There are two main types of Ultra Fog patented nozzles: open and bulb nozzles, which are common for both in the way the water fog is created. They have a unique design, which forces high pressure water through small grooves in a washer this creates even smaller droplets and provides more effective fire extinguishing. The nozzle with a bulb is normally closed and is used in systems with conventional activation. The open nozzle is normally open and is used in systems with intelligent activation. Both nozzle types are available in models that are to be mounted either with the piping inside a wall or ceiling or on the surface of a wall or ceiling. The nozzles can be coated or painted in almost any material or colour. As standard the nozzles are polished stainless steel.