An insurance advisory organization that provides standards for rating a building's fire risk based on its distance from hydrants and fire departments said it has revised its classification system.

The Wheaton, Ill.-based American Association of Insurance Services explained that in September it plans on expanding the number of classifications it provides under its “simplified” fire protection classifications from three to five.

Since the late 1970s, the AAIS method allowed insurers to place a risk in one of three fire protection classifications:

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