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H
H-5
NOISE CONTROL PRODUCTS
© FANTECH
2016
RECTANGULAR DUCT ATTENUATORS
CONSTRUCTION
O
Casing and splitters made from Z275 coated galvanized
steel.
O
Infill from bio-soluble acoustic grade glasswool or mineral
wool, encased behind finely perforated galvanized steel.
Infill is hygroscopic and incombustible.
O
RT and R3T Series have a fiberglass membrane between
infill and perforated steel layer to minimize fibre egress from
the infill into the air stream.
O
Q-Seal (QS) variants have infill material fully wrapped
in liquid impermeable Melinex
®
PET Plastic Film.
O
Standard construction rated to duct pressures
between -500Pa and +1kPa relative to atmosphere.
SECTIONAL SIZING AND JOINING
FLANGE INFORMATION
O
Flanges 35mm TDF or compatible up to a maximum
height or width of 1200mm. Above these sizes 40mm
or 50mm steel angle section frames used, supplied
undrilled.
O
Matching flanges for attaching to accompanying
ductwork can also be supplied.
O
Rectangular attenuators will typically be made in a single
piece up to a maximum of 2250mm in width, length
or height. Above this dimension attenuators will be split
into multiple sections in the dimension(s) exceeding the
2250mm limit noted.
O
As a special request, attenuators may be divided into
smaller sized sections than standard to fit through small
spaces, before they are reassembled as a single unit
on site.
CUSTOMISED ATTENUATOR
OPTIONS
The following are available as special options when ordering
Fantech rectangular attenuators:
O
Different materials of construction such as Stainless Steel
Grades 304 and 316.
O
Paints / protective coatings such as epoxy paint,
Chlorinated Rubber etc.
O
Flange material/dimensions profile can be specified
e.g. Ductmate, TDF, Plain Steel Angle.
O
Access doors for easy cleaning (e.g. in Kitchen Exhaust
Applications).
SUGGESTED SPECIFICATION
Rectangular attenuators shall be of the RT, R3T or RT..QS Series
as designed and manufactured by Fantech Pty. Ltd. and shall
have the dimensions, acoustic attenuator insertion losses and
pressure losses as scheduled. Acoustic Attenuator Insertion
Loss data for the attenuators to be derived from tests in
accordance to BS4718:1971.
The casing shall be manufactured from forming grade
zinc-coated mild steel sheet with Pittsburgh corner seams.
The infill material shall be either rockwool or fibreglass as
specified by the manufacturer. The infill material shall be covered
with a membrane to prevent erosion of the fibres, then encased
in galvanised perforated sheet metal. Where attenuators are
exposed to the weather they shall be of the RT..QS Series where
all infill materials shall be lined with an impervious film to prevent
the ingress of moisture.
The infill material when tested in accordance with AS1530.3:1989
shall have the following indices:-
Ignitability
0
Spread of flame 0
Heat evolved
0
Smoke developed 0