Storage Sprinklers. Control Mode Density Area (CMDA) Early Suppression Fast Response (ESFR).For example for storage applications the standard sprinklers used in CMDA, ESFR, and CMSA range between 100-130 square feet of coverage per sprinkler head. … EC-25 is a sprinkler head, which is a subcategory of the CMDA and CMSA sprinkler system in that it uses standard densities.Control Mode Specific Application Sprinklers. With a large variety of K factors to choose from, CMSA sprinklers have been developed to accomplish the main benefit of the ESFR: eliminate the use of in-rack sprinklers in high challenge storage applications. The difference is control versus suppression.

These spray sprinklers are listed at a minimum operating pressure and with a fixed number of calculated flowing sprinklers for a defined storage scheme and/or a type of commodity. There is no interpretation of curves or charts to decide on the density or design area. Limitations of building height, storage height, commodity type, storage arrangement, sprinkler temperature rating, sprinkler spacing, etc., are all specified in the listing or approval of the product. Fire testing is conducted for the exact approvals desired.

Current approvals for CMSA sprinklers include: Class I-IV, cartoned unexpanded plastics in solid piles, palletized, shelf or bin box, open frame racks, and solid shelves with certain limitations.

The manufacturer’s engineering data sheets must be followed exactly for commodity approval, restrictions of maximum and minimum spacing, clearance to commodity, obstruction requirements, hose stream allowances, water supply duration, deflector distance to ceiling, sprinkler temperature requirements, and any other design and installation criteria.