Molding apparatus (1) comprising:a molding station (3) equipped with a machine (4) for molding containers (2) obtained from parisons of plastic material and drive components (5) of said machine (4);an isolation device (6) for the molding machine (4), suitable for defining a controlled-contamination environment (7) for housing the machine (4), said drive components (5) being situated outside said environment (7);at least one service section (19) having one or more points of access (19a) with seal-tight protection to enable adjustment, maintenance or size change operations to be performed inside the controlled-contamination environment (7);molds (11) fixed to said machine (4);tubular bodies (13) disposed partly inside and partly outside said environment (7), said tubular bodies (13) defining tubular cavities suitable for the passage of the drive components (5), in particular of drive members (12) for opening and closing the molds (11).