A Fan Delay Timer connected to the lighting circuit, for ventilation run-on period after the light has been switched off. The timer is adjustable between 30 seconds and 20 min and has 2.5A @ 240V AC inductive load with supply voltage 220-240V 50Hz. The controller can be surface or recess mounted and is 100mm (w) x 86mm (h) x 45mm (d). DT20B can be used with many axial extract fan ranges. Xcontrol is a wide range of controllers for managing rotation speed, direction, operation time and air flow of various Xpelair fans. Designed to blend with all surroundings. Design coordinated range. High durability.