Chimnet Venting

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I know with chimney venting the smaller item (water heater) enters the chimney above the larger item (heating unit). I need the proper paragraph for a report to support this.

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When connecting more than one gas/oil appliance to a common chimney, it is required to vent the smaller btu unit above the larger btu unit for proper draft and fan operation as well as having the proper sized chimney/vent.

http://www.ashireporter.org/HomeInspection/Articles/The-Venting-in-Common-of-Multiple-Gas-Appliances/2067

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Thank you guys.