The CRA can also be supplied with the ability to change the supply air pattern automatically. This is coded: CRA-T In this form the diffuser will throw air horizontally with a supply air temperature below 24°C and air with a temperature above 28°C will be thrown vertically. This is achieved with a thermal power pill. No wiring is required.
Circular Louvred Face Ceiling Diffusers shall be Holyoake Model CRA-T with thermal core adjustment. Diffusers shall be of spun aluminium construction with Holyoake thermal power pill. With supply air temperatures below 24 degree, the supply air pattern is diffused horizontally. With supply air temperatures above 28 degrees, the core is automatically lifted to produce a supply air pattern diffused vertically. Diffusers shall be finished in powder coat and fitted with accessories and dampers where indicated as manufactured by Holyoake.