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Select A Department:
Principals | Mechanical | Electrical | Technology | Administration
» Mechanical
Larry J. Marchetti, P.E.
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Director of Mechanical Engineering
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Larry has been practicing engineering since 1986 and is a registered engineer. He is responsible for the design, project management of mechanical engineering projects. Larry has specific expertise in engineering and design of HVAC, process piping, plumbing, fire protection, environmental control systems, and large steam plants and distribution systems for commercial, industrial, healthcare, and institutional clients.
Larry is responsible for the day-to-day management and supervision of the mechanical engineering discipline of the firm, which includes marketing, client contact, feasibility studies, design development, construction documents (drawings, specifications) preparation, and construction contract administration.
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Anthony Shebelock, P.E.

Director of Engineering Operations |
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Tony has been practicing Mechanical Engineering for over 14 years. He has extensive experience in the Educational and Healthcare fields. He performs design in both the Plumbing and HVAC systems areas. He is responsible for the day to day scheduling of the firm and manages all operational procedures. He also completes project proposals, contracts and serves as a project manager.
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Ed Oltra

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Ed is a graduate of Penn State University, 1980 and has a degree in Associate of Applied Sciences, Electrical Engineering Technology. He has been in the Mechanical Engineering field for 20 yrs. He has extensive experience in the evaluating and upgrading all types of commercial and industrial HVAC equipment. He performs design in both the Electrical and HVAC systems areas and has been a project manager for Mechanical firms in Pennsylvania, NY, and NJ.
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David Short

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NEWS
Arris Engineering has recently been awarded another design project at the Tobyhanna Army Depot.
The renovations and additions to the Building 72 Mezzanine area marks the fifth project awarded this year. Arris will act as the lead design professional for this
project and will work with M.E.R.I.T. Inc. in a design/build capacity to complete construction of the renovation and addition.
Arris has implemented Autodesk Revit MEP. The new software has allowed Arris to work with Architects that also utilize the Architectural version of the software and better serve to meet the client’s needs when considering a complete building system package. The software conversion included all the aspects of Autocad MEP and also allows for designs to be completed with the use of 3-D building components.
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HIGHLIGHTED PROJECTS
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 ALBERT EINSTEIN MEDICAL CENTER The Albert Einstein Medical Center is a teaching hospital offering a full range of advanced health services to the Philadelphia community and beyond. More>>
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 HATBORO
SEWER AUTHORITY TREATMENT PLANT The System upgrade at the treatment facility. More>>
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 MISSION FOODS The design for all HVAC, plumbing, fire protection, and electrical systems for a new 139,000 square foot Manufacturing and Administrative Facility. More>>
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 WEST CHESTER UNIVERSITY Upgrade of the existing medium voltage power system. More>>
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