The Hydro-Tech Includes Many Standard Features Found Only In Higher Priced Products. 2-Speed Blower Operation In The Summer: The Hydro-Tech Removes More Moisture From The Air By Operating On A Lower Speed For Up To 10 Minutes Before Quietly Switching To A Higher Speed. An Even Higher Speed Is Also Available For High Static Applications. Having The Smallest Footprint Of Any Product In Its Class EnsuresA Perfect Fit When Replacing Older Models In Tight Closets(Even The 036 Model Is Only 21.5 Wide By 21.5 Deep!). Blower Assemblies Are Field-Reversible 180-¦ (ExceptModel 040). This Option Can Improve Airflow When The Units AreInstalled In Closets with Very Little Room For Supply Plenums. Optional Vacated Premises Control (Vpc) Kit with Reset Feature Ensures That The Unit Will Operate A Minimum Of One or Two Hours Per Day During Extended Periods Of Unoccupancy. This Option Also Includes An Automatic Reset Feature. If A Fault Occurs, The SystemWill Shut Down, But Then Automatically Reset Every 24 Hours. If TheSame Fault Exists Each Day, The Unit Will Lockout On The Fourth DayAnd Have To Be Manually Reset. Superior Insulation: Fully Insulated with 3/4' Tuf-Skin Rx, Which Offers Greater Sound Absorption and Better Thermal Efficiency. The Insulation Has A Special Acrylic Coating That's Formulated with An Epa Registered Anti-Microbial Agent. Removable Discharge Flange: Provides Additional Installation Clearance. Tool-Less Filter Rack Installation: Can Be Installed After The UnitIs In The Closet, Providing Additional Installation Clearance. State-Of-The-Art Digital Control Module Additional Standard Features: 100% Factory Tested! R-410A Refrigerant - All Units Operate with Environmentally Friendly R-410A Refrigerant. Non-Corrosive Thermoplastic Condensate Pan - Sloped For Positive Drainage High and Low Pressure Service Ports Refrigerant Filter-Drier and Discharge Muffler Panel-Mounted FPT Water Connections - No Back-Up Wrench Needed. Removable Panels For Service 50 VA Transformer 1' Throwaway Filter Optional Features: Cupronickel Coaxial Heat Exchanger Vacated Premises Control E-Coated Air Coil Corrosion Protection Compressor Cover: A Heavy Duty, Insulated Compressor Cover That Reduces Unwanted Compressor Noise (Must Be Field Installed On The WSVC Unit Before The Unit Is Installed In The Closet).