Note A: To determine correct size, deduct 1/4 inch from heating element. I.E. - 18 inch length of duct heating element will measure 17-3/4 inch.
Note B: Stainless steel mounting plate supplied with mounting holes and gasket neoprene.
Note C: Due to the custom nature of most Insert Duct Heaters, call the factory for technical assistance. Insert Duct Heaters are available in any size, KW, Voltage, Phase, or combination of add on accessories.