BS EN 16475-6:2020 pdf free.Chimneys一Accessories.Access components一Requirements and test methods.
BS EN 16475-6 This document specifies the requirements and test methods for access components comprising a frame and a door or doors which provide access to the flue of a chimney for the purpose of inspection or cleaning. Access components for higher nominal working temperature than 450 °C, positive pressure and wet applications are not covered by this standard. The document is limited to access components with door opening dimensions with a maximum width of 450 mm and a maximum height of 600 mm. Products not freely ventilated are excluded from this document. This document also specifies the requirements for marking, manufacturers’ instruction, product information and information on the AVCP (Assessment and Verification of Constancy of Performance).  Access components already tested together with system chimney products or other chimney components, e.g. flue liners, are not covered by this document.The minimum distance to combustible material may be reduced to 50 % of the above values if a radiation shield creating an air gap, made from non-combustible material, is installed between the access component and the adjacent combustible materials.  NOTE The minimum distance to combustible materials only takes into account the fire protection and not e.g. operational requirements. Freely ventilated means that ventilation of the space around the access component is not enclosed by, e.g. fitting it in a cupboard. If tested according to 5.3 the temperature on the combustible material shall not exceed 85 °C during the heat stress test and shall not exceed 100 °C during the sootfire test. A multiple layer access component may only be designated G if the outer surface temperature does not change by more than 10 % when the heat stress test is repeated after the sootfire test.When an access component is tested according to the test method described in 5.4 both before and after the thermal performance tests, the leakage rate shall not be greater than 1,5 l.s-.m-1 of joint length at a test pressure of 40 Pa and shall be measured on the largest door size in a manufacturer’s range suitable for a chimney of 200 mm diameter or equivalent area.BS EN 16475-6 pdf download.