- The Issue A and B Window Type Exposure Protection Sprinklers are intended for spraying water on window glazing at prescibed spacings and sprinkler locations at a minimum discharge pressure of 7 psi (0,48 bar).
- Exposure (Outside) Protection Sprinklers are utilized to provide protection from exposure fires on the outside of buildings.
- The smaller orifice Issue A Sprinklers are normally used where exposure is light or moderate, the area of coverage is small, or where one horizontal line of window sprinklers is installed at each floor.
- The larger orifice Issue B Sprinklers are normally used where exposure is severe, or where one horizontal line of sprinklers is used to protect windows at more than one floor level.
