Mirra - Linear Ceiling System

Suspended linear metal ceiling

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Perforation Guide

Ceilings Plus has created actual size perforation patterns to be used as a guide for aesthetic selection and performance criteria. The "Perforation Selector Guide" can be ordered <<here>>.
Noise reduction may be achieved by adding acoustical absorbing material. Your acoustical consultant may make specific recommendations. Consult Ceilings Plus for available options.

Acoustical Absorption
Sound Absorbing Materials

Standard
• CP non-woven acoustical liner laminated to panel (0.008"/.2mm thick)
• Average NRC .75
• Class A Status, ASTM E84
• Colors: Black, Dove Gray, White and Natural

Requires minimum 6-7" deep plenum space to achieve results. Not recommended as sole acoustical backing for wall panels.

White fabric backing is not recommended with certain high percentage open perforation patterns. Contact factory for details.

Ceilings Plus has acoustically tested a variety of the perforation patterns offered. ASTM method 423-99A. Reports may be available upon request for professionals. The average NRC is .75 for Ceilings Plus perforation patterns 5% and greater, using non-woven backing.

Optional Fiberglass or Ultra-Sorb Reconstituted Cotton
If higher levels of absorption are desired other substances may be supplied in lieu of, or in addition to, CP non-woven acoustical liner. Some of the approximate ranges of NRC levels are listed below. Consult factory for specific data.

• CP non-woven acoustical liner, .75 NRC
• 1" THK, 1.5# Fiberglass or Ultra-Sorb, .80 NRC
• 1.5" THK, 1.5# Fiberglass or Ultra-Sorb, .85 NRC
• 2" THK, 3# Fiberglass or Ultra-Sorb, .95 NRC

Perforation Types			M E T A L	W O O D
LT-20	.394" Square Holes @ 1.020" Straight Centers	15% Open	X	X
LT-21	.394" Square Holes @ .510" Straight Centers	54% Open	X
LT-22	.413" Square Holes @ .708" Straight Centers	34% Open	X
LT-25	3/8" Round Holes @ 5/8" Staggered Centers	29% Open	X	X
LT-26	3/8" Round Holes @ .530" Diagonal Centers	39% Open	X	X
LT-27	3/8" Round Holes @ .884" Diagonal Centers	15% Open	X	X
LT-28	3/8" Round Holes @ 3/4" Straight Centers	20% Open	X	X
LT-29	3/8" Round Holes @ 1-1/4" Straight Centers	7% Open	X	X
LT-30	1/2" Round Holes @ 1" Straight Centers	20% Open	X	X
LT-31	1/2" Round Holes @ 1" Staggered Centers	20% Open	X	X
LT-32	1/2" Square Holes @ 1" Straight Centers	25% Open	X	X
LT-33	1/2" Round Holes @ .707" Diagonal Centers	39% Open	X	X
LT-34	3/4" Round Holes @ 1-1/4" Straight Centers	28% Open	X	X
LT-36	3/4" Square Holes @ 1-1/4" Straight Centers	36% Open	X	X
*LT-39	1/8" X 1-1/16" Rectangular Holes @ 1/2" X 1-1/2" Straight Centers	18% Open	X	X
*LT-40	1/8" X 1" Rectangular Holes @ 3/8" X 1-1/4" Straight Centers	27% Open	X	X
*OB-10	1/8" X 1-1/16" Obround Holes @ 7/16" X 1-5/16" Straight Centers	23% Open	X	X
*OB-12	1/8" X 1-1/16" Obround Holes @ 7/32" X 21/32" Staggered Centers	45% Open	X	X
*OB-14	1/16" X 1" Obround Holes @ .320" X 1.160" Straight Centers	17% Open	X
*OB-15	1/16" X 1" Obround Holes @ .160" X 1.160" Straight Centers	33% Open	X
*OB-16	1/16" X 1" Obround Holes @ .160" X .580" Staggered Centers	33% Open	X
*OB-18	3/16" X 5/8" Obround Holes @ 7/16" X 15/16" Straight Centers	27% Open	X	X
*OB-19	3/16" X 5/8" Obround Holes @ 7/16" X 15/32" Staggered Centers	27% Open	X	X
RN-10	1/8", 1/4" & 3/8" Round Holes @ Random Centers	15% Open	X	X
RN-20	R1/4", R3/8" & R1/2" 5-Pt Star @ Random Centers	5% Open	X	X
RN-21	R1/4", R3/8" & R1/2" 5-Pt Star @ Random Centers	10% Open	X	X
RN-30	1/4" Square Holes @ Random Centers	10% Open	X	X
RN-31	1/4" Square Holes @ Random Centers and Rotation	10% Open	X	X
RN-32	3/8" Square Holes @ Random Centers	10% Open	X	X
RN-33	3/8" Square Holes @ Random Centers and Rotation	10% Open	X	X
RN-34	1/2" Square Holes @ Random Centers	10% Open	X	X
RN-35	1/2" Square Holes @ Random Centers and Rotation	10% Open	X	X
RN-36	1/4", 3/8" and 1/2" Square Holes @ Random Centers	10% Open	X	X
RN-37	1/4", 3/8" and 1/2" Square Holes @ Random Centers and Rotation	10% Open	X	X
SD-7	1/16" Round Holes @ .175" Diagonal Centers	10% Open	X	X
	Note: Limited to .040 material thickness (or thinner) and 2'-0" x 2'-0" panels (or smaller)
SD-8	.078" Round Holes @ .196" Staggered Centers	14% Open	X	X
SD-9	.078" Round Holes @ .196", .170" Straight Centers	14% Open	X	X
SD-10	3/32" Round Holes @ 3/16" Staggered Centers	20% Open	X	X
SD-11	3/32" Round Holes @ .265" Diagonal Centers	10% Open	X	X
SD-12	3/32" Round Holes @ 3/16" Straight Centers	20% Open	X	X
SD-13	1/8" Round Holes @ 1/4" Staggered Centers	20% Open	X	X
SD-14	3/16" Round Holes @ 3/8" Staggered Centers	20% Open	X	X
SD-15	3/32" Round Holes @ 3/8" Straight Centers	5% Open	X	X
SD-16	3/16" Round Holes @ 3/8" Straight Centers	20% Open	X	X
SD-17	1/8" Round Holes @ .354" Diagonal Centers	10% Open	X	X
SD-19	3/16" Round Holes @ .65", 3/4" Straight Centers	5% Open	X	X
SD-20	3/16" Round Holes @ .265" Diagonal Centers	39% Open	X	X
ST-13	1/8" Round Holes @ 1/4" Straight Centers	20% Open	X	X
ST-14	1/8" Round Holes @ 1/2" Straight Centers	5% Open	X	X
ST-20	1/4" Round Holes @ 1/2" Straight Centers	20% Open	X	X
ST-21	3/16" Square Holes @ 1/2" Straight Centers	14% Open	X	X
ST-22	1/4" Square Holes @ 1/2" Straight Centers	25% Open	X	X
ST-26	1-1/4" Round Holes @ 2" Straight Centers	31% Open	X	X
ST-27	1-1/4" Round Holes @ 2" Staggered Centers	31% Open	X	X
ST-40	5/8" Round Holes @ 1-1/4" Straight Centers	20% Open	X	X
ST-41	5/8" Round Holes @ .884" Diagonal Centers	40% Open	X	X
*Perforation pattern may result in deflection beyond manufacturers recommendation, consult factory for panel sizes. Consult Ceilings Plus for additional perforation patterns available.