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Installation and Operation Manual - Osburn 3500
3.2.3 Log Length
Logs should be cut about 25 mm (1") shorter than the
firebox so they fit in easily. Pieces that are slightly too
long make loading the wood fire very difficult. The most
common standard length of firewood is 400 mm (16").
The pieces should be a consistent length, with a
maximum of 25 mm (1") variation from piece to piece.
3.2.4 Piece Size
Firewood dries more quickly when it is split. Large unsplit rounds can take years to
dry enough to burn. Even when dried, unsplit logs are difficult to ignite because they
don’t have the sharp edges where the flames first catch. Logs as small as 75 mm (3")
should be split to encourage drying.
Wood should be split to a range of sizes, from about 75 mm to 150 mm (3" to 6")
in cross section. Having a range of sizes makes starting and rekindling fires much
easier. Often, the firewood purchased from commercial suppliers is not split finely
enough for convenient stoking. It is sometimes advisable to resplit the wood before
stacking to dry.
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