CO2 cylinder unit consists of Cylinder, Collection Pipe, Connecting Pipe, Open Device, Fixed frame, Cylinder Holder, etc. Fixed frame of steel iron should be solidly fabricated to ensure easy mounting and dismounting of cylinders, so that each cylinder may be independently weighted. Proper CO2 cylinder unit should be selected from the specifications best fit to the installation site. CO2 Extinguishing System/ Fire Suppression in Malaysia.