They dedicate to aspirate foam solution at desired expansion ratio and deflect it to fire hazard area.
Variety of models are available:
Foam chambers for fixed roof fuel storage tank (with backpressure resistant seal)
Foam Maker and foam pourer for floating roof fuel storage tank or Dike areas
Foam spray nozzles
Foam sprinkler
Grate nozzles
Foam Monitors
High backpressure foam generator with related rapture disc
High expansion foam generator (with or without fan)