Fantech's N2T series rectangular attenuators with 200mm thick tapered splitters are available to suit a variety of applications and duct dimensions. They can be made in different widths and heights, and each model number denotes a different percentage of open area and length combination. They provide superior insertion loss and pressure drop performance over standard rectangular attenuators.

The N2T series with 200mm tapered splitters are ideal for general HVAC purposes and suitable for industrial applications.

The splitters have a bio-soluble acoustic grade glasswool, encased behind finely perforated galvanized steel. The infill is hygroscopic and incombustible.

Suitable for dry applications. Refer to the N2T/ N3T..QS series for applications where moisture may be present in the air stream.

• Casing and splitters made from Z275 coated galvanized steel.
• Infill from bio-soluble acoustic grade glasswool or mineral wool, encased behind finely perforated galvanized steel. Infill is hygroscopic and incombustible.
• Standard construction rated to duct pressures between -500Pa and +1kPa relative to atmosphere.

• 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.
• Matching flanges for attaching to accompanying ductwork can also be supplied.
• Rectangular attenuators will typically be made in a single piece up to a maximum of 2250mm in width, length, or height where practical for transportation. Above this dimension attenuators will be split into multiple sections in the dimension(s) exceeding the 2250mm limit noted.
• 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.

The following are available as special options when ordering

Fantech rectangular attenuators:

• Different materials of construction such as Stainless Steel Grades 304 and 316.
• Paints / protective coatings such as epoxy paint, Chlorinated Rubber etc.
• Flange material/dimensions profile can be specified (e.g. Ductmate, TDF, Plain Steel Angle).
• Access doors for easy cleaning (e.g. in Kitchen Exhaust Applications).

Static insertion loss values derived from tests to ISO 7235:2003 Acoustics

• Laboratory measurement procedures for ducted silencers and air-terminal units.
• Insertion loss, flow noise and total pressure loss.
• Insertion losses greater than 60dB are not reported.

Rectangular attenuators shall be of the N2T, N2T..QS, N3T or N3T..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 ISO7235:2003

The casing shall be manufactured from forming grade Z275 coated galvanised steel sheet with Pittsburgh corner seams and 200mm or 300mm thick tapered splitters. The infill material shall be bio-soluble acoustic grade glasswool or mineral wool. The infill material shall be encased in galvanised perforated sheet metal. Where attenuators are exposed to the weather, grease, liquid, or dusts they shall be of the N2T..QS or N3T..QS Series where all infill materials shall be protected with an impervious film to prevent the ingress of moisture.

The infill material when tested in accordance with AS1530.3:1999 shall have the following indices:-

 Ignitability 0    Spread of flame 0   Heat evolved 0   Smoke developed 1