Wall-mountable spray head unit

A wall-mountable spray head unit comprising:

• a rotatable spray head assembly which comprises:
• a spray manifold rotatable about a first axis;
• a spray nozzle supported by the spray manifold and orientated to deliver fire-suppressant material radially in a plane defined by the first axis and a second axis which is perpendicular to the first axis;
• and
• at least one thermal sensor supported by the spray manifold, aligned with the nozzle, aligned with the plane and configured to move with the nozzle and sense in the plane,
• wherein the spray manifold comprises a face that is rotatable about the first axis and wherein the spray nozzle and the at least one thermal sensor are set in the face;
• and
• a pivot base on which the rotatable spray head assembly is mounted, the pivot base comprising an inlet port through which the fire suppressant material enters the wall-mountable spray head unit, an outlet port through which the fire-suppressant material enters the rotatable spray head assembly, and a diagonal channel for the fire-suppressant material between the inlet and outlet ports,
• wherein the inlet port is in fluid communication with the nozzle via the outlet port and is offset in a direction into a wall with respect to the first axis, and wherein the outlet port is aligned with the first axis and extends into the spray manifold.