A humid air stream generator is disclosed. The humid air stream generator comprises a hollow cylindrical chamber (2) with a mist generator (21) placed inside at the bottom of the hollow cylindrical chamber (2) for generating a continuous stream of humid air, an inlet tubing (22) attached to the hollow cylindrical chamber (2) for feeding a stream of incoming air, an outlet tubing (8) attached to the hollow cylindrical chamber (2), a suction fan (4) placed between the outlet tubing (8) and the mist generator (21) for forming the continuous stream of humid air with the stream of incoming air into a cyclonic air flow which spiral upward towards the outlet tubing (8), so as to eliminate accumulation of water droplets or condensation at an outlet region of the hollow cylindrical chamber (2).