Staining or Heavy Soiling - Composition units with
plastic film face. Metal pan units. Metal faced
composition units.
Impact Abrasion - Metal pan units. Impact resistant
composition units. Metal faced composition units.
Metal pan units with pads cannot be used when space
above the ceiling is used as an air plenum for
heating, ventilating or air conditioning systems.
Pattern -
1.
Regularly large hole perforated
2.
Randomly large hole perforated
3.
Finely perforated
4.
Fissured
5.
Textured light to medium
6.
Textured heavy
7.
Smooth
8.
Printed
9.
Embossed
10.
Embossed-in-register
11.
Other (specify)
Mineral fiber Type III, IV, IX, and XI acoustical
ceiling units offer a combination of rated fire
resistance, flame spread classification, acoustical
performance, and design versatility. Units are
available in a variety of configurations ranging
from flat panels with simple textured surfaces to
panels with detailed edges or carved patterns and
motifs. Cost generally increases with the
complexity of design and increase of thickness
and/or unit weight.
Fiberglass Type XII acoustical ceiling units are
available cloth-faced and vinyl-faced. The
fiberglass units have high acoustical performance,
thermal insulation value, and moisture resistance
ratings. The cloth faced units are good for
open-office installations and areas such as
libraries that require high acoustical absorption.
The vinyl-faced fiberglass units, because of their
washable vinyl face, are good for use in buildings
with supply and return-air ducts in the ceiling.
Minimum ceiling attenuation class (CAC) formerly
called ceiling sound transmission class (CSTC),
requirement may be modified to minimum CAC rating of
35 or omitted for suspended ceiling systems where
room-to-room sound attenuating requirements are less
critical or are achieved by other means.
NRC Rating - Use NRC of 0.50 minimum only in spaces
where sound control is not critical. For conference
rooms, executive offices, teleconferencing rooms,
and other occupancies where sound control is
SECTION 09510
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