A ventilation fixture has a main housing 2 with a cavity and a cap 30 coupled to the housing and can be moved away from and towards the cavity to open and close a gap between the main housing and an outer edge of the cap. Either the cap or the housing includes a rim around an edge thereof and comprising one or more cut out portions (38, fig 7) to reduce air speed as air flows through the gap and into the cavity. The rim can be located on the outer edge of the cap and can be supported by a plurality of fins (32, fig 7) extending from the rim to the centre of the cap. The cap can be adjustable by means of a bolt and thread arrangement 28. The main housing might include illumination. The cap may be supported by a cage-like structure 24 that can be held in place by magnets.
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