Building vent assembly

DETAILED DESCRIPTION The present invention aims to overcome or alleviate one or more of the above disadvantages or at least to provide an alternative to the presently known vent systems for buildings such as igloo type agricultural buildings.
The present invention thus provides a vent assembly for a building of the type having a roof frame assembly terminating at one side of said building at a side frame member extending longitudinally of the building, the vent assembly including a further frame member supported on the roof frame assembly at a position spaced from and extending substantially parallel to said side frame member.
A vent opening into said building is formed in the region between the side and further frame member, and vent closing means are secured to the further frame member and are movable to open and close the vent opening.
The vent closing means comprises a roller blind or screen secured at, one end to the further member, the roller blind being adapted to be unrolled to close the vent opening or rolled up to open the vent opening.
The further frame member preferably defines a gutter and the main roof covering is supported on the roof frame assembly and terminates at the gutter.
The further frame member is preferably of Z-sectioned form with its middle flange lying on and supported by the roof frame assembly.
One side of the said Z-sectioned frame member is slotted so as to cooperate with said roof frame assembly.
The side frame member comprises a side gutter member for the building and the roof frame assembly includes a plurality of roof frame members supported to the side gutter member.
The side gutter member includes a pair of opposite upstanding side walls and a pair of top flanges extending inwardly from the opposite side walls.
A region of the roof frame assembly adjacent the side frame member is covered by a covering providing a seal adjacent the side frame member, the roller blind in its closed position overlying the covering.
Preferably, a cable is supported on the roof frame assembly and extends substantially parallel to the side frame member or gutter, the covering extending between the cable and the side frame member or gutter