When some equipment in the rack heats up a lot, then it is better to use a 19″ mounted fantray on the spot with a lot of heat. This fantray exists in 2 versions: with 3 fans and with 6 fans.
Axial fans, ball bearing with service life of 25000 h at 25?C, UL approved, with optical indicator
in the aluminium frontpanel.
Air flow 486 m?/h for IVU3. Noise 55 dbA.
Air flow 972 m?/h for IVU6. Noise 57 dbA.