An industrial oven includes an oven chamber configured to receive a plurality of work pieces. A heater box of the oven has a heating element therein operable to heat air for delivery to the oven chamber. A circulation system of the oven is operable to force hot air from the heater box into the oven chamber. The circulation system includes a delivery manifold extending from the heater box to the oven chamber. A duct has an inlet coupled with an outlet of the delivery manifold, and the duct has a plurality of hot air outlet apertures therein for expelling hot air into the oven chamber. The duct is constructed of fabric sheet and suspended within the oven chamber.