Viessmann Vitodens 100-W WB1B Series Installation Instructions Manual page 7

Flexible Venting Installation
Important Regulatory and Installation Requirements
Vent termination location requirements (for installations in Canada)
The vent must be installed observing local regulations in addition to National Codes, CAN/CSA-B149.1 or 2.
The flexible vent pipe can only be used in vertical installations.
A vent must NOT terminate...
1..directly above a paved sidewalk or paved driveway
which is located between two single-family dwellings
and serves both dwellings.
2..less than 7 ft. (2.13 m) above a paved sidewalk or a
paved driveway located on public property.
3..within 6 ft. (1.83 m) of a mechanical air supply inlet
to any building (dryer vents, non-sealed combustion
furnace and hot water heater vents are considered to
be mechanical air inlets).
4..above a meter/regulator assembly within 3 ft. (0.9 m)
horizontally of the vertical centerline of the regulator vent
outlet and to a maximum vertical distance of 15 ft. (4.5 m).
5..within 3 ft. (0.9 m) of any gas service regulator vent outlet.
6..less than 1 ft. (0.3 m) above grade level or anticipated
snow level (consult local building authorities or local
weather office). Locate the vent termination in such a
way that it cannot be blocked by snow.
7..within the following distances of a window or door
which can be opened in any building, any
non-mechanical air supply inlet to any building or the
combustion air inlet of any other appliance:
1 ft. (0.3 m) for inputs up to and including 100,000

Btu/h (30 kW).
3 ft. (0.9 m) for input exceeding 100,000 Btu/h (30 kW).

Vent termination location requirements (for installations in the U.S.A.)
The vent must be installed observing local regulations in addition to National Codes, ANSI-Z223.1 or NFPA 54.
The flexible vent pipe can only be used in vertical installations.
A vent must NOT terminate...
1..less than 7 ft. (2.13 m) above a paved sidewalk or a
paved driveway located on public property.
2..within 4 ft. (1.2 m) horizontally from service regulator
vents, electric and gas meters as well as relief equipment.
3..at least 3 ft. (0.9 m) above any forced air inlet located
within 10 ft. (3 m).
4..less than 1 ft. (0.3 m) above grade level or anticipated
snow level (consult local building authorities or local
weather office). Locate the vent termination in such a
way that it cannot be blocked by snow.
5..within 1 ft. (0.3 m) of a window or door which can
be opened in any building, any non-mechanical air
supply inlet to any building or the combustion inlet of
any other appliance.
8..underneath a veranda, porch or deck, unless:
the veranda, porch, or deck is fully open on a

minimum of two sides beneath the floor, and
the distance between the top of the vent termination

and the underside of the veranda, porch, or deck is
greater than 1 ft. (0.3 m).
* 1
9..in areas where condensation may cause problems,
such as above planters, patios, or adjacent to windows
where flue gases may cause fogging.
10..within 3 ft. (0.9 m) to the property line (advisable,
not mandatory; please check with local building
authorities and municipal bylaws).
11..at a location where ice formation on the ground can
present a hazard.
12..so that the flue gases are directed toward brickwork,
siding, or other construction, in such a manner that
may cause damage from heat or condensate from the
flue gases.
13..where discharging hot flue gases may cause property
damage or personal injury.
14..within 3 ft. (0.9 m) from an inside corner of outside
walls.
* 1 Including heat recovery units.
6..in areas where condensation may cause problems,
such as above planters, patios, or adjacent to windows
where flue gases may cause fogging.
7..within 3 ft. (0.9 m) to the property line (advisable, not
mandatory; please check with local building authorities
and municipal bylaws).
8..at a location where ice formation on the ground can
present a hazard.
9..so that the flue gases are directed toward brickwork,
siding, or other construction, in such a manner that
may cause damage from heat or condensate from the
flue gases.
10..where discharging hot flue gases may cause property
damage or personal injury.
11..within 3 ft. (0.9 m) from an inside corner of outside
walls.
(continued)
Safety
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