Manufacturer: M & I Air Systems Site: Bell South Switching Center - Marietta, Georgia Size & Application:  21,000 CFM (70% redundancy) Total Tons: 42,000 Equipment Features:  Direct drive controllable pitch vane axial fans No belt maintainance Compact design with 3 sided coil intake Roll out fan assembly Acoustical 90 degree outlet silencer NC-37 Project Specifics:  Project required installing additional air handlers in existing space which was limited. The M & I Space Compact design with three cooling coils on three sides of the unit allowed twice as much air flow in half the space compared to conventional units.