We recently received a question about how to soundproof a rooftop ventilation system. There is no stock solution, unfortunately. It’s impractical for any company to stock soundproofing enclosures for every piece of noisy equipment. The differences in ventilation requirements, size, and ease of access make this impossible. These soundproof enclosures can, however, be made custom for many of these noisy machines.
The ABBC-13EXT AudioSeal® Exterior Sound Blanket used for rooftop equipment enclosures at a school.
Q: We’re behind a mini-mart with a cooler of some sort on the roof. Its intermittent noise is annoying and makes the back yard unpleasant. It’s mounted on 30-inch legs. I’m thinking of a plywood three-sided enclosure with sound blankets. They need to be weatherproof. Thoughts? This shot is a close up. It’s about 20 away.
That’s a tough situation – it’s aggravating enough being exposed to noisy equipment at the workplace or in public facilities, but to have it invade your living space from another property can seriously deteriorate your neighborhood satisfaction and quality of life.
Fortunately, we have dealt with this type of ventilation system soundproofing issue before. By calling in and speaking with one of our knowledgeable sales representatives, you can learn how to cut the noise using a variety of materials.
AlphaSorb® Exterior Grade Absorber/Barrier Acoustical Blankets are a popular soundproofing solution for this type of application because as their name suggests, they not only absorb but block noise transmission and can be used outside, exposed to the elements. Acoustical Blankets are especially conducive to making enclosures for oddly shaped equipment. This is because they can line the inside of stiff forms and produce curved openings for ventilation. Cut outs can also be made in the blankets if access points are required for operation.
Hoover & Strong utilized a recirculating clean air unit which uses a variable speed blower designed to clean the air that is then ducted within their HVAC rooftop ventilation system.
Typically, installation of these units are on roof tops or above ceilings. This is because of the noise levels emitting from the blower (as is the case with the aforementioned customer’s issue). In Hoover & Strong’s case the unit had to be installed within a mechanical room right next to a smelting work area.
An enclosure similar to this would effectively soundproof a rooftop ventilation system, with obvious adjustments made due to its difference in placement, and with exterior grade blankets to suit the outdoor environment.