Cotton-fiber based media formed from post-industrial reclaimed cotton fibers and treated throughout with a borate solution, providing the necessary flame and smoke-spread ratings and inhibiting the growth of mold.

Moldblock MediaTM Silencer Sheet
Moldblock MediaTM Product Sheet
Acoustic Plenum
Tongue and Groove Panel
Duct Silencer Installation Guidelines
Operation and Maintenance Guidelines
Silencer Warranty


Moldblock Rectangular

Designated as “RMB” for Rectangular MoldBlock MediaTM silencers, this product line is designed to match straight rectangular ductwork connections and casing geometry.

RMB Data – Ultra Low Velocity
RMB Data – Low Velocity
RMB Data – Medium Velocity
RMB Data – High Velocity
RFMB Data – Ultra Low Velocity
RFMB Data – Low Velocity
RFMB Data – Medium Velocity
RFMB Data – High Velocity


Moldblock Circular

Circular MoldBlock MediaTM silencers are labeled “CMB” and are typically used with circular duct systems or inline axial fans.

CMB Data – Low Velocity
CMB Data – Medium Velocity
CMB Data – High Velocity
CMB Data – Ultra-High Velocity
CFMB Data – Low Velocity
CFMB Data – Medium Velocity
CFMB Data – High Velocity
CFMB Data – Ultra-High Velocity


Moldblock Elbow

When project space limitations cannot accommodate straight silencers, Rectangular Elbow MoldBlock Media (“REMB”) silencers can be used to both reduce noise and control pressure losses.


Moldblock Transitional

To save space and reduce project cost, any silencer can be designed to have different connections and casing geometry to match project requirements.


Moldblock Any Shape & Size

Vibro-Acoustics can provide duct silencers to match project requirements for space and configuration limitations – virtually any size or shape is possible.


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