This National 4-feet air curtain is a fan-driven device used above doors to efficiently separate two different environments by creating an invisible air barrier. This air curtain is designed with a 140W rated power to operate. Generally, this air curtain is used in large areas like auditoriums, assembly halls, and mosques to balance the air temperature in the room when a door is opened. It can be operated by remote control and manual system. High-Speed Air Barrier: It makes a strong, invisible air curtain that separates the indoor and outdoor areas. This air barrier blocks the environment from passing from indoor to outdoor as well as from outdoor to indoor. 1650m³/H Air Flow: With strong airflow performance, this curtain helps to maintain stable indoor temperatures and improve air circulation. Dual Temperature Zone Separation: Helps ...