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Sprinkler type under stair

Question asked by gurug5 on Dec 28, 2016
Latest reply on Dec 29, 2016 by nocivus

Room protected by Tyco EC-14 extended coverage sprinkler heads has an exposed stair from 1st to 2nd floor and another exposed stair plus landing from 2nd floor to the roof.  The entire structure is noncombustible.  Do I need to use the same EC-14 heads under the stairs or would a standard 5.6K upright be sufficient?  The one stair also has a section toward to bottom of the stair blocked with a rail to prevent storage.

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