Abstract: Machine for packaging products with stretch film the flaps of which are stretched, folded and mutually superimposed on the bottom of the product usually arranged in a tray, comprising a final station with a motorized heat-sealing conveyor to mutually secure said flaps with a heat-sealing operation, characterised in that this final heat-sealing station is provided with an upper protective chamber for the operator, and which limits the loss into the work environment of heat produced by said heat-sealing conveyor, now incorporated in this protective chamber, which has a shape and size such as to allow the packaged products to be conveyed therethrough without interference, this protective chamber being provided with an inlet opening usually communicating with the casing of the packaging machine and being provided with an outlet opening for conveying the packaged products, wherein at least this last outlet opening is closed by a swinging barrier that prevents loss of heat towards the outside and that is arranged t