METHOD FOR REDUCING NOISE OF AIR CONDITIONER, FAN UNIT AND APPARATUS, PRESSURE PULSATION REDUCER OF REFRIGERATION CYCLE UNIT, PRESSURE PULSATION REDUCER OF PUMP UNIT AND PRESSURE PULSATION REDUCING METHOD OF APPARATUS

摘要

An air conditioner ensuring a sufficient noise reduction effect in low frequency region of several hundreds Hz or below, characterized by comprising a heat exchanger performing heat exchange between air and refrigerant of a refrigeration cycle, a fan unit for supplying air to the heat exchanger, an air duct for installing the fan unit and passing a sound wave, and a plurality of small holes for blowing a jet flow into the air duct or sucking a jet flow from the air duct by the pressure difference between the blowing side and the sucking side of the fan unit.