Chlorofluorocarbons (CFCs) were commonly used as refrigerants in older centrifugal chillers and other HVAC equipment.
Due to their ozone-depleting potential, their production has been phased out under the Montreal Protocol.
They are not used in fire hydrants, roof-top vents, or as insulation agents.
Why the other options are incorrect:
A. Fire hydrants — No relation to CFCs.
B. Roof-top vents — Do not contain refrigerants.
C. Insulation agents — CFCs were used in older foam insulation but are mostly replaced; chillers are a more common known application in LEED context.
D. Centrifugal chillers
Explanation:
Chlorofluorocarbons (CFCs) were commonly used as refrigerants in centrifugal chillers. Due to their harmful effects on the ozone layer, their use has been phased out and replaced with more environmentally friendly alternatives.
The other options are incorrect as CFCs were not typically used in those applications.
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