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

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briana-ranney

Published 2014-10-03 | 6254 Views

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

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