FIELD: non-ferrous metallurgy. SUBSTANCE: invention can find use in design of anode gears of electrolyzers with upper current supply and self-baking anode. Gas collection unit has anode enclosure with belt and skirt in lower part, gas collector made of separate sections having horizontal flange, bracket and edge joined by separable joints and sealing member produced from heat-resistant material. Bracket has hole to accommodate attachment member and to fix it to belt of enclosure. Each section has edge arranged perpendicular to horizontal flange. Sealing members are laid between them and belt of enclosure. Sections are attached to belt with the aid of eccentric locking arm and rest or wedge which makes it possible to press sealing members both horizontally and vertically. EFFECT: prolonged service life of belt of anode enclosure thanks to reduced jacketing for warmth-keeping and raised degree of sealing in belt zone. 4 cl, 2 dwg
