Qualified to operate or assist in operating all heating and ventilating equipment, engines, turbines, motors, combustion engines, pumps, air compressors, ice and refrigerating machines, air conditioning units, fans and siphons on the site assigned . Founded in 1909, ABM serves over 20,000 clients, with annualized revenue approaching $8 billion and more than 100,000 team members in 350+ offices throughout the United States, United Kingdom, Republic of Ireland, and other international locations.