A louvre assembly , comprising: a louvre housing having a continuous louvre housing perimeter wall ; a louvre housing cavity surroundingly defined and formed by the louvre housing perimeter wall so as to have first and second laterally spaced open faces; a louvre formation comprising a plural array of louvre slats removably mountable within the louvre housing cavity ; wherein the louvre housing perimeter wall is adapted to mountingly receive the removably mountable louvre formation; a baffle formation removably mountable over said first open face; an apertured second closure plate associatively engageable with the louvre housing to seat over said second open face wherein the second closure plate is configured to extend across the entire area of the second open face defined by the louvre housing perimeter wall and to close the same, save for the aperture(s) therein; characterised in that the baffle formation comprises: an apertured first closure plate associatively engageable with the louvre housing to seat over said first open face; an unapertured baffle box back plate ; a baffle box perimeter formation extending between and laterally spacing apart the first closure plate and the baffle box back plate and forming thereby a baffle cavity; the baffle box perimeter formation having at least one apertured portion communicating with the said baffle cavity; and further characterised in that the louvre housing perimeter wall comprises a louvre formation mounting system comprising one or more apertured portions for the removable insertion of through fixings. a louvre housing having a continuous louvre housing perimeter wall ; a louvre housing cavity surroundingly defined and formed by the louvre housing perimeter wall so as to have first and second laterally spaced open faces; a louvre formation comprising a plural array of louvre slats removably mountable within the louvre housing cavity ; wherein the louvre housing perimeter wall is adapted to mountingly receive the removably mountable louvre formation; a baffle formation removably mountable over said first open face; an apertured second closure plate associatively engageable with the louvre housing to seat over said second open face wherein the second closure plate is configured to extend across the entire area of the second open face defined by the louvre housing perimeter wall and to close the same, save for the aperture(s) therein; characterised in that the baffle formation comprises: an apertured first closure plate associatively engageable with the louvre housing to seat over said first open face; an unapertured baffle box back plate ; a baffle box perimeter formation extending between and laterally spacing apart the first closure plate and the baffle box back plate and forming thereby a baffle cavity; the baffle box perimeter formation having at least one apertured portion communicating with the said baffle cavity; an apertured first closure plate associatively engageable with the louvre housing to seat over said first open face; an unapertured baffle box back plate ; a baffle box perimeter formation extending between and laterally spacing apart the first closure plate and the baffle box back plate and forming thereby a baffle cavity; the baffle box perimeter formation having at least one apertured portion communicating with the said baffle cavity; and further characterised in that the louvre housing perimeter wall comprises a louvre formation mounting system comprising one or more apertured portions for the removable insertion of through fixings. <EOS>