SFL Sflue Formally Selkirk SMW Multi-Fuel Twin Wall Chimney Rain Cap   The Sflue Twin Wall Chimney System is fully compatible with the old Selkirk SMW, SM, SMZ and Metalbestos chimney system and is suitable for use with woodburning and multi fuel stoves. Please select the correct internal flue diameter/size, colour and with mesh/without from the drop-down options above.   Delivery Unfortunately, our couriers do charge extra for some Highlands and Islands post codes. Please see below for the applicable rates.   Additional Postage Costs Per Item are Applicable as Follows: Scotish Highlands & Islands £12.00 Northen Ireland £12.00 Channel Islands £12.00 Isle of Man £12.00 Isle of Wight £19.00 Delivery Time 2 Working Days to These Areas