Characteristics of Confined Spaces
(4) Space access.
- (a) Horizontal--The portal is located on the side of the permit space. Use of retrieval lines could be difficult.
- (b) Vertical--The portal is located on the top of the permit space, so that rescuers must climb down, or the bottom of the permit space, so that rescuers must climb up to enter the space. Vertical portals may require knowledge of rope techniques, or speci