Common B Vent Sizing for 2 Natural Gas Appliances 

Designing a B Vent System for 2 Natural Gas Water Heaters.
we go through the Vent Tables and the 75% rule for B Vent with a single wall vent connector.
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Time Codes
0:00 Intro
1:18 Description
5:31 802.10.7 Length of Vent Connector and 75% Code, Table 803.2.1 Vent Connector max Length
8:33 Vent Table for Two or More Appliances
12:29 Vent Table for Single Appliance
17:18 Vent Termination Codes
19:14 Closing Statement