Because the gas generated from _______ is pure CO2, the pipes from the diffusers can be _________ than those needed for CO2 generated on site by combustion.

Because the gas generated from _______ is pure CO2, the pipes from the diffusers can be _________ than those needed for CO2 generated on site by combustion.

• A. Liquid or Gas CO2 Cylinders, Smaller
• B. Liquid or Gas CO2 Cylinders, Larger
• C. Dry Ice or Liquid CO2, Smaller
• D. Dry Ice or Liquid CO2, Larger

Answer: (C)

The key idea is that the purity of the CO2 gas affects how the diffuser piping can be sized. Gas that comes from dry ice or liquid CO2 is pure CO2 and contains no moisture or other combustion byproducts. With such pure gas, there’s less risk of moisture condensation, corrosion, or deposits in the pipes, so you can use smaller-diameter piping to deliver the same flow. On-site CO2 produced by combustion, by contrast, is not pure—it's accompanied by water vapor and other combustion byproducts—so the system needs larger or more robust piping to handle those impurities and the associated moisture. That’s why the option involving Dry Ice or Liquid CO2 and Smaller is the best fit.

The key idea is that the purity of the CO2 gas affects how the diffuser piping can be sized. Gas that comes from dry ice or liquid CO2 is pure CO2 and contains no moisture or other combustion byproducts. With such pure gas, there’s less risk of moisture condensation, corrosion, or deposits in the pipes, so you can use smaller-diameter piping to deliver the same flow. On-site CO2 produced by combustion, by contrast, is not pure—it's accompanied by water vapor and other combustion byproducts—so the system needs larger or more robust piping to handle those impurities and the associated moisture. That’s why the option involving Dry Ice or Liquid CO2 and Smaller is the best fit.