Dortechs structurally bonded vent is designed to conceal opening vents when glazed into a curtain wall grid and maximise the glazed area of each window. The frameless vent pictured above includes a silicone bonded, external intermediate mullion cap to ensure the buildings facade maintains a consistent module appearance throughout. All framework has a dual finish with a matt black external paint finish and a white internal finish. The vent can be either top hung, side hung (outwards opening) or tilt and turn (inwards opening).