White round outlets can be surface mounted or set flush into the plaster, so their visual impact is minimal. Surface-mounted versions are supplied in white and can be painted any colour to match your decor.

They are normally fitted in pairs. Together they mix and distribute air evenly and without draughts, keeping the temperature within about 1°C across the room, with no hot or cold spots.

Ceilings can also take plaster-flush 25 mm linear slots. These can be fitted singly or joined in a run, set into coving or mitred around a perimeter corner, so that the outlets become part of the design of the ceiling.