Where must a safety shower be located in relation to the lab?

A safety shower must be located within 25 feet of the lab or storage room entrance door to ensure quick access in emergencies involving exposure to hazardous materials. The proximity is crucial because in the event of a chemical spill, fire, or any incident that requires immediate decontamination, every second counts. By having a safety shower within this distance, individuals can quickly reach the shower to flush harmful substances from their bodies, minimizing potential injuries and the severity of chemical exposure. This standard is in place to enhance safety protocols in laboratory environments where flammable gases and other hazardous materials are used.

The other options do not align with safety guidelines; for example, placing the shower at the lab entrance or only near the building exit may result in delays in reaching the necessary safety equipment. If situated too far away, as suggested by other choices, it could hinder immediate response efforts during an emergency.