Open coil heaters are used as last heater in ventilation systems or in fresh air systems to heat outdoor air. In addition they can be installed to fresh air outlet of heat recovery systems to cover additional heating need. Duct type heaters are manufactured as rectangular, circular, or standart shape according to the type of duct.

Duct type heaters can be installed to the duct system without using any additional part. Open coil heaters can be used safely in raw material drying, textile fabric drying, marmor epoxi drying, package print drying and in food drying. 

As depending on applied process working temperature can be limited through a bimetal thermostat. Finned heaters are preferred because of their easy installation. These type of heaters are designed and improved by SER engineers and they have long life and wide usage field.