Design Solutions - Spring 2020 - 51

with a deep airspace filled
with supplemental absorptive
material. In this configuration,
very low frequencies are
absorbed making an effective
bass trap.

absorption behind the panel.
NRC range 0.70 - 0.90.
Grilles -- wood slats,
horizontal or vertical, with
space between them.
Absorption occurs by placing
supplemental absorptive

material either above or
behind the slats. Since
they have a high open
area that exposes the
absorptive materials to the
soundwaves, absorption is
relatively broadband. The
acoustic performance varies

based on the dimensions
of the slats, the spacing
between the slats and the
supplemental absorption
used. NRC range 0.70 - 0.95.
Another interesting use of
this material is to use small
gaps between horizontal slats

Wood Wool -- a material
that's been available for
many years. Manufactured
in panels and constructed
from cement bound Spruce
wood wool. The absorption
characteristics are fairly low
NRC (0.4), however when
placed over supplemental
absorptive material it
becomes a very effective,
durable broadband absorber.
NRC range 0.40 without
supplemental absorption
through 0.9 installed with 1"
fiberglass board (See below).

spring 2020

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51



Design Solutions - Spring 2020

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Contents
Design Solutions - Spring 2020 - Cover1
Design Solutions - Spring 2020 - Cover2
Design Solutions - Spring 2020 - 1
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