(b) If an extreme hardship would result (imminent danger to health and property) by shutting off the gas and the operator can render the condition temporarily safe, the gas may remain on for Class B conditions other than the one described in paragraph (c)(1) of this section.

1. (1) If the operator leaves the gas on and is not notified within five calendar days that repairs have been made, it shall conduct a reinspection and shall shut off the gas if the hazardous condition has not been permanently repaired.

(c) Class B conditions include, but are not limited to:

1. (1) any leaking gas appliance inside the building which cannot be stopped by temporary or permanent repair means;
2. (2) any gas appliance with a missing or inoperative required safety device;
3. (3) defective or improper wiring which may cause an unsafe condition on a gas appliance;
4. (4) any space heater or water heater with an inoperative thermostat;
5. (5) open flame burners too close to combustibles; and
6. (6) any unit other than a heating or hot water appliance having visual indications of improper combustion.