Raypak 259 Installation & Operating Instructions Manual - page 19
19
Canadian Installations
Refer to latest edition of the B149 Installation code.
A vent shall not terminate:
1. Directly above a paved sidewalk or driveway
which is located between two single-family dwell-
ings and serves both dwellings.
2. Less than 7 ft (2.13 m) above a paved sidewalk or
paved driveway located on public property.
3. Within 6 ft (1.8 m) of a mechanical air supply inlet
to any building.
4. Above a meter/regulator assembly within 3 ft (915
mm) horizontally of the vertical centre-line of the
regulator.
5. Within 3 ft (0.9 m) of any gas service regulator
vent outlet.
6. Less than 1 ft (305 mm) above grade level.
7. Within the 3 ft (915 mm) of a window or door which
can be opened in any building, any non-mechani-
cal air supply inlet to any building or the combus-
tion air inlet of any other appliance.
8. Underneath a verandah, porch or deck, unless the
verandah, porch or deck is fully open on a mini-
mum of two sides beneath the floor, and the dis-
tance between the top of the vent termination and
the underside of the verandah, porch or deck is
greater than 1 ft (305 mm).
Venting Installation Tips
Support piping:
•
horizontal runs—at least every 5 ft
•
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.
Natural Draft Vertical Venting
(Category I) Fan-Assisted
Installation
Natural draft venting uses the natural tendency of the
heated flue gases to rise, until they are expelled from
the top of the flue. The negative draft must be within
the range of -.01 to -.08 in. WC as measured 12 in.
above the appliance flue outlet to ensure proper oper-
ation. Vent material must be listed by a nationally rec-
ognized test agency.
Double-wall Type B vent must be used to promote
draft and to minimize condensation in the vent.
No drafthood is required or offered. A single acting
barometric damper is recommended if the height
exceeds 25 feet. Consult the factory for additional
information.
WARNING: Examine the venting system at least
once a year. Check all joints and vent pipe
connections for tightness, corrosion or deterioration.
Category I Vertical Venting
1
Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further
details. When vertical height exceeds 25 ft, consult factory prior to installation.
* Subtract 10 ft per elbow. Max. 4 elbows.
** Schedule 40 in PVC or CPVC
Model
No.
Certified
Vent
Material
Vent Size
(in.)
Vertical Vent
Height
1
(ft)
Combustion Air
Intake Pipe
Material**
Air Inlet
Max. Length*
(ft)
4” Ø
Min.
Max.
259
Category I
(Type B
Equivalent)
6
5
25
Galvanized Steel,
PVC,
ABS,
CPVC
80
409