Supco's SH282 3W 120V 18' Door Heater is Designed for Continuous use to Protect Drains by Eliminating Frost Build-up on Doors and Cabinet Fronts and Preventing Moisture on Glass Display Doors. This Product cannot be Cut, Spliced, Extended, or Altered in any way. Typical Applications Include Drain Pans, Drain Troughs, Mullions, Commercial and Domestic Refrigeration, Spot Heating, and Commercial and Domestic Refrigerator and Freezers