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3
Install a 4" straight pipe to the NRV. Exhaust common
venting is required to have a 3° rise or a 5/8 per foot
(5.6 cm per meter) upward slope toward the outdoors.
When the water heaters are mounted with 20.5" (52
cm) center to center distance, 1" (2.5 cm) rise per water
heater is required. A 4" straight pipe included with our
common vent kit must be cut to an appropriate length
to have 1" (2.5 cm) rise per water heater. Cut pipe end
square, remove jagged edges and burrs, chamfer end
of pipe and clean the sealing gasket.
4
Install a 87° elbow to the 4" straight pipe.
5
Connect a feeder of a branch tee to the open end of
the elbow for inline installation.
20
6
Connect the branch tee to another branch tee. Repeat
steps 1 to 6 until all exhaust branch tees are connected.
7
Connect a horizontal drain fitting to the end of the
exhaust common vent trunk line.
8
Connect a ball siphon to the horizontal drain fitting.
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