... Round air outlet connected with flexible pipe 6'8"Bathroom Exhaust fan/ventilation fan1. Low noise, little vibration 2. ... connected with flexible pipe 3. Metal or plastic pipe availableBathroom exhaust fan/ vent fan/ air exchange fan/ ventilator1. Low ... windows ceiling. for conference rooms, restaurant, receptionroom, bathroom etc3. Exhaust effectively indoor polluted air, wet gas, smoke, dust4. Round ...