Wall-mountable spray head unit

A wall-mountable spray head unit comprising:

• a rotatable spray head assembly comprising
• a spray nozzle configured to deliver fire-suppressant material, and
• a spray manifold rotatable about a first axis, wherein the spray nozzle is supported by the spray manifold,
• wherein, when the wall-mountable spray head unit is mounted to a wall, the rotatable spray head assembly is configured to rotate the spray nozzle about a first axis up to about ±90° from a reference angle, wherein the reference angle is perpendicular to the wall,
• wherein the spray nozzle is orientated to deliver the fire-suppressant material radially in a plane defined by the first axis and a second axis which is perpendicular to the first axis, and
• wherein the spray nozzle is configured to deliver the fire-suppressant material in an arc in the plane of at least 25° above a horizontal axis and at least 25° below the horizontal axis, the fire suppressant material forming a substantially collimated horizontal jet as distance from the spray nozzle increases,
• wherein the wall-mountable spray head unit further comprises:
• an enclosure having an aperture, wherein the rotatable spray head assembly is housed or mainly housed in the enclosure,
• wherein the spray manifold is shaped as an elongated box including a side face and an end face perpendicular to the side face, the spray nozzle being provided in the end face, and
• wherein the rotatable spray head assembly is arranged such that, in a parked position, the side face is flush with a faceplate of the enclosure and the spray nozzle is not visible through the aperture and is at about ±90° from the reference angle.