KINGDEL Powerful Mini Desktop Computer, Fanless Industrial PC, i5 Dual Core CPU, 8GB RAM, 256GB SSD, 2xNICs, 4xUSB 3.0, 4xCOM RS232, HD Port, WiFi, Metal Case, Silent Working

CPU ProcessorCore i5-3317U, 2 Cores/4 Threads, Base Frequency: 1.70GHz(Max 2.60GHz), 3MB Smart CacheGPUHD Graphics 4000, Graphics Base Frequency: 350 MHz, Graphics Max Dynamic Frequency: 1.05GHzRAM1*DDR3L Slot Support 4GB/8GB DDR3L, DDR3L-1600, DD3L-1333, LPDDR3-1600, LPDDR3-1333SSD1*mSATA Slot, 1*SATA3.0 SlotHDDSupport 2.5'' HDDCOM Port4*COM RS232USB Port4*USB 3.0, 4*USB 2.0Video PortHD and VGAOther Port2*82574L Giga LAN Ports, 1*MIC/SPKDimensions8.35 (L) x 5.91 (W) x 2.01 (H) inchesWeight3.04 poundsPower SupplyInput: AC100~240V; Output: 12V, 5AOperating Temperature0°C-70°CStorage Temperature-20°C-85°CRelative Humidity10%~85%(non-condensing)Other FeaturesCalls on function automatically, Wake-On-LAN 1Dual Display2RS232 COM Port3Fanless Design4HD Graphics5Support Multiple OS Could I use it in environments with a really dusty?
Yes! No fans or moving parts so it should last a long time even with the dust and hot/cold.

Can I install other OS after I get my computer?
Yes, you can.

Will the mini pc be very hot when it's running without a fan?
This pc is fanless, and the CPU contacts the case directly, the case itself is a heat sink.
When it works, it likes a radiator to dissipate heat on its own to protect the device.
It can be relieved to use, as long as the temperature is under 90°C.

KINGDEL Fanless Industrial Mini PC i5 Dual Core CPU, 4*COM, Full Metal Case KINGDEL NC1037 i5-3317U Industrial Powerful Mini PC Specifications HD Graphics 4000 Could I use it in environments with a really dusty?
Can I install other OS after I get my computer?
Will the mini pc be very hot when it's running without a fan?