Auxiliary ventilation system for underground sites

Details Auxiliary ventilation system for underground sites Auxiliary ventilation system for underground sites

F - Mech Eng,Light,Heat,Weapons

24

F

98/6

F24F 7/007 (2006.01) E21F 1/00 (2006.01) E21F 1/08 (2006.01)

Patent

CA 1155328

ABSTRACT OF THE DISCLOSURE An auxiliary ventilation system for an underground site comprises an air box through which extend first and second chambers each having inlet and outlet ports and being in communication with one another. Flap members are mounted one in each chamber to be pivotal, about associated axes extending centrally of the flap members and transversely of the chambers, between first positions permitting substantially axial flow through each chamber from its inlet port to its outlet port, and second positions defining a passage through the air box from the inlet port of the first chamber to the inlet port of the second chamber. Means, preferably in the form of a further flap member, are provided which are movable with said flap members to seal the chambers from one another with said flap members in their first positions and to interconnect said chambers with the flap members in their second positions. 1.

386976

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