Buffing operations shall be located in a room separated from the remainder of the building housing the tire rebuilding or tire recapping operation by a 1-hour fire barrier.
Exception: Buffing operations are not required to be separated where all of the following conditions are met:
- Buffing operations are equipped with an approved continuous automatic water-spray system directed at the point of cutting action;
- Buffing machines are connected to particle-collecting systems providing a minimum air movement of 1,500 cubic feet per minute (cfm) (0.71 m3/s) in volume and 4,500 feet per minute (fpm) (23 m/s) in-line velocity; and
- The collecting system shall discharge the rubber particles to an approved outdoor noncombustible or fire-resistant container, which is emptied at frequent intervals to prevent overflow.