Each handwashing facility shall be provided with hot water of at least 105°F (congruent to 40.5°C) and cold water tempered by means of a mixing valve or combination faucet. Any self- closing, slow-closing or metering faucet used shall be designed to provide a flow of water for at least 15 seconds without the need to reactivate the faucet. Steam mixing valves are prohibited at handwashing facilities.