(57) A louvred fire ventilator for inclusion in e.g. curtain walling or equivalent, lightweight
building structures, has a lightweight, knock-together frame (100) made up of tubular
side frame members (102) housing control gear (150 to 158) for operating the louvre
blades (108) and top and bottom frame members having inner tubular parts (106, 104)
receiving force-fitted plugging members (126, 124) (see Fig. 7) fixed to the side
frame members to join the frame together. The separate outer and interchangeable frame
member parts (102d, 130, 131) are adapted with fixing beads (130c, 131c, 114d) of
different forms for mounting the ventilator in the cladding or glazing plane of any
curtain walling or glazing system for which it is intended. The frame members and
the louvre blades are formed as extrusions, cut predeterminedly to required lengths,
and the louvre blades are plugged at the ends with elastomeric plugging members (140)
which mount the louvre blade pivots (142) (see Fig. 21), the elastomeric plugging
members (140) having sealing lips (104c, 104d, 104g) which make sealing engagement
with the frame (100). A version having a single, bottom hung, outwardly opening fire
ventilation flap (159) (see Fig. 22) is also described.
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