HVAC Attenuation (QLD)

Australian-Made Custom HVAC Noise Control (Attenuators, Cross-Talk Baffles, Acoustic Louvres & Enclosures)
HVAC Attenuation is a specialist Australian manufacturer of rectangular/square and circular duct attenuators (silencers), cross-talk attenuators, and acoustic louvres/enclosures—built to order for HVAC, industrial and process applications. Their proposition is simple and highly engineer-relevant: control plant and ductborne noise with fit-for-purpose hardware, backed by rigorous testing to BS4718:1971, and practical construction options that suit real projects and real sites.
If you’re designing to meet internal comfort criteria (offices, education, health) or external environmental noise limits (plantrooms, rooftops, service yards), HVAC Attenuation sits in the sweet spot between “generic silencer catalogues” and “fully bespoke acoustics consulting”—with locally manufactured product ranges and configuration flexibility that helps you land sound outcomes without derailing pressure drop, space claim, access, or buildability.

What they do best (designer value proposition)
1) Duct attenuators designed to stay straight, seal, and perform
HVAC Attenuation’s square/rectangular and circular attenuators are manufactured in Australia and described as fit-for-purpose, with designs intended to avoid casing/flange deflection—a practical detail that matters when you’re trying to keep ductwork aligned, airtight, and installable.

2) Cross-talk attenuation for transfer paths between spaces
For low-velocity air transfer and acoustic separation between rooms (shafts, ceiling plenums, walls/doors), HVAC Attenuation supply cross-talk attenuators intended to maintain sound transmission ratings while still allowing continuous air movement. They list multiple variants (XTL/XTS/XTU/XTZ) to suit common installation geometries.

3) Acoustic louvres and enclosures for “plant noise to outside”
They deliver high-performance acoustic louvres aimed at noise reduction with low airflow restriction, and standard or tailored acoustic enclosures for indoor/outdoor plant—useful when your controls are outside the duct (e.g., intake/exhaust openings, rooftop screens, packaged plant, or service yard equipment).

Products and configurations
Square & Rectangular Attenuators (duct silencers)
Construction & materials (as stated):

Galvanised steel (Z275), stainless (304/316), mild steel (thicker material where required)

Melinex® + glass fibre membrane

Built to fit standard ductwork connections

Fire hazard indices noted (infill): glass wool or mineral wool tested to AS1530.3:1989 with indices listed as 0 for ignitability, spread of flame, heat evolved, smoke developed.
Options commonly needed on projects:

Construction material choice (e.g., aluminium)

Access doors, weather cowls, customised flanges, vermin mesh screens

Finishes: powder coat, epoxy, hot-dip galvanised, anodised (and other finishes by request)

Circular Attenuators (round duct silencers)
Mirrors the rectangular range with the same stated material options and AS1530.3:1989 indices approach, plus the same configurable options list (access, weathering, flanges, screens, finishes).

Cross-Talk Attenuators (transfer path acoustic baffles)
Positioned for low-velocity air transfer between adjoining spaces, across a range of mounting conditions:

Common shaft / multiple installations (XTL)

False ceilings (XTS / XTU)

Through walls or doors (XTZ)

Acoustic Louvres & Enclosures
Acoustic Louvres (AL Series) – design features include:

Mild steel / stainless / aluminium options

Finish options including powder coat, two-pack polyurethane, anodised

Supplied in module form for on-site assembly

Optional vermin mesh screens

“Tested performance” noted

Acoustic Enclosures – design features include:

Material & finish options (as above)

Access doorways and lifting points options

Vermin mesh screens option

Indoor and outdoor enclosure capability

Project experience (examples shown on their site)
Listed project examples include:

Tweed Valley Hospital

Heinemann Gold Coast Airport

Guzman y Gomez

CQ University – Rockhampton

RAAF Cinema Base Darwin

St James College

Santa Sabina Strathfield

Queens Street Southport

Ozcare Newstead

IGA

IGLU Mascot

Woolworths Projects

Why engineers and D&C contractors shortlist HVAC Attenuation

Australian manufactured, custom built-to-order attenuators and noise control hardware (good for lead time control, fit-for-purpose builds, and project-specific constraints).

Testing to BS4718:1971 is explicitly stated across their range (helpful when you’re trying to defend acoustic selections and document intent).

Specification-friendly options: access, weathering, screens, custom flanges, coatings—i.e., the details that stop “acoustic hardware” becoming an installation headache.