Technical information

11
Tab. no. 6 Grade of reaction to fire
Grade of reaction to fire
Examples of building materials and products included in the reaction to fire
(Extract from EN 13 501-1 + A1)
A1
– incombustible
Granite, sandstone, concrete, bricks, ceramic tiles, mortars, fireproof plasters, …
A2
– combustible with difficulty
acumin, izumin, heraklit, lignos, boards and basalt felt, fibreglass boards,...
B
– hardly combustible
Beech and oak wood, hobrex boards, plywood, werzalit, umakart, sirkolit,...
C (D)
– medium combustible
Pinewood, larch, whitewood, chipboard and cork boards, rubber flooring,...
E (F) – easily combustible
Asphaltboard, fibreboards, cellulose materials, polyurethane, polystyrene,
polyethylene, PVC,…
Boiler positioning with regard to the necessary handling space:
• Basic environment AA5/AB5 according to ČSN 33 2000-1 ed. 2.
• In front of the boiler there must be left a minimum handling area of 1000 mm.
• The minimum distance between the rear part of boiler and the wall 400 mm.
• At least from one side part keep the access area to the back boiler part of minimum 400 mm.
Fuel positioning:
• It is interdicted to store the fuel behind the boiler or next to the boiler within a distance smaller than
400 mm.
• It is interdicted to store the fuel between two boilers in the boiler-room.
• The producer recommends to keep the distance between the boiler and fuel min. 1000 mm or to store
the fuel in a different room that where the boiler is installed.
The selection of the right boiler size
The selection of the right boiler size, it means the heating output, is very important condition for economic
operation and the right boiler function. The boiler must be selected so that the heating output conforms to the
heating loss of the object. The nominal output of the boiler is counted according to the valid rules for outside
temperature –12 °C, -15 °C and –18 °C. The boiler selection with too high heating output (overrating) results
in tarring and ratting of boiler. It is not useful to use the boiler with higher output than the heating loss of the
boject.
Chimney draught
The chimney with the right chimney draught is the fundamental prerequisite for the right boiler function. It
influences the boiler output as well as its efficiency. The boiler can be connected to the venting unit with the
sufficient chimney draught, see. Chapter no. 1.3. and if the revision by the certified organization is made.