Properly specifying the wind resistances of asphalt shingles can be more complex than most designers may realize. Further complicating the situation, many building codes currently do not implement asphalt shingles' wind-resistance test methods consistent with how test methods are written.
Wind resistances of asphalt shingles are tested and classified using two test methods: ASTM D3161 and ASTM D7158.
ASTM D3161, "Standard Test Method for Wind-Resistance of Steep Slope Roofing Products (Fan-Induced Method)," is a fan-induced wind method. The current edition was published in 2016 (ASTM D3161-16).