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It may be fully opened when rapid heating is required or to help clean any deposits from the glass. It will not be possible to keep the glass clean if this control is fully closed, particularly immediately after refuelling. RIDDLING When burning solid fuels riddling twicea day is usually sufficient. When burning wood or peat, ash should be allowed to build up and generally weekly riddling will be sufficient. The fire should be riddled with the doors shut (see Fig 2.) Place the tool onto the ridd