High Velocity Attenuator

Our High Velocity Attenuator is designed to silence ducting at key intervals in air handling systems. It can be used in several applications for sound attenuation and radiated noise reduction. This is especially useful in office environments where sound can travel between rooms through the air ducting.

Radiated Noise Reduction

Terminal box throttling damper noise will not go through the attenuator wall into occupied space.
Eliminates box-to-box crosstalk noise.
To enable calculating the fan noise reduction through or past the terminal box to downstream components
To substitute for double-wall duct in space where difficult offsets might occur

Length

5' standard (tip-to-tip)

Velocity

3000 FPM

Operating Temp

0-350° F

Working Pressure

20" WC + and -

Burst Pressure

40" WC

Metal Core

.0055" thick, AL 30003 - H111

Insulation

1.5" thick, .5 lb. density

R-Value

4.5

Metal Sleeve

Inner Ply .0025" thick, AL 1100 - H19
Outer Ply .003" thick, AL 3003 - 0

Sound Attenuation

Final silencer in the HVAC system, after the duct work and before the terminal box
For sound attenuation after the terminal box where noise to the ceiling space is undesirable
With pressure blowers and other high velocity, small discharge area fans
As a duct silencer, where other than straight conditions exist
Eliminates the need for wrapping flexible duct with acoustical lagging materials

Detail of Construction

Peforated Metal Core –
the Clevaflex HVA core is constructed from one ply of perforated and corrugated aluminum with interlocked seams, folded flat and knurled for flexibility and strength.

Fiberglass Insulation Wrap – the core is then completely wrapped with a blanket of fiberglass insulation.

2-Ply Metal Sleeve –
the exterior sleeve is constructed with two plys of aluminum permanently fused together and corrugated, creating a continuous inner and outer surface that is airtight, flexible, and strong. Inlet and outlet collars are then attached to the ends.