72 inches (1829 mm) in length (see Section 504.3.4). • Input• Combined inputs
• Rise• Available total height “H”
Note: This is an illustration of a typical manifolded vent connector. Different • Available total height “H”• Table 504.3(1) common vent
appliance, vent connector, or common vent types are possible. Consult • Table 504.3(1) connectors
Section 502.3.
FIGURE B-13
FIGURE B-11 MULTISTORY GAS VENT DESIGN PROCEDURE
USE OF MANIFOLD COMMON VENT CONNECTOR FOR EACH SEGMENT OF SYSTEM

Example: Offset Common Vent
Note: This is an illustration of a typical offset vent. Different appliance, vent Principles of design of multistory vents using vent connector and common
connector, or vent types are possible. Consult Sections 504.2 and 504.3. vent design tables (see Sections 504.3.11 through 504.3.17).
FIGURE B-12 FIGURE B-14
USE OF OFFSET COMMON VENT MULTISTORY VENT SYSTEMS

836 2018 INTERNATIONAL RESIDENTIAL CODE ®
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