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Class A,B,C and D types of fire
Class I standpipes serve a 2.5-inch fire hose connection for fire department use. These connections must match the hose thread utilized by the fire department and are typically found in stairwells of buildings.
Class II standpipes serve a 1.5-inch fire hose connection and are typically found in cabinets. These are intended for trained occupant use and are spaced according to the hose length. The hose length and connection spacing is intended for all spaces of the building.
Class III standpipes have both connections of Class I and II. Many times these connections will include a 2.5-inch reducer to a 1.5-inch connection.
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