11. Fire prevention during installation and use of heating ap-
pliances
Selected from ČSN 061008 – Fire safety of local appliances and heat sources.
Safe distances
When installing the appliance, keep a minimum safe distance of 200 mm from building materials.
This distance is valid for boilers and flue-gas ducts positioned near flammable materials of the B, C1
and C2 flammability class materials (the flammability classes are listed in chart 1). It is necessary to
double the 200 mm safe distance if the boilers and flue-gas ducts are placed near flammable materials
of C3 class (see chart 1). It is also necessary to double the safe distance if the flammability class of
the material in question cannot be determined. The safe distance can be decreased to one half (to 100
mm) if a heat insulating, non-combustible screen (asbestos board) of a 5 mm minimum thickness, is
placed 25 mm from the protected combustible material (so called flammable insulation). The screen-
ing board or protection screen (on the protected object) must exceed the boiler outline including its
flue-gas duct on each side by at least 150 mm and by at least 300 mm above its upper surface. The
screening board or protection screen must be also used for all fixtures and fittings from combustible
materials in cases where the safe distance cannot be maintained (such as in mobile structures or
wooden cottages etc. - for more details see ČSN 061008 standard). The safe distance must be main-
tained even when placing fixtures and fittings near the boilers.
If boilers are placed on floors from combustible materials, the floor must be fitted with a non-com-
bustible, heat insulating pad exceeding the boiler’s ground-outline on the side where the stoking and
ash-pan apertures are, by at least 300 mm (in front of the aperture) and on all the other sides by at least
100 mm. The non-combustible, heat insulating pad can be made from any material of A flammability
class.
Chart 1
Flammability classes of building mate-
rials and products
A – non-combustible
granite, sandstone, concrete, bricks, ceramic tiles, mortars,
reproong plasters etc.)
B – non-easily ammable
Akumin, Izomin, Heraklit, Lignos, basalt felt boards, bre-
glass boards, Novodur
C1 – low degree of ammability
deciduous tree wood (oak, beech), Hobrex boards, plywood,
Sirkolit, Werzalit, hardened paper (Formica), Ecrona)
C2 – medium degree of ammability
coniferous tree wood (pine tree, larch, spruce), chipboards
and cork boards, rubber ooring (Industrial, Super)
C3 – high degree of ammability
breboards (Hobra, Sololak, Sololit), cellulose materials,
polyurethane, polystyrene, polyethylene, foamed PVC
In circumstances when there is a risk of temporary access of flammable gases or fumes, or
during works when a temporary fire or explosion risk may possibly occur (such as gluing
linoleum, PVC etc.) the boilers must be put out of operation long enough before the risk
occurrence. No items from flammable materials may be placed on the boilers or near
them for a distance lower than the specified safe distance (more see ČSN EN 13501-1).
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