Two to nine fansPossible to install in 19" extrusions - horizontally or in top or bottom frame of distribution rackConnecting kit for ventilation unit is needed when installing in top or bottom frameTemperature range -10℃ - 55℃Thermostat in the range 0℃ - 60℃ includedOption of no thermostatColor powder coated RAL (standard RAL 9005)