The John J. Barry Company

C. William Ruth, President

Mechanical (HVAC) Engineer

Registered Professional Engineer #31219                      




1974 - Commissioned Naval Officer / Officer Candidate School    

1974 - B.S. Mechanical Engineering / Lehigh University




2004 - Licensed Professional Engineer in the State of Maryland (P.E. #31219)


Qualifications Summary


Mr. Ruth has over forty-three years of experience evaluating, designing, selling, and/or installing custom environmental control systems to private industry and government agencies.  Applications of these systems have ranged from U.S. Naval Vessels and Battery Manufacturing Firms to office buildings, landfills, and industrial manufacturing plants. 


As a licensed Professional Engineer, Mr. Ruth has in-depth knowledge of local and federal codes, standards, and regulations involving environmental, indoor air quality, life, and safety issues, with full charge responsibility at all levels, including contract negotiation, planning, engineering, and development of project specifications.


Mr. Ruth possesses extensive knowledge working with all types of mechanical equipment and electrical control systems. His work mostly involves HVAC psychometrics, air velocities and pressures, heat load and moisture transmission, fluid mechanics, and logic control. He is familiar with the design of all types of HVAC mechanical equipment including: fans, pumps, heat exchangers, ductwork, fan coil units, air handling units, dehumidifiers, chillers, cooling towers, boilers, steam, hot water, energy recovery, pollution elimination, electrical power systems, and electrical power and control systems.


Relevant Experience Highlights


  • Since 1981, Mr. Ruth has been performing as Maryland's Sole Manufacturer's Sales Representative for Aerovent Industrial Air Moving Equipment and Essick Air Product’s Evaporative Coolers for The John J. Barry Co., continuing to provide technical specifications, sales, and installation of air moving equipment to military, commercial contractors, and industrial facilities. 
  • Chief designer and contract manager for the fabrication of original equipment, “EINBAR Climate Controllers”, which are custom-built industrial dehumidifiers and air handling equipment sold worldwide.
  • Mr. Ruth is routinely involved in the engineering evaluation of mechanical systems, as related to indoor air quality complaints and air pollution issues.  Listed below are just a few of the many projects Mr. Ruth has successfully evaluated over the past several years:


  • Sherwin Williams Paint, Baltimore, MD: numerous industrial ventilation design and installation projects, including a ventilation system for paint mixing tanks. 
  • Howard & Gelkin Rosenbloom, Lutherville, MD: Attic Mold Survey and Analysis.
  • GRR Aerosol, Attalla, Al: KRUNCHER Bldg Ventilation Evaluation with Recommendations.
  • Parkville Police Station, Parkville, MD: Design of Under Slab Ventilation System.
  • Cenveo, Cambridge, MD: (7) Printing Presses – Exhaust AirFlow Measurements and Analysis.
  • Gamse Litho, Baltimore, MD: Flexo Press Exhaust Air Volume Measurement and Determination.
  • Community College of Baltimore County, MD: Measurement & Certification of (28) Lab Hoods.
  • Flowserve Pump Div., Taneytown, MD: Design of Mercury Removal Vessel for Despatch Oven.
  • Rockland Industries,, Inc., Baltimore, MD: Design of Dust Capture Hood of GL-675 Mixing Tank.
  • Piedmont Laboratories, Gainesville, Ga: Design & Install Ventilation System for Aerosol Filling.
  • Victor Graphics, Baltimore, MD: Design & Install Visible Emissions Control System for (4) Presses.
  • McCorquodale, Inc., Whiteford, MD: Evaluation & Design of Hot Air Duct System for (3) Presses.
  • Up-To-Date Laundry, Baltimore, MD: Design & Installed Ventilation & Evaporative Cooling Systems.
  • Mine Safety Appliances CO., Sparks, MD: Evaluation of (4) Cabinet Ventilation Fans.
  • Colwell, Whiteford, MD: Design to Split Press 7 & 8 with separate Ventilation Hot Air Systems.
  • VA Hospital, Baltimore, MD: Evaluation of IAQ Issues in Imaging/HVAC System AC7.
  • H.G. Roebuck & Son, Inc. Baltimore, MD: Design & Install Visible Emissions Control Equipment.       


Professional Experience 


Jenkins Environmental, Inc. (Towson, Maryland)                                                       1997-Present

Senior Mechanical Engineer


The John J. Barry Company (Phoenix, Maryland)                                                      1981-Present

President (1984-Present)

Sales Engineer (1981-1984)


Lippert & Welsh Company, Inc. (Charlestown, West Virginia)                                        1978-1980

Acting President 


USS Davidson, FF-1045 (Pearl Harbor, Hawaii)                                                             1978-1980

Naval Engineering Duty Officer



Professional Memberships


Maryland Society of Professional Engineers                                                           2005 – Present

National Society of Professional Engineers                                                             2005 – Present



Bill Ruth

Phone: +1 410/6671776




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