Tips
There are two sources of noise related to your ductwork. The fan noise generated within the furnace itself, and the noise resulting from constricted airflow hustling through your ductwork. To quiet your furnace room itself, visit the Furnace section of this website. Here we deal with the ductwork only.
If your furnace emits a higher velocity of airflow than the diameter of your ductwork wants to allow, you will create noise that will vibrate along the metal surfaces of your ductwork as a result of the constriction of the air movement.. As the metal vibrates, the noise begins to break out through the walls of the duct out into your room. To treat this, simply wrap NetLag around the duct and seal the wall off. If your wall is already finished, line the common wall with dB-Bloc, frame out over this surface, and apply a new layer of drywall as outlined in our Walls section of this Applications Guide. In either case, you will be able to eliminate a good portion of the noise that you will otherwise be exposed to.
For noise bleeding out the mouth of your supply or return vents, consider replacing a section of your ductwork with insulated ductwork lined with fiberglass and designed to control spillage. Or consider an Induct Silencer designed to allow for the free movement of airflow but will serve to attenuate the noise that wants to bleed out with it.
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