Hg-grid 8′ main 312-00, white – 30/case hg grid is durable and engineered for high-humidity rooms, class a fire – rated. Made of high-grade pvc that doesn’t rust or show scratches. Grid system works with any standard 2ft x 2ft or 2ft x 4ft ceiling tile. Coordinating items include 2ft cross tee, model #320-00 or 320-07 and 8ft wall bracket, model #350-00 or 350-07, and 8ft main, 312-00 or 312-07 and hold down clips 300-00 are optional. features engineered for high-humidity or corrosive environments class a fired rated works with most standard 2′ x 2′ or 2′ x 4′ ceiling tiles case qty: 30