Permitted Fuels; Firewood - Fröling SP Dual compact 15 Operating Instructions Manual

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2.4.2 Permitted fuels

Firewood

Water content
Note on standards
Tips for
storing wood
12
Firewood up to max. 55 cm long.
Water content (w) greater than 15% (equivalent to wood moisture u > 17%)
Water content (w) less than 25% (equivalent to wood moisture u < 33%)
EU: Fuel as per EN ISO 17225 – Part 5: Firewood class A2 / D15 L50
Additional for
Germany: Fuel class 4 (§3 of the First Federal Emissions Protection Ordinance
(BimSchV) in the last amended version)
▪ Use wind-exposed areas where possible for storage (e.g. store at edge of forest instead
of in forest)
▪ Walls of buildings facing the sun are ideal
▪ Create a dry underlay, where possible with air access (line with round timber, pallets,
etc.)
▪ stack split wood and store in such a way that it is protected from the elements
▪ If possible, stock fuel for the day in a warm place (e.g. in boiler room) (pre-heats the
fuel!)
Storage time dependent upon water content
Storage in heated and ventilated room
(approx. 20°C)
Outdoor storage (protected from
elements, exposed to wind)
Freshly cut wood has an approximate water content of 50 to 60%. As the above table
shows, the water content of the firewood decreases the longer the wood is stored
depending on how dry and warm the storage location is. The ideal water content of
firewood is between 15 and 25%. If the water content falls below 15%, we recommend
you adjust the combustion control to the fuel.
Fröling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com
Wood type
15 – 25%
Soft wood (e.g. approx.
spruce) 6 months
Hardwood (e.g. 1 – 1.5 years
beech)
Soft wood (e.g. 2 summers
spruce)
Hardwood (e.g. 3 summers
beech)
Safety
Permitted uses
Water content
less than 15
%
from 1 year
from 2 years
from 2 years
from 3 years