John Wood Superflue Power Vent (before FVIR technology) - Manual (Page 7)

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TERMINATION MAY BE
90 DEGREE ELBOW
OR A “T” ELBOW
3” MIN. LENGTH
ROOF
LINE
18”
VERTICAL VENTING
(MUST BE SUPPORTED EVERY 8’)
A vent used in a SPECIAL VENTING SYSTEM with positive vent
pressure and passing through a roof shall extend at least 18
inches (450 mm) above the highest point where it passes through
the roof surface and any other obstruction within a horizontal dis-
tance of 18 inches (450 mm)
Figure 3 - 2
STREET ELBOW
BACK TO BACK ELBOWS
NORMAL ELBOW
PREFERRED PRACTICE
Figure 4
6” min.
(152 mm)
2) VENT CONNECTIONS TO THE WATER
HEATER
IMPORTANT GUIDELINES
These venting guidelines are good, recommended
practice for venting installations. Applicable local codes
supersede this set of venting guidelines. See Figure 4.
1. The length and number of the 90 degree elbows
must be kept to a minimum.
2. No back-to-back 90 degree elbows should be
used.
3. 45 degree elbow should be used where possible to
minimize the number of 90 degree elbows in case
re-direction of flue gas are required.
4. Do not use short radius elbows.
5. No female-male (Street nineties) should be used.
6. Pipe must be cut at a right angle.
7. Deburr cut pipe outside and inside so that solvent
cement is not pushed away by sharp edges.
8. Dry fit all pipes and fittings before joining the parts
with solvent cement.
9. Parts must fit well without putting stress on any sec-
tions.
Refer to Table VI for maximum and minimum vent
length. Construct vent pipes connecting to the water
heater. Horizontal runs may slope in any direction as
long as a water trap is not created in the venting sys-
tem. The horizontal runs must not sag or form valleys
where condensation might collect. To avoid this situa-
tion, provide support for the runs at a maximum 4 feet.
All Power Vented water heaters generate a certain
amount of operational noise. In order to minimize noise
transmission to floor joists though hangers, place some
soft material such as foam rubber, approximately 1/2”
thick, between hangers and the vent pipes. Ensure that
all vent components fit properly. Apply solvent cement
and join all parts permanently.
Apply solvent cement to join the termination assembly
to the venting system inside the building. Seal around
the vent terminal where it passes through the wall,
inside and out with silicone sealant caulking. Proceed
to attach the venting system to the rubber coupling of
the water heater.
CAUTION
Use of Solvent Cement and Primer:
Use only in well-ventilated areas. Do not
use near flame or open fire. Solvent
cements for plastic pipe are flammable liq-
uids and must be kept away from all
sources of ignition.