Rinnai Demand Duo R Series Installation And Operation Manual page 24

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Verify proper clearances around the vents.
Ensure that the Combustion Air Requirements are followed that will provide sufficient combustion air
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for the appliance.
Ensure you have used the correct venting products for Category 1 and that you have completely
followed the venting manufacturer's installation instructions and these installation instructions. All
installations must be vented in accordance with National Fuel Gas Code NFPA 54/ANSI Z223.1 -
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latest edition and the requirements of state or local codes. In Canada, the furnaces must be vented
in accordance with the National Standard of Canada and CAN/CSA B149.1 - latest editions and
amendments and the codes of the local utility or other authority having jurisdiction.
All horizontal vent runs must be sloped up away from the water heater a minimum of 1/4 in. (6 mm)
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per foot.
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Verify that the vent termination clearances are followed.
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Verify that there is adequate combustion air.
Demand Duo™ R-Series Installation and Operation Manual 24