gure 14
Chimney cap
windproof
Flue
pipe
Inspection
gure 15
External pipe
that is isolated
inspection
gure 16
Inspection
CHIMNEY CAP10.3.5.
The chimney cap must comply with the following requisites:
have an internal section equivalent to that of the chimney;
have useful outlet section not lower than double the chimney
internal section;
be built in order to avoid rain, snow, foreign bodies
penetrating the chimney and so that, in the event of winds in
any direction and inclination, the discharge of the combustion
products is assured.
be positioned in a way to guarantee an adequate dispersion
and dilution of the combustion products and, however, outside
the reux area in which the formation of counterpressures
occurs. Such area has dierent dimensions and conguration
depending on the covering inclination angle. It is therefore
necessary to adopt the minimum heights indicated in the gure
layouts below.
The chimney cap must not have mechanical intake means.
FLAT ROOF
gure 17
SLOPING ROOF
Z=REFLUX AREA
gure 18
CHIMNEY CAPS, DISTANCES AND POSITIONING
Roof incli-
nation
Distance between
the ridge and the
chimney
Minimum chimney height
(measured from outlet)
β A (m) H (m)
15°
< 1,85 0.50 m over the ridge
> 1,85 1.00 m from roof
30°
< 1,50 0.50 m over the ridge
> 1,50 1.30 m from roof
45°
< 1,30 0.50 m over the ridge
> 1,30 2.00 m from roof
60°
< 1,20 0.50 m over the ridge
> 1,20 2.60 m from roof
CONNECTION TO EXTERNAL AIR 10.4.
INLETS
The appliance must be able to use the necessary air to guarantee
regular functioning through external air inlet. The air inlets must
comply with the following requisites:
have a total free section of at least 80 cm².
must be protected by grates, metal net or suitable protections
as long as they do not reduce the minimum section stated in
the previous point and positioned in order to avoid them being
obstructed.
If the combustion agent air is withdrawn directly from outside
through a pipe, a downward bend must be mounted outside
or a protection against the wind and no grates or similar must
be positioned, (it is recommended that the air vent always
communicates directly with the installation room even if the air is
withdrawn from outside through a pipe). The air ow can also be
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