1. Smooth, convenient, safe and reliable opening and closing, and can meet special requirements such as airtightness, sound insulation, and intelligence. 2. Rubber edge sealing is installed on each side of the door panel to fill the gap between the door panel and the door frame. It has excellent air-tightness, plays a role in preventing dust and bacteria, reducing air leakage, and ensuring the gradient distribution of air pressure difference in adjacent rooms; 3. The door leaf observation window is designed with double-layer hollow tempered glass. The slits on the four sides are treated with silicone gel. The slits are very tight and reliable. The inner four corners are treated with arcs or right angles, giving a beautiful and generous appearance. Drying agent can be placed in the observation window to prevent water droplets from adhering to the glass on both sides due to liquefaction caused by moisture in an environment with high humidity. 4. Stainless steel anti-collision belts can be installed on the waist of the door leaf to prevent the cart from accidentally colliding and damaging the surface of the door; 5. Sealing strips are installed for three weeks, and lifting and sweeping strips are installed at the bottom of the door body, which meets the use requirements of the purification industry.