Additional physical requirements include: ability to climb ladders up to 20 feet in height; ability to climb stairs up to 5 flights at a time; ability to wear negative-pressure respirators for up to 4 hours a day; ability to perform light work in hot environments (100 degrees F) for up to 1 hours/day; ability to wear protective equipment (including, but not limited to hearing protection, hard hat, safety boots, safety glasses or goggles, flame-resistant coveralls, gloves) for up to 10 hours/day; ability to work in a noisy environment (with hearing protection); ability to walk/stand (with occasional breaks) for up to 7 hours/day; ability to work at heights (protected by guardrails and/or personal fall arrest equipment); ability to work in an environment with exposures to magnetic and/or electrical fields, wood dust, coal dust, coke oven emissions, organic vapors, and/or metal fumes (all within OSHA limits). In the course of working at the project site, the employee is occasionally exposed to outside weather conditions, including cold/hot, wet and/or humid conditions, and may work near moving mechanical parts and/or machinery.