US 12,134,893 B2
Acoustical ceiling system
Peter J Oleske, Lancaster, PA (US); and Stephen G Mearig, Lititz, PA (US)
Assigned to AWI Licensing LLC, Wilmington, DE (US)
Filed by ARMSTRONG WORLD INDUSTRIES, INC., Lancaster, PA (US)
Filed on Nov. 4, 2020, as Appl. No. 17/089,247.
Claims priority of provisional application 62/931,081, filed on Nov. 5, 2019.
Prior Publication US 2021/0131101 A1, May 6, 2021
Int. Cl. E04B 9/00 (2006.01); E04B 9/04 (2006.01); E04B 9/18 (2006.01); E04B 9/24 (2006.01); E04B 9/34 (2006.01)
CPC E04B 9/001 (2013.01) [E04B 9/0435 (2013.01); E04B 9/18 (2013.01); E04B 9/241 (2013.01); E04B 9/34 (2013.01); E04B 2103/02 (2013.01); E04B 2103/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A suspended ceiling system comprising:
a ceiling grid comprising:
a first support;
a second support;
the first support is vertically offset from the second support by a first offset distance;
a first panel supported by the first support, the first panel comprising a first exposed major surface opposite a second exposed major surface, the first panel exhibiting an Noise Reduction Coefficient (NRC) value ranging from 0.3 to 0.99;
a second panel supported by the second support, the second panel having a first exposed major surface opposite a second exposed major surface, whereby no line of sight exists between the first and second exposed major surfaces of the second panel;
wherein the second exposed major surface of the first panel faces the first exposed major surface of the second panel, and the second exposed major surface of the first panel is vertically offset from the first exposed major surface of the second panel by a second offset distance;
wherein the first offset distance and the second offset distance are each positive non-zero values; and
wherein the second panel has a different airflow resistance than the first panel.