8/4/2019 DuraSystems - DuraDuct Acoustical Brochure

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DURADUCT.

DURASYSTEMSDURADUCT

The all-in-one cULus-listed fire resistant acoustical duct system. 

DuraDuct is the all-in-one acoustical duct system. One

system to address fan breakout noise, mechanical

protection of the duct system and fire resistance.

The outer skin consists of a fire, impact and moisture

resistant shell. No additional wraps or enclosures are

required. With an overall footprint no larger than a

standard duct, it is slim, lightweight and maintenance-

free. DuraDuct is also cULus-listed as a 2-hour fire-rated

duct assembly and also happens to be the largest listed

fire-resistant duct assembly in the industry, giving you

both flexibility in design and confidence in its

performance.

Although the overall installed dimensions of the DuraDuct system are no larger than a standard Sheet Metal and AirConditioning Contractors’ National Association (SMACNA) duct, its mass density is an impressive 4.3 lb/ft

2(21 kg/m

2)

greater than that of two layers of drywall. Its Transmission Loss (TL) properties would be greater than that of ¼” plate

ductwork. DuraDuct, with a Sound Transmission Class (STC) of 35, would be equivalent to enclosing a standard 22 gauge

duct assembly with acoustic lagging or 1” thick drywall throughout the entire length of ductwork.

Transmission Loss through a single 3/8” (9.5mm) DuraSteel panel.

Octave Band, Hz 63 125 250 500 1000 2000 4000 8000

Transmission Loss, TL 27 31 35 41 38 35 32 37

Sound Transmission Loss and Noise Reduction Coefficient of DuraSteel.

Sound Transmission Class, STC 35

Noise Reduction Coefficient, NRC 0.10

DuraSystems | 199 Courtland Avenue, Vaughan, Ontario, Canada L4K 4T2 | 1.866.338.0988 | www.durasystems.com

THE ACOUSTICS BEHIND DURADUCT.

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THE FACTS BEHIND FAN BREAK-OUT NOISE.

Fan breakout noise is sound energy from the fan

that is transmitted through the duct walls as it

travels downstream or upstream in a duct system.

While designers are consciously aware of airborne

noise at the diffusers, fan breakout noise is still a

commonly overlooked aspect in mechanical design.

Good design practices such as maintaining proper

duct velocity, using smooth duct transitions and

selecting appropriate diffusers are critical however

addressing fan breakout noise through the duct

walls is equally important. As reducing supply air

noise is only one part of the puzzle, the re-

introduction of breakout noise may bring the room

noise levels back up above the specified Noise

Criteria (NC) level that the designer originally

anticipated.

DuraSystems | 199 Courtland Avenue, Vaughan, Ontario, Canada L4K 4T2 | 1.866.338.0988 | www.durasystems.com

THE ALL-IN-ONE SOLUTION.

DuraSteel offers a Sound Transmission Class (STC) of 35.

DuraSteel panels are available in 48”x96” sheets and can be

easily cut, drilled and shaped to suit your design requirements.

They are generally screw fixed to a mild steel structural

framework constructed on site.

Painting and corrosion resistant coating options are available.

DuraSteel is a simple, easy, maintenance-free acoustical

solution that is also fire, impact, blast and moisture resistant.

The most common area where breakout noise will be an issue is directly downstream of the supply fan or directly

upstream of the return fan in a rooftop air conditioning unit. Sound attenuating devices must be applied immediately to

reduce the sound power levels of the unit. Any section of non-treated duct will be potential for breakout noise. 

DURASYSTEMSDURADUCT