Raypak X94 Installation & Operating Instructions Manual page 21

The maximum and minimum venting length for this Category IV appliance shall be determined per the NFGC
(U.S.) or B149 (Canada).
Certified Vent
Model Material (UL 1738
No. or ULC-S636)
Stainless Steel, AL29-
4C,
ANSI/ASTM D1785
Sch 40 PVC,
410
ANSI/ASTM F441
Sch 40 CPVC,
DuraVent
Polypropylene**
* Subtract 10' (3.05 m) per elbow. Max. 4 elbows.
** Only Duravent polypropylene is approved for the X94 Professional.
The connection from the appliance vent to the stack
must be as direct as possible and shall be the same
diameter as the vent outlet. The horizontal breaching
of a vent must have an upward slope of not less than
1/4" (6.35 mm) per linear foot from the heater to the
vent terminal. The horizontal portions of the vent shall
also be supported for the design and weight of the
material employed to maintain clearances and to pre-
vent physical damage or separation of joints.
NOTE: A vent adapter (field-supplied) may be
required to connect the Category IV vent to the
heater. The supplied vent adapter allows for direct
connection to DuraVent PolyPro, Duravent FasN
Seal, Sch 40 PVC and Sch 40 CPVC.
Termination
The vent terminal should be vertical and should termi-
nate outside the building at least 3' (0.91 m) above the
highest point where it passes through the roof and 2'
(0.61 m) above the highest point of the roof or building
that is within 10' (3.05 m) horizontally. The vent cap
Model
Size
No.
410 4"
*Must be ULC-S636 materials in Canada.
Vent and
Intake Air
Size
4"
Table 5: Category IV Vent Requirements
Approved Intakes
PVC 90° Elbow, Sch 40
Galvanized 90° Elbow,
SS 90° Elbow, ABS 90° Elbow
Table 6: Horizontal Vent and Air Intake Terminals
Vent Length
Min. Max.
5' 65'
(1.52 m) (19.81 m)
should have a minimum clearance of 4' (1.22 m) hori-
zontally from and in no case above or below (unless a
4' (1.22 m) horzontal distance is maintained) electric
meters, gas meters, regulators and relief equipment.
The distance of the vent terminal from adjacent public
walkways, adjacent buildings, open windows and
building openings must be consistent with the NFGC
(U.S.) or B149 (Canada).
flashing and extending above the roof more than 5 ft
should be securely guyed or braced to withstand snow
and wind loads.
NOTE: When using PVC Tee vent as termination,
insert the round stainless mesh screens provided
with the unit into the tee ends.
Approved Plastic
Terminals
4" PVC/CPVC Tee Sch
40*
21
Combustion
Intake Air
Air Intake
Max. Length*
Pipe Material
Galvanized
Steel, PVC, ABS,
CPVC (19.81 m)
Vents supported only by
Approved SS
Terminals
FasNSeal FSTT4
65'