Submittal

WW-CPWP-09, Rev.0, 09/2009

Deploying a Vertical Exhaust System

to Achieve Energy Efficiency and Support Sustainability Goals

VES Design Considerations

The decision to deploy a VES has multiple implications for layout of other data center elements. First, data

center stakeholders need to analyze the layout of the entire physical infrastructure (both facilities-related and

cabling-related elements) to determine how best to keep overhead room space free from obstruction. Second,

stakeholders should maximize system performance by optimizing cable management within the cabinet: in-

cabinet airflow can be hampered by poor cable management in server cabinets where power and data cable

congestion can block server exhaust fans and obstruct airflow through the VES.

Optimize Room-Level Layout

Several room-level factors need to be considered for effective VES deployment. Designers should route data

cable pathways overhead at the front of cabinet enclosures, leaving the rear of the cabinet open for physical

placement of the vertical duct above the hot exhaust area. Only the front area above the cabinet should be used

for overhead copper and fiber cabling pathways. This should be carefully designed to ensure sufficient cabling

capacity for the entire row of cabinets (see Figure 3a).

An additional challenge for data center stakeholders is integrating the VES layout with lighting and fire

detection/prevention systems. Infrastructure layout decisions are commonly made during the data center design

phase in consultation with facilities experts, with lighting and fire systems positioned to attain maximum

coverage throughout the room and in compliance with local codes. In retrofit applications the VES must be

integrated with existing lighting and fire suppression designs to maintain the effectiveness of those key systems.

Once the vertical duct unit is placed in position, it should be sealed at the points of transition (i.e., ceiling

plenum and cabinet) to prevent hot exhaust air from being released into the data center and recirculating (see

Figure 3b). Cable entry points at tops of cabinets also should be sealed to prevent hot air leakage and

recirculation.

Figure 3a. Effective Location of Overhead Cabling

Pathways in Relation to Panduit VES

Figure 3b. Solid Rear Doors Prevent Hot Air

Recirculation