Marley; Heater; Qmark; Fan-forced; Temperature Gradient: 42 Deg F; Fin Material:steel; Wattage Rating: 5/3.8/2.5 Kw; Model: Cdf Series; Amperage Rating: 18.1/13.7/9 Amp; Voltage Rating: 277 V; Btu/hr Output: 17.1/13/8.5 Btu/hr; Phase: 1; Wire Size: 10 Awg; Air Flow: 300 Cfm; Heating Element: 80/20 Nichrome Resistance Wire, Enclosed In A Steel Sheath; Enclosure: Recess: 20 Gauge Galvanized Steel Back Box And Phosphatized, Then Electrostatically Painted Navajo White By A Bakedenamel, 20 Gauge Cold Rolled Steel Faceplate, Surface: 20 Gauge Galvanized Steelmounting Plate And Electrostatically Painted Navajo White; Controller Type: Bi-metallic, Snap-action; Mounting: Ceiling; Accessories: Cdfse Surface Mounting Enclosure Only, Cdfre Recess Mounting Enclosure Only, Cdfsenw Surface Mounted Northern White - Dimensions 20 In Length X 16-1/2 In Width X 5-3/4 In Depth, Cdfrenwrecessed Mounted Northern White - Dimensions 23-3/4 In Length X 23-3/