The Slimline 3 range is designed to operate on pre-cast, class I and class II flues. The minimum diameter of a circular flue is 125mm (5″) with minimum effective height of 3 metres. Pre-cast flues must be constructed correctly and the appliance must pass a spillage test upon installation. A non-combustible hearth extending a minimum of 300mm (12″) in front of the fire and 150mm (6″) either side, with a non-combustible depth of 50mm (2″) is required.
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