No other fixture spreads itself more completely across your building – which means isolating vibration is a critical element in running a quiet, efficient HVAC system.
Whatever the application, vibration is always going to be – at the very least – an irritant. But in an HVAC system, each vibration has the potential to travel and amplify along potentially miles of ducting. Not only does that make any vibration more of a problem – it also makes it harder to track the source.
So if you’re installing an HVAC system, you’ll have a number of vibration isolation elements to consider, including:
Isolating equipment: Although vibration can come from virtually any source within the system – from a loose grille to an ill-fitting section of ducting – it’s the equipment at the end of those pipes and ducts that is the most likely source.
The combination of motors and fans can create forces in multiple axes so it’s important to choose mounts and bushes that can cope with the respective forces that the system employs. Our cab/cone mounts enable isolation of all reciprocating and rotating equipment (i.e. the central plant and air handling units) from bases, supporting frames etc.
To explore which is the right isolation mount for your specific application, please contact us.
Maintenance: Ensure ducts are regularly checked for obstructions which can reduce the efficiency of the system and increase noise and vibration. Ensure regular checks of rubber mounts to identify early signs of wear or degradation.
Duct design: Duct design is critical in reducing noise and vibration. The easier it is for air to flow freely by, for example, limiting angles, bottlenecks and branches, or even avoiding the use of flexible ducting, the lower the turbulence and the lower the risk of noise and vibration generated by duct fittings and dampers.
It also means that the unit isn’t having to work too hard in supplying the required airflow requirements for the premises.
Installation: The way that ducting is installed also contributes to the passing of transient vibration and noise. If the ducting is simply resting on a joist, then vibration generated by the airflow can pass into the joist and through to the ceiling, causing nuisance noise.
If at all possible, the ducting should be suspended so that it cannot pass any vibration onto adjacent parts of the building fabric or structure.
Adding a silencer between the ducting and the unit should also reduce transient noise and vibration significantly.
Fan efficiency: Use a fan appropriate to the system. An undersized or oversized fan that operates outside its peak efficiency is likely to increase the risk of vibration and noise.