My name is Brian M. Curran, and I was hired by a mechanical contractor to create the HVAC shop drawings for a commercial building in Glen Oaks, NY.
What follows is a summary of this project. If you’re planning a project and need mechanical shop drawings, I’m available to help.
The Scope of Work
Above is a photo of the building where the work took place.
This project involved preparing HVAC shop drawings for the renovation of an existing building located on Union Turnpike in Glen Oaks, NY. The building was originally constructed in 1965 and previously operated as a one-story diner, as can be seen in the picture above. It was renovated, and an addition added, for use as a dental office. These changes required new HVAC systems and coordinated ductwork throughout the building.
The renovation included adding a new floor, a new roof, and a bulkhead, which significantly changed how air distribution needed to be handled. My shop drawing scope covered five levels of the building: the cellar, first floor, second floor, roof, and bulkhead roof. Because this was part existing structure and part new structure, duct routing and equipment coordination required close attention to be paid to the existing conditions.
The HVAC system consisted of three rooftop packaged units. One unit served the second floor, one served the first floor, and a third unit was installed and capped for future use. All rooftop units were mounted on dunnage rather than curbs, which affected how duct connections and transitions were detailed at the roof level.
Additional systems included cassette-type DX units serving the first-floor corridor and ducted concealed DX units serving the cellar. All air-conditioning units were concealed above ceilings and connected to the ductwork shown in the shop drawings.
Exhaust systems served storage areas, restrooms, electrical rooms, and sewer rooms. Storage and general exhaust air was handled by a roof-mounted exhaust fan, while restrooms used ceiling-mounted fans tied into a common exhaust duct. Fresh air was supplied to each indoor unit by individual fresh air fans connected to a common fresh air duct.
Air distribution varied by level. The cellar used square supply and return diffusers with exhaust registers, while the upper floors used linear bar diffusers. Return air was generally handled through the ceiling plenum, with transfer ducts shown where required. Both rectangular and round ductwork were used throughout the building.
Insulation requirements followed the project specifications. Supply and return ducts are insulated with a 1” liner for the first ten feet from the FCU or RTU outlet, then continue with 2” wrapped insulation beyond that point. Fresh air ducts are insulated with 2” wrap, while exhaust ducts are left uninsulated. Manual volume dampers are included on supply branches to allow for proper air balancing.
During the shop drawing phase, coordination issues arose due to limited ceiling space and multiple ducts needing to pass through the same areas. The drawings addressed these conditions by adjusting routing and clearances so ducts could be installed without conflicts with structure or other systems.
The Commercial HVAC Shop Drawings
Below are the commercial hvac shop drawings I created for this project. Please click the image to launch the PDF.
Contact
With 18 years of experience, if you need HVAC shop drawings for a renovation or new construction project, you can contact me today at 718.441.3968, text me today at 646.504.5230, or email me today at brian@draftingservices.com. I work directly with mechanical contractors to produce clear, coordinated shop drawings based on the project specifications and field conditions.