Abstract: A non-powered ventilator that prevents backdraft by forming a vortex forming area by internal and external airflows so as to smoothly exhaust indoor airflow to outside is proposed. The non-powered ventilator includes: a fixing member provided with a fixing flange part; a finishing cap part provided with a finishing cone part, an opening part, and a finishing flange part forming fastening holes; a discharging cap part respectively provided with a discharging cone part, a bent edge part, a discharging flange part, and fastening holes; a backdraft prevention member provided with a hemispherical curved plate body, at least three support legs, and opening parts, and a first bent part as well as a circular groove; and fastening members fastened and assembled by bolts and nuts through the fastening holes of the discharging cap part, the backdraft prevention member, and the fixing member.

Abstract: A non-powered ventilator that prevents backdraft by forming a vortex forming area by internal and external airflows so as to smoothly exhaust indoor airflow to outside is proposed. The non-powered ventilator includes: a fixing member provided with a fixing flange part; a finishing cap part provided with a finishing cone part, an opening part, and a finishing flange part forming fastening holes; a discharging cap part respectively provided with a discharging cone part, a bent edge part, a discharging flange part, and fastening holes; a backdraft prevention member provided with a hemispherical curved plate body, at least three support legs, and opening parts, and a first bent part as well as a circular groove; and fastening members fastened and assembled by bolts and nuts through the fastening holes of the discharging cap part, the backdraft prevention member, and the fixing member.

Abstract: A stationary ventilating device for efficiently exhausting airflow converged above a plurality of airflow-guiding plates which are stacked up and assembled together is disclosed.

Abstract: A stationary ventilating device for efficiently exhausting airflow converged above a plurality of airflow-guiding plates which are stacked up and assembled together is disclosed.

Abstract: An adapter automatically controlling a power supply for an air conditioning apparatus by a sensor and individually formed outside of a power supply unit and an air conditioning apparatus, including a single or plural output terminals switching with an input power plug by a gas detecting control circuit installed in the adapter; a composite gas sensor operating the gas detecting control circuit; and a detection reference value preset volume controlling an operating range of this composite gas sensor.

Abstract: The fixed type ventilator according to the present invention includes: a support at the base with openings at the top and bottom; a first air current guide plate with an inclined surface with an angle of inclination of approximately 120° to 130°, which has an opening therethrough, and is coupled over the support; a second air current guide plate, with an inclined surface with an angle of inclination of approximately 120° to 130°, is coupled over the first air current guide plate with a gap of approximately 5 to 10 cm between the second air current guide plate and the inclined enclosed surface of the first air current guide plate. An air passage for the indoor air is provide through the bottom opening of the support and the gap, and natural outdoor air is allowed to flow therethrough the gap of the ventilator.