A single switch should operate all of the lights in Intake and discharge points should not be situated 3.20 3.21 a unit. where they will cause vitiated air to be drawn into a system (see paragraphs 3.57–3.68 in Part A, AHU intakes and discharges which give detailed information). In existing systems, it may be necessary to extend the intake or discharge point to a suitable position.
3.20 A single switch should operate all of the lights in a unit. AHU intakes and discharges 3.21 Intake and discharge points should not be situated where they will cause vitiated air to be drawn into a system (see paragraphs 3.57–3.68 in Part A, which give detailed information). In existing systems, it may be necessary to extend the intake or discharge point to a suitable position.