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Sound diffusive
ceilings and walls are one of the most effective ways to simultaneously
control room reflections and provide a natural ambiance. Since ceiling
systems and wall applications often cover appreciable surface areas, a
cost-effective 2D sound diffuser is required. To meet these needs and life safety
fire codes, RPG® developed the first non-combustible Fiber Reinforced
Gypsum (FRG) modular 2D sound diffuser that lays in a standard reinforced T-bar
grid system.
The FRG Omniffusor® uniformly scatters sound arriving from any direction
into many directions, providing ideal distribution and coverage. It’s
unique shape also adds the visual interest of a bas relief sculpture.
Problem
To provide 2D sound diffusion for large surface areas and meet life safety fire
codes, a molded modular diffuser that mounts in conventional T-bar systems
is needed.
Solution
The FRG Omniffusor® is the first cost-effective, non-combustible,
molded Fiber Reinforced Gypsum 2D QRD® sound diffuser. It offers twice the reflection
attenuation of the 1D QRD® because it scatters sound uniformly into
a hemisphere. The FRG Omniffusor® provides uniform, omnidirectional,
broad bandwidth sound diffusion in an attractive ceiling or wall design element.
 Absorption
Recently, it was discovered that phase gratings, consisting of wells of
different depths separated by dividers, also may provide sound absorption.
The absorption is caused by viscous losses created by high particle velocity
flows over the dividers, between wells of different depths and resonant
frequencies. The absorption can be enhanced by placing a resistive element,
e.g. fabric, near the face of the phase grating. The graph illustrates
the absorption performance uncovered, with fabric directly on the surface
and at 2" and 7" above the surface.
Diffusion
The random incidence acoustical data illustrates how the FRG Omniffusor® provides useful sound diffusion
in the mid and high frequency range. The chart displays the mean diffusion coefficient,
which is the normalized standard deviation of the 1/3 octave polar responses
for angles of incidence between 0° and 90°, the normalized scattering coefficient
for computer modeling calculations and the A-mount absorption coefficient for reference.
Installation
When ceiling suspended in a 15/16" T-bar grid, the FRG
Omniffusor® and FRG Liteffusor® protrude 3 1/4" into the room. Wall mounting the
FRG Omniffusor® requires custom wooden stiles and rails with
a 1/8" dado to capture the perimeter flange.
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Home:
Products:
FRG Omniffusor™
The
First Molded FRG Two Dimensional QRD® Sound Diffuser From
The Acoustical Industry’s Leading Innovator
| Features
& Benefits |
Features
2D QRD® reflection phase grating
Uniform hemispherical scattering for all angles of incidence
Simultaneously offers diffusion and moderate mid band absorption
2D QRD® provides twice the diffusive specular attenuation
of a 1D QRD®
Non-combustable FRG
Cost effective molded FRG panel
Available in modular 2' x 2' panels
Liteffusor™ can incorporate down lighting:
Benefits
The 2D QRD® provides phase variation in two orthogonal
directions for uniform omnidirectional scattering
Hemispherical scattering is ideal for ceiling applications because
the incident sound is uniformly distributed throughout the room
from a planar ceiling surface
The omnidirectional diffusive attenuation, coupled with moderate
mid band absorption, provides ideal reflection control without
deadening the space
2D diffusive attenuation provides effective diffusive control
of strong specular reflections
FRG is non-combustible and can be used in any space to meet
life safety fire codes
Low cost allows designers to cover large surface areas for optimum
performance
Modular 2' x 2' panels can be wall mounted or suspended in a
15/16'' T-bar ceiling grid
The central flat area (9 3/8" x 9 3/8") of the FRG Liteffusor™
allows designers to incorporate down lighting, sprinklers, projector
supports, and other design elements |
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Copyright
2000, RPG Diffusor Systems, Inc.