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Do Whirlwind zees and cees meet proper specifications?

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Do Whirlwind zees and cees meet proper specifications?

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100% of Whirlwind’s material used for zees and cees is run from coils conforming to ASTM A1011, Grade 55 (red oxide) or ASTM A653, Grade 55 (galvanized). This material meets the Light Gage Structural Institute (LGSI) requires.

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