The FLDL (previously known as FLDL-UL) is a self-attaching fusible link louvre successfully fire tested for use on steel and timber doors. In normal operation the blades can be opened and shut manually by means of a finger pull (always mounted on lower right hand side). In the event of fire, it has a fusible link made of lead situated above a heat slot in the top of the frame which parts at 165°F (74°C) and allows the stainless steel spring mechanism to snap the louvre blades shut. A simple adjustable louvre with similar mechanism, but without the fusible link (ref ADL) is shown on page 106. It complements the standard AFDL self-attaching louvre already used by many door companies and available ex-stock, as detailed on pages 100-103.The FLDL is a self-attaching louvre (i.e. no holes need be drilled in the door) with concealed fixings one side, and has been tested at Exova Warringtonfire for four hours (integrity) to BS EN 1634-1: 2014 up to a maximum aperture size of 610x610mm. Copy of Exova Warringtonfire Report available on request. It is available from stock in standard galvanised grey primed finish, suitable for powder coating and in stainless steel Grades 304 and 316 to special order. The FLDL has also been fire tested at Chiltern Fire and is suitable for 30 minutes integrity on 44mm thick timber fire doors using AL134PSA intumescent aperture liner and 60 minutes integrity on 54mm thick timber fire doors using AL218PSA intumescent aperture liner. The intumescent aperture liners are self-adhesive and should line all four sides of the door cut-out before the louvre is installed in timber doors.
