Characteristics of Confined Spaces
(3) Portal size.
- (a) Restricted--A portal of 24 inches or less in the least dimension. Portals of this size are too small to allow a rescuer to simply enter the space while using SCBA. The portal size is also too small to allow normal spinal immobilization of an injured e
- (b) Unrestricted--A portal of greater than 24 inches in the least dimension. These portals allow relatively free movement into and out of the permit space.