NTI Matrix M100 Installation And Operating Instructions Manual page 11

Matrix Installation and Operation Instructions
3.4 Venting Clearances
These are code restrictions for the location of the Flue gas vent terminal. Compliance doesn't insure a satisfactory installation; good
common sense must also be applied.
The vent terminal shall not terminate:
1. Directly above a paved sidewalk or a paved driveway that is located between two buildings, and that serves both buildings;
2. Less than 7 feet above grade where located adjacent to a paved walkway or driveway located on public property.
3. Within 3' (three feet) of a window or door that can be opened, or non-mechanical air supply inlet to any building.
4. Within 6' of a mechanical air supply inlet to any building, or roof eve containing soffit openings.
5. Above a meter/regulator assembly within 3' horizontally of the vertical centerline of the regulator.
6. Within 3' horizontally of any gas service regulator vent outlet up to a height of 15'.
7. Less than 30" plus snow allowance above grade, or any surface that will support snow, ice, or debris. The exhaust must be a
minimum of 18" above the air inlet, and the air inlet must always be a minimum of 12" plus snow allowance above any surface that
will support snow. (Two feet plus snow allowance is highly recommended). Consult your weather office, for the maximum typical
snowfall for your region.
8. Underneath a wooden verandah, porch, or deck.
9. Underneath cement verandah, porch, or deck, unless both ends are open and the exhaust pipe is installed at least 24" under the
deck floor.
10. So situated that the flue gases are directed towards brickwork, siding, or other construction, in such a manner that may cause
damage from heat or condensate from the flue gases.
11. Less than 3' from an inside corner of an L-shaped structure (including walls and fences).
12. Install the warning plate "Gas Vent Directly Below" 4 feet above the location of the air inlet pipe, so it is visible from at least
eight (8) feet away (Plastic Label included in the Installation Manual Package – see figure).
3.5 Determining Vent Lengths
Use the following chart to determine the maximum amount of vent pipe that can be used. This chart calculates, sweep and 45º
elbows, and 90º elbows at 5 equivalent feet. Note: chart shows allowable equivalent vent lengths for intake and exhaust vents
separately, thus an M100V operating on Natural Gas can be installed with 105 equivalent feet of intake venting and 105 equivalent
feet of exhaust venting.
IMPORTANT
The length of one vent pipe (intake or exhaust) may not exceed the length of the other vent pipe by more
then 20 equivalent feet.
The three 90° elbows of the exterior vent piping (two outlet, and one inlet) do not have to be included, as
they are taken into consideration in the vent calculations.
Propane Gas (LP) maximum vent length cannot exceed 50 equivalent feet.
Table 3.2 Maximum Vent Length
Vent
Model
Size
M100 3"
M100V
3"
Max. Equiv.
Gas
Length
Natural 105
LP 50
Number of Elbows or 45's
1 2 3 4
100 95 90 85
45 40 35 30
11
5 6 7 8
80 75 70 65
25 20 15 10
9
60
5