Silent installations in buildings

Sound from installations such as ventilation equipment and heat pumps is a common complaint. It is among the most common complaints in homes, workplaces, schools, preschools etc. One may often need to take measures at a later time to adjust any systems that have become too noisy.

Limitations in CAD-dimensioning

In the course of dimensioning ventilation systems, CAD provides rather good tool for calculating sound from unit to rooms, at least in dB(A). CAD- calculations do not generally suffice. There are many aspects of the sound propagation that are not mentioned in the calculation. See our article covering some of the shortcomings in issue 3/06 of the Swedish construction and technology periodical ”Bygg och Teknik", (link below).

Vibrations introduced into buildings

Vibrations that produce audible sound have become a very common problem. Although most fans are now well insulated from vibration, heat pumps have become common. They have vibrations of lower frequencies and greater forces. They also emit loud low- frequency sound, and noise from the machine room can thus result in a problem for any adjacent residential areas.

Weak beams in existing buildings are an additional problem to take into account. How should the machines be set up? Where are the dynamically best properties of the supporting structure? Even 250 millimetre concrete beams can be too weak for certain machines.

ACADs mode of operation

ACAD-International AB has been designing silent installations for more than 30 years. We have developed a method that permits us to almost completely dimension the entire ventilation system.

We have developed a way to measure or calculate dynamic properties of beams and can thereby design the measures needed for a vibration-free and discreet installation. In cooperation with several leading manufacturers of installation parts, units and fans, we have developed products with less vibration, quieter operation and better noise suppression.

In other words; we are experts on these installations and know how they interact with the building with respect to sound and vibrations. Let us design your system and you will be safe from the risk of subsequent modifications when noise level requirements are not met.

Related articles from ACAD in English

Practical Modeling of Vibration Isolation on Weak and Finte Supports:
www.acad.se/en/home/articles/practical_modeling_of_vibration_isolation_on_weak_and_finte_supports/