New imported food grade SUS304 stainless steel shell design, high strength, not burst, deformation, leakage prevention effect is good, environmental protection, safe and durable.

Damper: both gas flow regulating button and wind board are high grade PP material, connected with 304 stainless steel bar, manually adjust the outside valve knob, control air flow.

For welding low-alloy and high strength steel with corresponding strength grade.