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The USG Ceilings Plus® Open Plenum Modular Acoustic System is an elegant and durable linear metal ceiling system consisting of variable width and height baffles. It is a fully accessible panelized cassette system with torsion spring grid attachment and is pre-engineered to reduce lead times. It offers acoustical performance utilizing perforations and sound absorbing materials, including Ultrasorb. Varied mounting arrangements or field modifications are available to respond to installation requirements and the system is Class A per ASTM E84 with zero flame spread and a non-combustible aluminum core. While customizable, this LCA studies covers the 4 standard baffle sizes: 1x3, 2x1.5, 2x6, and 2x8. Additional information and design options are available at usg.com and cgcinc.com. These products generally fall under ASTM E1264 Section 5.2 designation as Type VII—Perforated aluminum (pan) with mineral or glass fiber base backing. CSI Masterformat number 09 51 33.