Protherm Leopard 24 BOV User And Installation Instructions Manual - page 26
25
The most frequent kinds of flue design are
illustrated on fig. 16, 17 and 18. The boiler
24 BTV can be used for next following
designs:
• C42 design - connecting to common
chimney
• C62 design - connecting to separately
approved and sold ducts.
• C82 design - air duct leads combustion air
from outdoor environment and flue gas duct
are connected to chimney.
External vent of horizontal ducts on
the façade should be at least:
• 2 m above ground level at publicly
accessible places (0.4 m at other places);
• 0.5 m from sides of windows and other
ventilation openings (grilles) or doors;
• above the top edge of windows, grilles
and doors;
• 1 m below window level, never below
grilles;
• a t d e p t h o f R ( s e e F i g . 1 9 ) b e l ow
overhanging parts (e.g., roofs, balconies).
Minimum span between external vents:
• 1 m horizontal
• 2 m vertical
The external vent should always be
oriented to the open space (not to doors,
windows or grilles). If this re quire ment
cannot be met, the minimum distances
must be preserved as follows:
a) opposite – between the façade with the
external vent and a façade parallel to it:
• 2 m – if the opposite façade has no windows
or grilles;
• 1 m – if neither façade has any windows
or grilles in it;
• 4 m – if there are windows or grilles (or
external vents) in both façades
b) in corners – between the external vent axis
and the façade parallel to it:
• 2 m – if there are any windows, grilles or
doors in the façade;
• 0.5 m – if there are none.
• Corners smaller than 0.5 m are ignored.
All the distances are understood from the
external vent axis to the outer edge of the
respective window, grille or door.
Special instances
The external vent may also be closer
below an overhanging part, provided it is
equipped with a protruding part of the duct,
whose length at least reaches to the circle
of radius “R” – see. fig 19. .
External vent into a shaft leading to the
open space is possible, if the cross-section
area of the shaft is at least 1.25 m
2
along
its length and there are no doors, windows,
grilles or other flue ducts into the shaft
Vertical external vent – to the roof
Roof vents must be at least 0.4 m from
each other and from air-conditioning
outlets/intakes. Its protruding part must
reach above a snow layer 40 cm thick (if it
were lying on the roof).
Safety precautions
Flue ducts must not be vented into
spaces:
• with a risk of explosion;
• internal (attic, corridor, stairwell, etc.);
• that can be closed, such as passages,
etc.
• below ground level (even if open) such as
tunnels, subways, etc.
If an air intake is separately installed, its
location must be assessed similar to the
above rules.
The opening for the duct passage through
a wall should be bored with sufficient extra
clearance (approx. 120 to 150 mm) and the
duct must be sealed inside of it the sealing
flame proof materials – such as mortar,
gypsum, etc. Passages through walls or
ceilings made of flammable materials must
comply with the valid standard.