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The main T’s and cross T’s are punched to easily frame for nominal 2’x2’ and 2’x4’ type G and F light fixtures. USG manufactures 15/16” faced cross T’s to accommodate type G fixtures, and 50” and 26” cross T’s to frame openings for type F fixtures.

Complete light fixture installation details can be found in USG publication AC3152, USG Drywall Suspension Systems Catalogue.