Ventilation arrangements

Abstract

A ventilation arrangement housing which has an upper curved guide member and a cruciform arrangement of divider plates to define the housing into quadrants. Air may enter and exit the housing via a louvre arrangement.

1 .- 19 . (canceled) 
     
     
         20 . A ventilation arrangement for ventilating a building interior, the ventilation arrangement comprising: an air duct which extends in use from roof level into an interior of the building to be ventilated to convey air between the exterior and interior of the building; a housing with ventilation openings which extend around an upper part of the air duct to direct moving air caused by wind movement into or out of the air duct; the ventilation openings having a louvre configuration defining a plurality of discrete openings, one above each other; and a guide member provided in a topmost part of the housing, the guide member providing a profiled surface closing the top of the housing interior, with the profiled surface curving concavely downwardly from the sides or adjacent the sides of the housing to a substantially central apex, the guide member also providing an elongate conduit extending downwardly from the central apex to locate cables or other line means. 
     
     
         21 . A ventilation arrangement according to  claim 20 , in which the air duct is divided longitudinally by plates. 
     
     
         22 . A ventilation arrangement according to  claim 21 , in which the divider plates extend through slots in the profiled surface of the guide member. 
     
     
         23 . A ventilation arrangement according to  claim 21 , in which the divider plates abut against the guide member. 
     
     
         24 . A ventilation arrangement according to  claim 21 , in which the divider plates divide the air duct into four quadrants. 
     
     
         25 . A ventilation arrangement according to  claim 20 , in which one or more formations are provided on the guide member engageable with the louvre configuration. 
     
     
         26 . A ventilation arrangement according to  claim 25 , in which the guide member is offset such that the guide member engages with adjacent divider plates at different respective spacings from the central apex. 
     
     
         27 . A ventilation arrangement according to  claim 26 , in which the profiled surface of the guide member is non uniform between adjacent divider plates. 
     
     
         28 . A ventilation arrangement according to  claim 27 , in which the divider plates have formations on their surfaces. 
     
     
         29 . A ventilation arrangement according to  claim 28 , in which grooves are provided on the divider plates. 
     
     
         30 . A ventilation arrangement according to  claim 29 , in which the grooves correspond to ridges on the opposite side of the divider plates. 
     
     
         31 . A ventilation arrangement according to  claim 28 , in which the formations follow the profile of the guide member in the topmost part of the housing. 
     
     
         32 . A ventilation arrangement according to  claim 20 , in which formations and/or trim lines are provided on the guide member to permit the same design of guide member to be used with different sizes of ventilation arrangements. 
     
     
         33 . A ventilation arrangement according to  claim 20 , in which the guide member is made of plastics material. 
     
     
         34 . A ventilation arrangement according to  claim 33 , in which the guide member is made by vacuum forming of recycled ABS.