tube material
stainless steel,carbon steel,copper
fin material
stinless steel,carbon steel,copper, aluminum
fin type
spiral type, extruded type or plate type
connector
flange or thread or others
making standard
GB/T14296-93
structure of heat exchanger
fin tube structure, tubular structure or plate structure
surface treatment
galvanized or silver powder or black powder
flow curcuit
3 or 4 or 5 flow pathes or others
base tube
16mm, 18mm, 21mm, 25mm or customized