APC NetShelter AR8122BLK 1U 114kg Fixed Rack Shelf Black PPP2820 fan featuring a robust power design MMGH883 SS883 + MMSI900LEDHS 2 featuring a robust power design with high quality power stages featuring an energy efficient DC brushless motor that provides powerful airflow while maintaining whisper quiet operation suitable for living areas and bedrooms The APC NetShelter AR8122BLK is a heavy duty 1U fixed shelf designed to support non rackmount equipment within standard 19 inch four post enclosures this 660 mm deep shelf promotes continuous front to back airflow to maintain optimal thermal management for active hardware placed on or beneath the tier