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Good price and quality air tight door is often used in the medical industry and places with high air tightness requirements. How can it achieve high air tightness? Good price and quality air tight door products are designed to avoid direct convection between the partitioned space and the external indoor air, resulting in some pressure difference in the partitioned space, that is, the gas pressure in the partitioned space is smaller than the external gas pressure. Therefore, the external pressure of indoor air acts on the door to firmly close the door, so as to ensure the excellent tightness and impermeability of the partitioned space, Thus, the pollution of the isolated space to the outside is reduced.