Transit Heaters RCH1 – Fan Forced Electric Calvane™ Cab Heater RCH2 – Fan-Forced Electric Open Coil Cab Heater RCH3 – Fan-Forced Electric Tubular Cab Heater PXFT – Convection Heater (Natural) PH – Enclosure Heater (Fan-Forced) DFF – Overhead HVAC Heater – (Finned Tubular Elements – Calrod® type*) DIF – Overhead HVAC Heater – (Non-Finned Tubular Elements – Calrod® type*) DOF – Overhead HVAC Heater (Open Coil) CX – Screwplug Immersion Heater Threshold Heater (CALBAR™) FV – Calvane™ Transit Car Floor Heater RCH4 – Fan-Forced Transit Car Floor Heater SD – Strip Transit Car Floor Heater