How to choose CVD furnace?

Temperature

1200℃, 1400℃, 1700℃, 1800℃

Tube dia and heating length section

Tube dia(40, 60, 80,100mm);heating length section(205, 350,440mm)

Equipment temperature zone

Single, double,three

Note

Please specify the vacuum required, how many channels of air supply system, float flowmeter or proton?