It is equipped with automatic overpressure control in the cooling section to
compensate for pressure fluctuations between the washing room, tunnel and the
sterile room. When the air pressure has fluctuation, it avoids influence to LAF
and sterilizing effect.
Flowing direction of air in tunnel is from sterilizing zone to preheating zone, from
sterilizing zone to cooling zone. Differential pressure distribution is: preheating
zone < sterilizing zone > cooling zone.