Heat and cold insulation for the heat exchanger Venom of rigid polyurethane foam in the form of slate. The lagging has a cylindrical shape corresponding to the geometry of the insulated surface. Complete insulation consists of two half-shells with longitudinal and frontal locks, which, when folded, eliminate gaps, facilitate assembly and can be repeatedly mounted and dismantled using straps and clips. Price for products up to +150 C on individual request.