These Air Conditioner systems use R-417A refrigerant, an environmentally safe, green gas. Outstanding features include high-velocity motors with no overhang for a compact footprint plus a stainless-steel drain pan and pre-installed return air filter that can be easily removed and cleaned. Systems come complete with a seawater pump plus all the pieces and parts you need (from seawater intake to supply air grille) for a professional installation. Duct routing is made easy by blowers that rotate to horizontal or vertical positions. Operation is simple, with a two-knob mechanical switch for reliable control over air conditioner functions. Optional Dual Duct Kit can be used to create an additional air outlet for 6,500 to 15,000 BTU/hr models. Reverse Cycle: No. Discharge: Horiz. or Vert. Included Equipment: Two-knob control, seawater pump, seawater hose, stainless hose clamps, strainer and speed scoop inlet, overboard discharge, ball valve, ducting, supply and return grilles, PVC plumbing fittings, electrical terminal connectors. Refrigerant: R-417A