critical, use NRC 0.60 minimum. For open office
environments, use NRC of 0.75 minimum.
Light Reflectance - A lower light reflectance may be
specified when desired for special architectural or
lighting effects. The available LR (light
reflection factor) are LR-1 (0.75 minimum), LR-2
(0.70 minimum), LR-3 (0.65 minimum), LR-4 (0.60
minimum).
Edge Detail - Rabbeted edges may be specified to
permit face of panels to project below surface of
exposed grid system. Strong sidelighting at low
angle of incidence in concealed suspension systems
will greatly exaggerate surface irregularities;
beveled edge tiles are suggested for such locations.
Review manufacturer's literature and edit the
following paragraphs.
**************************************************************************
Contractor shall comply with EPA requirements in accordance with Section
01670 RECYCLED / RECOVERED MATERIALS. Acoustical units shall conform to
ASTM E 1264, Class A, and the following requirements:
2.1.1
Units for Exposed-Grid System [A] [_____]
**************************************************************************
NOTE: In facilities where several different NRC
values are specified, clearly indicate which room or
areas should receive lay-in panels of a specific NRC
value.
**************************************************************************
Type: [III (non-asbestos mineral fiber with painted finish)] [IV
(non-asbestos mineral fiber with membrane-faced overlay)] [IX (mineral
fiber with scrubbable finish)] [XI (mineral fiber with fabric faced
overlay)] [XII (fiberglass base with membrane-faced overlay)].
Minimum NRC: [0.75] [_____] in open office areas; [0.60] [_____] in
conference rooms, executive offices, teleconferencing rooms, and other
rooms as designated; [0.50] [_____] in all other rooms and areas when
tested on mounting Type E-400 of ASTM E 795.
Pattern:
[A] [B] [C] [D] [E] [F] [G] [I] [J] [K] [_____].
Nominal size:
[600 by 1200] [_____] mm. [24 by 48] [_____] inches.
Edge detail:
[Square] [Reveal] [Trimmed and butt] [_____].
Finish:
Factory-applied [standard finish] [color finish].
Minimum LR coefficient:
[LR-1, 0.75 or greater] [_____].
Minimum CAC:
[40] [_____].
Flame Spread:
Class A, 25 or less
SECTION 09510
Page 13
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