2.2.1. Product features•• Low-noise design improves comfort in surroundingareas1. The noise-suppre ssing winglet fan is a result of newresearch into vane design theory. The unique curvedshape suppresses the generation of vortexes, thusreducing air flow noise.2. The adoption of double-orifice rings reduces airpassage resistance.3. Strengthening of the noise insulation materials in thecompressor and the sealing-in of mechanical noiseallows vibration noise to be greatly enclosed andsuppressed.4. The heat exchanger has an L-shaped design to allow airto flow more smoothly.5. Noise is automatically reduced further during night-timeoperation with lower outdoor air temperatures .2.3. Greatly improved workabilityincreases system renewalcapability•• Pipes that are one size larger can also be connected forrenewal.−− If renewing the system, existing refrigerant pipes can beutilized so that only the indoor and outdoor units need tobe replaced.−− For example, liquid and gas pipes from 10 years agocan be connected to current pipes with the same size orone size larger. Effective utilization of materials reducesworking time and trouble. (Adaptor sockets are notsupplied.)2.2. Low-noise outdoor units5CASSETTE TYPE