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Residential gas appliance venting

Question asked by japlumbing38 on Sep 29, 2017
Latest reply on Sep 29, 2017 by cdafd

My question is this, in a residential home two gas appliance common vented into a single chimney, one a 39 k btu water heater and one a 100 k btu gas boiler ...they are vented via a common manifold, so knowing smaller is always over the larger is it also reguired to vent the smaller btu appliance ahead of the larger one.  In other words closer to the chimney ...I am having a discussion with someone but can't seem to find where in nfpa that is....or does it fall under the smaller over the larger...thank you #