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1.1.2. Minimum clearance for installation and combustibility of
construction materials.
The applicable minimum clearances in your country may differ from the
ones specified bellow (see picture 1). Please consult your installer.
Figure 1. Recommended clearance between the boiler and walls.
The minimum distance from the heating boiler or exhaust gas pipe to
objects or walls must be at least 200 mm from non-combustive (Class A)
and hard-combustive (Class B) materials. For easily combustible materials
(Class C-F), which quickly burn and burn themselves even after removal of
ignition source (such as paper, cardboard, asphalt and tar paper, wood and
wood-fiber boards, plastics, floor coverings) the safe distance has to be
doubled to 400 mm.
EN 13 501-1 classification of materials and products
Class A
Non-
combustible
Granite, sandstone, concrete, bricks,
ceramic tiles, mortars, fireproof plasters, etc.
Class B
Hard-
combustible
Acumin, izumin, heraklit, lignos, boards
and basalt felt, fiberglass boards, etc.
Class C
Medium
combustible
Beech and oak wood, hobrex boards,
plywood, werzalit, umakart, sirkolit, etc.
