Specifications include, but are not limited to: Unit Airflow Configuration In-row Units The CRAC must be designed and manufactured to be installed within the row of server cabinets where it must draw return air in at the back (from the hot aisle) and discharge supply air at the front (into the cold aisle) via adjustable baffles. In-row units must match the height and depth of the adjacent racks and integrate into the row such that no gaps exist that would allow air to bypass from the cold aisle to the hot aisle. Cabinet and Frame Unit Frame Unit frame must be manufactured of welded steel tubes and must be mill-galvanized or coated with an epoxy finish. Unit Cabinet Exterior panels must be steel sheet, minimum of 20 gage, mill-galvanized or coated with a corrosion-inhibiting epoxy finish in manufacturer's standard color. Mill galvanized sheet metal must be coated with not less than 1.25 ounces of zinc per square foot of two-sided surface. Mill rolled structural steel must be hot-dip galvanized or primed and painted. Cut edges, burns and scratches in hot-dip galvanized surfaces must be coated with galvanizing repair coating. Manufacturer's standard cabinet materials and finishes will be acceptable if equivalent to the above requirements and approved by the Owner. Provide removable panel for access to controls without interrupting airflow. Panels must be gasketed to prevent air leakage under system operating pressure and must be removable for service access without the use of special tools. Provide double deflection supply grilles integral to unit. Grilles must be factory coated the same as the unit cabinet. Cabinet Interiors Sound Attenuation Provide a factory-installed sound attenuation system in the interior of the CRAC cabinet. CRAC cabinet panels interior must be provided with minimum 50 millimeters two inch thick acoustical sound absorbing foam with a minimum Noise Reduction Coefficient (NRC) of 0.85. Compressors located in CRAC interior cabinets must be either wrapped in a sound absorbing insulating blanket or enclosed in its' own sound absorbing insulated mini-cabinet inside of the larger CRAC interior cabinet. Fans and compressors located in the CRAC interior cabinet must be provided with vibration isolators between their respective support frames and the cabinet framing. CRAC manufacturer's standard interior cabinet sound attenuation materials and finishes will be acceptable if equivalent to the above requirements and approved by the Owner.
