Heating Blanket, 7L, 300 Watts, 23" x 3", WITH VELCRO. Chemglass's heating blankets are available in a variety of sizes for use with Chemglass's spinner flask and bioreactor vessel lines. A male IEC connector is provided for easy connection to either modular temperature controller or Chemglass's Celltrol II control system. Vessel must be stirred when heating blankets are in use, heating at 5 watts per square inch.