The Ives Architectural Hardware Products Catalog states for the 3SP1 hinge;
Maximum door weight 120 lbs, max door width 36"
Maximum labeled door size - 3'0" wide x 7'0" x 1 3⁄4" thick as set in NFPA 80
Reference the 3SP1 Installation Instructions for details on how many spring hinges and in which locations to use spring hinges.
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