Abstract: In the dryer section of a paper machine, the paper web is pressed against the dryer cylinders by means of an air-permeable endless dryer fabric. A ventilator apparatus extends transversely across the paper machine located outside the pocket above and below the fabric turning rolls. Air from the ventilator is forced into the pocket through the fabric in the nips formed by the fabric and the fabric turning roll. This air dilutes the moisture driven from the sheet by the dryer can. The ventilator apparatus also creates a negative pressure region to exhaust air from the pocket. This exhaust air is used to scour the boundary layer of moisture laden air from the incoming fabric. The two-pass ventilator apparatus has two individual chambers separated by an induction chamber. The primary chamber contains multiple air jet nozzles. The blowing directions of the two longitudinal nozzles may be at different angles with respect to the running direction of the dryer fabric.