WALL & ROOF CONSTRUCTION: The room´s walls
and roof are Acoustic Systems Type 2, four-inch (4")
thick panels. Panels are fabricated with 16 gauge
galvanized-bonderized, cold-rolled steel outer surface
and 22 gauge perforated, galvanized-bonderized, cold-rolled
steel inner surface. Perforations are 3/32" diameter
holes on 3/16" staggered centers providing a
23% open area. The panels are filled with three inches
(3") of acoustic insulating material and a one-inch
(1") gypsum board barrier. The acoustic fill
is inert and mildew and vermin resistant. Thermal
conductivity does not exceed K=0.240. All internal
framing members are formed 16 gauge, galvanized-bonderized,
cold-rolled steel and are spaced at a maximum of 24".
All welds are spaced at 4" to 6" intervals
and ground smooth on all exposed surfaces.
FLOOR: The acoustic floor is four inches (4")
thick. The floor is sealed with a 16 gauge, galvanized-bonderized,
cold-rolled steel bottom skin and is fully insulated.
The perimeters are constructed from a formed 11 gauge
steel channel. Steel internal reinforcement members
are spaced on 12" centers. The walking surface
is 11-gauge steel and is covered with 1/8" thick
industrial grade vinyl floor tile. The floor is mounted
on vibration isolation rails to reduce structurally
transmitted vibration that can negatively affect acoustic
performance. The rails are designed with molded elastomer
(50 durometer rubber) isolators with a natural frequency
of 15 Hertz
DOORS: The two inch (2") thick, 36" x 74"
clear opening STC-40+ door is fabricated with 16 gauge,
galvanized-bonderized, cold-rolled steel solid face
sheets. The door is pre-hung, left-hinged and swings
out with a ½" threshold. Acoustical seals
consist of a ¾" magnetic bellows and neoprene
compression gasket along the jamb and header and an
adjustable neoprene compression gasket along the threshold.
WINDOWS: The window is a 24" x 36", double
glazed, ¼" x ¼" laminated
safety glass mounted in tight sealing with neoprene
gaskets. Desiccant material is installed between the
windowpanes to prevent condensation. The double glazed
safety glass weighs at least 6.5 pounds per square
foot.
LIGHTING: Enclosure lighting consists of two (2),
incandescent, dual bulb fixtures with glass covers,
recessed in the ceiling.
HVAC: The system provides an acoustically treated
300 CFM or 600 CFM or 900 CFM ventilation system for
circulating room air into the enclosure.
