If an appliance exceeds the threshold leak rate, how long does the owner have to retrofit or retire it if using an exempt refrigerant?

When an appliance that uses an exempt refrigerant exceeds the threshold leak rate, the regulations specify that the owner has a mandated time frame of 18 months to retrofit or retire the appliance. This requirement is in place to ensure that appliances using refrigerants that may have less environmental impact still do not contribute to excessive emissions or environmental harm due to leaks. The 18-month timeline allows owners sufficient time to implement necessary modifications or to phase out the appliance responsibly while still complying with environmental regulations.

The other options suggest differing time frames which do not align with the established regulations, potentially leading to confusion about compliance requirements for managing refrigerant leaks.