William H. O. Kroll

               & Associates, Inc.


“Creative, Innovative Solutions to

                                      Acoustical Challenges”




Industrial Noise and Vibration

Aircraft Noise Reduction   

Machine Vibration
Noise & Vibration Monitoring

Compressors and Chillers

Electrical Noise      
Fan and Blower Noise

Structural Vibration

Ground Vibration

Air System Noise    


Kroll and Associates can provide expert engineering, noise level and vibration analysis for:

·        Specification of acceptable noise & vibration standards

·        Mechanical room noise and vibration containment

·        Planning for quiet ventilating air HVAC, duct & VAV box systems

·        Analysis, reduction and containment of existing noise and vibration

·        Determination and solutions for real estate and zoning regulations

·        Guidelines for electrical system design

·        Building code compliance

·        Review mechanical and electrical design for noise and vibration isolation compliance

·        FHA/VA regulation compliance

·        All manner of tests: from simple to extremes of complex needs and sensitivity ranges


Sample Projects

·        The Mall of America - rooftop air handling units and transformers to address noise levels and sound and vibration, and the building shell with respect to aircraft noise

·        The University of MN - Two one-thousand ton chillers and a 2,000 KVA substation on the fourth floor of the Wilson Library

·        The AC Corporation - twelve diesel electric systems in South Carolina

·        Chinook Industries - a 1.25 million Btu burner for a Kiln - projected 80 dBA noise level at one mile- noise and vibration containment.

·        The Metropolitan Wastewater Treatment Plant - noise and vibration reduction for the plant expansion

·        The Nash Finch Co. - Air Handling units, chillers and condensers next to residential

·        West Publishing – Designed sound attenuation to meet residential noise levels for a 14 MW power plant (7 – 3516 CAT engines rated at more than 2700 HP each)



William H. O. Kroll & Associates, Inc.

5217 West Mill Road, Minnetonka, Minnesota 55345

Phone: 952-934-9494



“Creative, Innovative Solutions to Acoustical Challenges”