The Vertical Exhaust Duct, a component of CPI Passive Cooling Solutions, isolates hot air and removes it from the cabinet into a drop ceiling. Chatsworth T-Series Features Available in standard sizes to fit most applications – 24″ (610 mm) or 27.3″ (693 mm) wide; 78″ (42 RMU) or 84″ (45 RMU) heights; 22″ (574 mm), 30″ (760 mm), 36″ (910 mm), 39″ (990 mm) or 44 (1120 mm) usable depths.