e. Vertical flue stacks shall be terminated with an approved cap.
f. The maximum horizontal vent pipe length for these heaters is shown in table 1. A total equivalent horizontal vent
pipe length can be calculated using equivalent straight pipe lengths for tees and elbows reducing the maximum
horizontal vent pipe length by six feet for each sweep elbow, two and one half feet for termination tee, and ten
feet for each short radius elbow.
g. A gradually tapered vent pipe transition is required for (I)ISHRDV-100, (I)ISHRDV-125, and (I)ISHRDV-160 units
when using 4 inch vent pipe.
h. When possible, locate horizontal vent hoods that do not face the direction of prevailing winds to diminish the
possibility of back draft situations.
i. For U.S.A. standards vent systems must conform to the latest edition of the National Fuel Gas Code
(NFPA#54) and the latest edition of NFPA #211, or as follows:
·
Not less than 7 feet above grade when located adjacent to public walk ways.
·
AT least 3 feet above any forced air inlet located within 10 feet.
·
At least 4 feet below, 4 feet horizontally from or 1 foot above any door, window or gravity air inlet into any
building.
·
At least 1 foot above grade, or at least 1 foot above the normally expected snow accumulation level.
·
Directed such as to not jeopardize people.
·
At least 4 feet from electric meters,
gas meters, regulators and relief equipment.
·
Sealing or shielding of exposed surfaces with a corrosion resistant material may be required to prevent staining
or deterioration of building materials, and
·
Not less than 2 feet from an adjacent building.
j. In Canada vent systems must conform to the latest edition of the Natural gas and Propane Installation Code
(CAN/CGA-B149.1 or CAN/CGA-B149.2), or as follows:
·
A venting system shall not terminate underneath a veranda, porch, or deck, or above a paved sidewalk or a
paved driveway that is located between two buildings, and that serves both buildings.
·
The exit terminals of mechanical draft systems shall not be less than 2.14m above grade when located
adjacent to a paved sidewalk or driveway.
·
A venting system shall not direct flue gases towards brickwork, siding, or other construction, in such a manner
that may cause damage from heat or condensate from the flue gases.
·
A vent system shall not direct flue gases so as to jeopardize people, overheat combustible structures, or enter
buildings.
·
A venting system shall not terminate within 1.8m of the following:
·
A window, door or mechanical air supply inlet of any building, including soffit openings.
·
A gas service regulator vent outlet.
·
A combustion air inlet.
·
A property line.
·
A direction facing combustible materials or openings of surrounding buildings
·
A venting system shall not terminate within 1m of the following:
·
Above a gas meter/regulator assembly within 1m horizontally of the vertical centerline of the regulator.
·
An oil tank or an oil tankfill inlet.
·
The inside corner of an L-shaped structure.
·
A venting system shall not terminate within .3m of the following:
·
Above grade level or any surface that may support snow, ice, or debris.
·
See pages 13 AND 14 for recommended flue vent arrangements.
I(S)HRDV HORIZONTAL FLUE SIZING
Unit Type
Flue Pipe Diameter
Maximum Length of Flue Pipe
I(S)HRDV-100
4.0 IN
82.0 FT
I(S)HRDV-125
4.0 IN
82.0 FT
I(S)HRDV-160
4.0 IN
82.0 FT
I(S)HRDV-210
6.0 IN
72.0 FT
I(S)HRDV-250
6.0 IN
72.0 FT
I(S)HRDV-300
6.0 IN
72.0 FT
I(S)HRDV-400
6.0 IN
72.0 FT
Table 1
5
