The OSHA standard (1910.151) is silent on required distances and specifications. Therefore, OSHA refers to the recommendations in the American National Standard for Emergency Eyewash and Shower Equipment, ANSI Z358.1-1990. The ANSI standard establishes minimum performance requirements for eyewash and shower equipment. The standard provides uniform requirements for equipment performance, installation, test procedures, and maintenance and training. You may obtain a copy of this standard by contacting the American National Standards Institute at 212-642-4900.