A recycling method and to a plant (10) for manufacturing containers (12) from thermoplastic preforms (14), is characterized in that the plant (10) includes a circuit (60) for recycling the cooling air from the oven (26) including: extraction elements (56), which are capable of extracting the filtered air injected into the interior of the oven (26) by an air-cooling device (34)； and at least one duct (62, 74) capable of bringing all or part of the filtered air extracted from the oven (26) as far as at least one unit (38, 48) of the plant into which the air is injected.
