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The exhaust hose(s) should alwaysbe used in cooling mode. The air intake hose can be used to increase the cooling efficiency of the unit. If the air intake hose is not used, simply cover one of the grated adapters on the plastic window kit with a vent cap. © I O Q 1. Plastic window kit..............................2 pieces 2. Grated adapter..................................2 pieces 3. Screws..............................................8 pieces 4. Duct connector..........................