ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 31
an acoustic media that is resistant
to, and will not sag under, freeze/
thaw cycles.
Fixed-blade acoustic
louvers. Fixed-blade acoustic
louvers generally are used where
low-airfl ow face velocities (feet per
minute [meters per second])-that
is, reasonable volumetric airfl ows
and large ventilat ion openings
resulting in large cross-sectional
areas-are encountered. Simply,
they can be thought of as silencers
with smal l percent-open areas
offering maximum noise reduction
in a short length. They are available
in 6-in. (15 cm) to 24-in. (61 cm)
thicknesses and various percentopen-area
designs. Such systems
include louvered skirts along aircooled-chiller
barrier walls or equipment-yard
barriers and intake and
discharge ventilation openings for
pump rooms, generator rooms, and
central utility plants (Photo E). The
materials of construction depend on
the process. Wastewater-treatment
facilities tend to require stainless
steel, whereas commercial buildings
require galvanized or aluminum
sheet, sometimes, such as the case
of architectural applications, with a
powder-coated/wet-painted fi nish.
Double-walled barriers
and enclosure panels.
Barrier-wall and enclosure systems
must exhibit three characteristics:
■
■
A " critical " minimum density.
The ability to block transmitted
sound.
The ability to absorb reflected
sound.
Commonly, a rchitec t s and
owners use poured-concrete or
■
www.amca.org
2023 AMCA inmot ion
31
concrete-block walls for barriers
and enclosures. A dense material,
concrete is a better sound-transmission
blocker than reflected-sound
absorber, so barriers made from
concrete refl ect or redirect, rather
than absorb, noise, while concrete
enclosures create a large reverberant
chamber, magnifying noise instead
of absorbing sound.
Light-gauge corrugated-metal
sheeting also is used to construct
http://www.berner.com
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - November 2023
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2023
Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 15
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 16
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 17
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 18
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 19
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 20
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 21
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 22
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 23
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 24
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 25
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 26
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 27
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 28
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 29
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 30
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 31
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 32
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 33
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 34
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 35
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 36
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover4
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