Airborne spores can cause mold to grow in damp and unventilated areas, such as basements. Examples include high altitudes and unventilated, confined spaces. Five inside rooms on each floor have window in unventilated hall. At least 100 prisoners were pushed into each of the unventilated boxcars. Their berthing was the worst on board, in a roach-infested, filthy and unventilated cargo hold. Sharp curves and long unventilated tunnels were a feature of the line built. Later versions used unventilated disks, with four piston calipers on the front.