Improves Cooling Efficiency in Your Data Center Where Airflow Management Is Key. This SmartRack® SRTHERMDUCTMD is an adjustable three-piece venting and cable management system that fits on top of your standard-width, standard-depth 42U or taller rack enclosure. The thermal duct kit allows heat built up in a typical rack configuration to be vented upwards into your facility’s return air duct or other standard ventilation system, helping your equipment perform at its peak while reducing your facility & rsquos cooling and energy costs. Mounts to the Roof of Your Rack Cabinet. To help your rack equipment perform at its peak while reducing your cooling and energy costs, the SRTHERMDUCTMD mounts on top of your enclosure and connects to your facility’s CRAC or HVAC air return system. Included panels and seals help secure the rack to allow proper airflow. The chimney adjusts in height from 17 to 28 inches. The kit works with all standard-width, standard-depth full-height SmartRack enclosures. All assembly hardware is included.