Fire Magic 3648F Protective Grill Covers stainless_steel_tub Ventilation Can Be Halted During Ventilation Can Be Halted During Vacancy DehumidificationDehumidifies At A Rate Of 5 6 Pints Per 24 Hours (Based On Cfm Level) Boost Heat OptionProvides Supplemental Resistance Heat In Heat Pump Mode Heat & Freeze SentinelsKeeps The Room From Overheating Or Freezing Electronic Temperature LimitingPrevents Expensive Over Cooling Or Over Heating Of The Room Electronic Touch Controls With Led Display May Reduce The Need For Individually Ducted Rooftop Systems Because Makeup Air Increases Room Btu Load Requirements And Requires Additional Ptac Cooling Or Heating 75 In Wall Sleeve Custom fitted to Fire Magic grills and accessories these black covers are manufactured with a PVC exterior and Polyester "breathable" interior providing excellent protection to any Fire Magic product