Can someone give me a little insight on the pro's and con's on blast freezer design in regards to amonnia verses carbon dioxide. Is it a better medium to use in way of safety,freezing and or the cost to design and install. We are looking at installing some blast cells for tric pork we currently run on amonnia the plant runs on the same suction line so we would have to put in a seperate suction line for the blast cells in order to get the temps that they want instead of bringing the whole plant down to that low of a suction pressure.