Duct Silencers

ASL manufactures a wide range of duct silencers with casings in accordance with HVCA specification DW/144.

ASL ductwork silencers are fabricated from pre-galvanised mild steel sheet and are also available in stainless steel, aluminium, polypropylene and GRP.

ASL Supply duct silencers to a number of Acoustic Companies and many of our silencers have ended up in such prestigious places as NEC – Birminghan, Honda – Swindon, etc. We are able to aid our customers with non standard design, like the curved elbow silencer on the following page.

Rectangular Silencers

ASL design and manufacture splitter attenuators/silencers from small cross-talk silencers right through to large industrial Attenuators. We offer standard pre-galvanised construction, 304 and 316 stainless steel and powder coated options. Our Attenuators are used in various industries including HVAC, water & waste treatment, Chemical industries, Process engineering, Off-shore, commercial buildings, etc. ASL manufacture a range of ductwork/HVAC attenuators, which are manufactured in accordance with HVAC specification DW/144.

– Discharge Rectangular Silencer, ready for packing.

Elbow Silencers

Elbow duct silencers are of the same construction as the rectangular elbow silencers. The benefit of elbow duct silencers is that they can be used where there is limited duct length available. They are designed so that air is aerodynamically channelled round the bends, thus reducing pressure drop loss.

– Bespoke Elbow silencer manufactured in 3 sections due to site restrictions

mall Discharge Silencer c/w Transition duct

Rectangular Silencer & Transtition

In addition to ductwork/HVAC silencers ASL manufacture duct transition section. A transition is a ductwork component that connects ducts of different shapes or sizes, such as rectangular to circular, ensuring smooth airflow while minimizing turbulence and pressure loss, and is often customized to suit specific system layouts. Both components are integral to efficient and quiet HVAC and ventilation systems.

– Small Discharge Silencer c/w Transition duct

Circular Silencers

Circular duct silencers have walls lined with acoustic infill material which is retained by a pre-galvanised perforated inner skin. To increase the attenuation a centre pod is fitted. Circular duct Silencers will either come with spigot ends or have tapped end rings to suit customer’s requirements.

– Straight through Circular silencer

Small Circular Silencers

ASL manufactured Small circular duct silencers from as small as 100mm i/dia, generally the same construction as the standard ones, but with thinner walls, as with the standard ones these are also available in 304 and 316 stainless steel.

– Small Circular Silencers

Recent Projects

Bank of rectangular silencers ready for testing.

Bank of Silencers were tested by our customer prior to them installing them at Bishopsgate in London.

Large Industrial Circular Silencer c/w central pod

Large Industrial circular silencer for an exhaust stack, casing manufactured by a third party, lined out by ASL and central Pod manufactured and fitted by ASL.

Inlet and discharge silencers/attenuators for Hope Valley Cement works in the Peak District

ASL manufactured Inlet and discharge silencers for the shell cooling fans at iconic the Hope Valley cement works in the Peak District national Park 24 no. silencers in total. Inlet silencers had to have removable splitters.