Biosafety Inflatable Seal Door suitable for high-level biosafety laboratories such as BSL-3/4 and ABSL-3/4,meeting high airtightnessrequirements. Available in single-bladder and dual-bladder configurations. The dual-bladder model is equipped with on-site airtightness self-test function. Working principle: After the door is closed, the inflatable seal strip is inflated and expanded to form a tight seal between the door and the frame; before the door is opened, the seal strip automatically deflates and retracts to avoid wear. Constructed with full stainless steel seamless welding, it is resistan