FIELD: sealing-up door apertures and hatches of refrigerating cabinets and thermoclimatic chambers. SUBSTANCE: sealing unit includes elastic envelope and consists of two chambers separated by flat flexible partition. First part to be sealed-up has blind slot narrowing towards second part to be sealed-up one chamber of envelope has form of slot is received by this slot. Other chamber is engageable with second part to be sealed-up Edges of slot are positioned for compression of flat partition. Chamber of envelope may be filled with flexible material and/or flexible inserts. Blind slot may be formed by bent edges of two sheet members of first part. Projection is provided over contour of edge towards second part. Wall of slot near edge has shoulder. EFFECT: simplified construction; facilitated manufacture; enhanced stability and tightness of seal. 8 cl, 4 dwg
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