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STEEL DOOR INSTITUTE J S D I Recommended JJ for JJ Q To establish guide

J Standard steel doors are classified in four levels Level 1 1 and 1 standard duty Level 2 1 heavy duty Level 3 1 extra heavy duty and Level 4 1 maximum duty Each of the four levels noted above offer a range of construction models and desig

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STEEL DOOR INSTITUTE J S D I Recommended JJ for JJ Q To establish guide






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