Two new models of duct heaters are now available from Greenheck. Model IDHB is configurable for most applications in sizes up to 36-by-36 inches. Model IDHC is customizable with enhanced features and a 475-kilowatt heating capacity, officials say.

Both models feature 50- or 60-hertz design, fan interlock, a power terminal block, a control board, an automatic limit switch for primary over-temperature protection and a manual reset limit switch. Typical applications include space, primary, secondary, auxiliary and reheating.