30
Table M: Category IV Venting
1
Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further details.
2
Consult factory for longer vent runs .
* Subtract 10 ft per elbow. Max. 4 elbows.
** Adapters supplied by others.
*** Only Centrotherm polypropylene material is approved for use with the XTherm.
Model
No.
Certified
Vent
Material
Vent Size
(in.)
Total Effective
Length
1
(ft)
Combustion Air
Intake Pipe
Material
Air Inlet
Max. Length* (ft)
Min.
Max.
6” Ø
8” Ø 10” Ø
1005A
Category IV
(AL29-4C)
PVC
CPVC
Polypropylene***
6
0
75
2
Galvanized
Steel,
PVC,
ABS,
CPVC
45
100**
1505A
8
45
85**
2005A
Venting Installation Tips
Support piping:
•
horizontal runs—at least every 5 ft (1.5m)
• vertical runs—use braces
•
under or near elbows
Venting Configurations
For heaters connected to gas vents or chimneys, vent
installations shall be in accordance with the NFGC
(U.S.), or B149 (Canada), or applicable provisions of
local building codes.
Vertical Venting (Category IV)
Installation
The maximum and minimum venting length for this
Category IV appliance shall be determined per table
M.
The minimum flue pipe diameter for conventional vent-
ing using Category IV, stainless steel AL29-4C vent is:
6 in. (152mm) for Model 1005 and 8 in. (203mm) for
Models 1505 and 2005.
The connection from the appliance vent to the stack
must be as direct as possible and shall be the same di-
ameter as the vent outlet. The horizontal breaching of
a vent must have an upward slope of not less than 1/4
inch per linear foot from the heater to the vent termi-
nal. The horizontal portions of the vent shall also be
supported for the design and weight of the material
employed to maintain clearances and to prevent physi-
cal damage or separation of joints.
Termination
The vent terminal should be vertical and should termi-
nate outside the building at least 2 ft above the highest
point of the roof that is within 8 ft. The vent cap should
have a minimum clearance of 4 ft horizontally from and
in no case above or below (unless a 4 ft hori-zontal
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). Gas vents supported only by
flashing and extended above the roof more than 5 ft
should be securely guyed or braced to withstand snow
and wind loads.
WARNING:
Examine the venting system at least
once a year. Check all joints and vent pipe
connections for tightness, corrosion or deterioration.
CAUTION:
This venting system requires the
installation of a condensate drain in the vent piping
per the vent manufacturer’s instructions. Failure to
install a condensate drain in the venting system will
void all warranties on this heater. Condensate is
acidic and highly corrosive.
CAUTION:
A listed vent cap terminal suitable for
connection to the Cat IV vent materials, adequately
sized, must be used to evacuate the flue products
from the heaters. Cap design must prevent rain
water from entering stack.
NOTE:
A vent adapter (field-supplied) may be re-
quired to connect the Category IV vent to the heater.
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