SMW Chimney Systems

The SMW Chimney Systems is designed to be used for Solid, Multi-Fuel, Oil and Gas fired combustion equipment where using the appropriate Support Components. The system is not designed for, and should not be used for positive pressure applications.

Introduction

SMW is a pre-fabricated twin wall insulated chimney system and has been designed specifically to be used on Solid, Multi-fuel, Gas and Oil fired combustion equipment, operating under negative draught conditions. Under no circumstances should SMW be used on appliances that generate excessive condensation such as condensing appliances or where the chimney system has been designed to operate under positive pressure conditions.

The SMW product is manufactured to the highest quality and is CE Marked to BS EN 1856-1, as well as Kitemarked to BS 4543 Parts 2 & 3 and suitable for appliance with flue gas temperatures up to 450°C.

The system consists of straight pipe lengths and associated fittings, which are constructed entirely from stainless steel and have a 25mm insulated annulus. The external casing is weatherproof and carries the structural load, while the inner liner is manufactured from a high grade 316 stainless steel, offering excellent protection from the often corrosive products of combustion and is free to expand or contract as the flue gas temperatures change.

SMW can be used either internally or externally. The relatively low external wall temperature permits installation with only a 50mm air gap clearance to combustible material. The distance to combustible material is related to the thermal testing procedure as defined in both BS EN 1856-1 / BS EN 1859 and the previous BS 4543: Parts 2 & 3.

Composition and manufacture

All lengths and fittings are twin-walled with a 25mm cavity. The outer case is joined to both the male and female couplers, while the inner liner is connected only to the upper male coupler, allowing the liner to expand or contract as the flue gas temperature varies without affecting the structural performance of the outer and removing the need for expansion components such as bellows etc. The SMW product utilises a mineral wool insulating medium providing an optimum and carefully controlled density of 260Kg/m2, which in addition to providing safe operation at high temperature, also maintains a relatively high flue gas temperature throughout the chimney length, enabling the provision of a rapidly established and stable draught. Lengths and fittings utilise a rapid one-eighth turn twist action locking system at the joint, allowing simple and rapid installation of the product. A toggle clip locking band must then be fitted to finish each joint.

Application

SMW is primarily designed for use on domestic and commercial solid, multi-fuel, oil and gas appliances such as stoves, boilers and heaters operating under dry and negative draught conditions where the flue gas temperature will not exceed 450ºC.

The chimney system should be installed in accordance with the requirements of BS 7566 Parts 1 to 4: “Installation of factory-made chimneys to BS 4543 for domestic appliances” and, depending on where used in the United Kingdom, the requirements of: Document “J” of the Building Regulations, Section “F” of the Building Standards (Scotland), Section “L” of the Building Regulations (Northern Ireland). For gas fired appliances of rated input not exceeding 60kW, reference should also be made to BS 5440 Part 1.

The SMW product is manufactured, tested and Kite marked to BS4543: Parts 2 & 3 and CE Marked to BS EN 1856-1 to the designation detailed on page 2. SMW is also manufactured under a Quality Assurance Scheme certificate No. FM01079 administered by British Standards in accordance with BS EN ISO9001:2000. CE Certificate No. 086-CPD-496040. SMW is also listed by HETAS as an approved chimney for solid fuel.