These elements are used in quick air heating processes and where quick cooling is also required. These can also be used in oven and dryers with cover guard.
Helical coil of nichrome wire is inserted into porcelain blocks uniformly mounted on insulated metal sheet. Straight wire can also be wound around insulators as required in different applications.
This element cannot be used where corrosive vapour, or moisturised atmosphere is there. There should be proper guards in front of open wires