HVAC TAB for Office Buildings
Comfort complaints, energy waste, and LEED certification requirements all trace to the same thing: whether the HVAC system is delivering what the engineer designed. TAB verifies that it is.
Office HVAC Is More Demanding Than It Looks
Office buildings present some of the most variable HVAC demands of any occupancy type. Perimeter zones with curtain-wall glazing experience massive solar loads that shift through the day. Open-plan floors have entirely different airflow needs than private-office configurations. High-density areas like conference rooms and trading floors can load an air handler far beyond what the base-building design anticipated.
When a tenant fit-out reconfigures space without a corresponding HVAC rebalance, the mismatch between system design and actual occupancy shows up as comfort complaints within weeks of move-in. When a building changes occupancy without updated ventilation verification, it may be delivering inadequate outdoor air to occupied spaces for years without anyone knowing.
dL Flow Tech has provided HVAC testing, adjusting, and balancing for office buildings across the Hudson Valley and New York metro since 1982. Our work on office buildings ranges from base-building commissioning of new construction to tenant fit-out TAB, comfort troubleshooting surveys, and LEED enhanced commissioning for certification projects.
What We Do
HVAC Services for Office Projects
Air Balancing
Measured and adjusted supply, return, and exhaust airflows at every terminal — VAV boxes, fan-coil units, diffusers, and grilles — certified to mechanical design.
Hydronic Testing & Balancing
Chilled and hot water flow set to design through coils, fan-coil units, and central plant equipment. Restores delta-T and eliminates starved coils.
ASHRAE 62.1 Ventilation Verification
Outdoor air quantities measured and documented against ASHRAE 62.1 minimum requirements for office occupancy. Required for LEED and most energy codes.
Duct Leakage Testing
Pressure testing of supply and return ductwork to verify leakage is within code or LEED limits. Required for LEED and common in NYC energy code projects.
Tenant Fit-Out TAB
Rebalancing after fit-out duct modifications to match the new space plan. Covers new diffuser locations, revised VAV zone boundaries, and updated airflow schedules.
HVAC System Surveys
Field investigation of existing systems before renovation design. Gives the engineer measured inputs for what the infrastructure can actually support.
Why It Matters
Independent TAB for Office Projects
On commercial office projects — whether new construction, renovation, or tenant fit-out — the mechanical contractor and the TAB firm are two different entities for a reason. The firm that installed the system has a financial interest in it being accepted. An independent firm has no interest other than accurate measurement.
When a TAB report is signed by a NEBB-certified firm that had no role in the installation, the engineer of record accepts it on first review. When it is self-reported by the mechanical contractor, it gets scrutinized. Independent TAB is not a formality — it is the difference between a report that closes the project and one that opens a dispute.
dL Flow Tech is not affiliated with any mechanical contractor, equipment manufacturer, or installation firm. Our reports reflect what we measured, not what the system was designed to do or what the contractor wants the engineer to accept.
No Contractor Affiliations
We have no financial relationship with any installing contractor. Our only interest is what the instruments say.
NEBB Certified
Reports signed and certified to NEBB procedural standards — the documentation the engineer of record requires.
Hudson Valley & NYC Metro
Based in Fishkill, NY. We serve Dutchess, Westchester, Orange, Putnam, Rockland, and Ulster counties, plus the five boroughs.
Send Your Office Project Drawings
Send the mechanical drawings and TAB specification section. We'll review scope and return a fixed-price proposal — not an open-ended estimate.
Frequently Asked Questions
Why does my office building need TAB?
HVAC systems are designed and installed to deliver specific airflows to each zone. Without TAB, airflows at individual diffusers and VAV boxes are rarely at design values — some zones get too much air, others too little. The result is comfort complaints, uneven temperature distribution, and energy waste. TAB measures actual airflow at every terminal, adjusts dampers and balancing valves to match design, and certifies the results in a signed report.
What is ASHRAE 62.1 and does it apply to offices?
ASHRAE 62.1 is the ventilation standard for most non-residential occupancies, including offices. It specifies minimum outdoor air quantities per occupant and per square foot of floor area. These minimums maintain acceptable indoor air quality. TAB verifies that the mechanical system is delivering ASHRAE 62.1 outdoor air minimums — which matters for occupant health, code compliance, and LEED certification.
What is involved in balancing a tenant fit-out?
A tenant fit-out typically involves reconfiguring ductwork and VAV boxes to match the new space plan. After construction, the HVAC system needs to be rebalanced to the new design — new diffuser locations, revised zone boundaries, and updated airflow schedules. We receive the mechanical drawings for the fit-out, measure actual airflows at each new terminal, adjust the system to match the design values, and certify the results.
Can TAB help resolve hot and cold complaints in my office?
Yes. Persistent hot or cold spots in office buildings almost always have a measured cause: a VAV box that is not opening fully, a balancing damper that is stuck, an out-of-balance hydronic coil, or a zone that is receiving far less airflow than design. An HVAC system survey identifies the measured cause and, if TAB is needed, we can rebalance the affected zones to correct it.
What is LEED enhanced commissioning and does my office project need it?
LEED enhanced commissioning is an independent commissioning process that goes beyond fundamental commissioning to review design documentation, verify installed equipment, and perform additional testing. If your office project is pursuing LEED certification, the energy and atmosphere credits for commissioning require an independent commissioning authority. dL Flow Tech can serve in that role, providing the documentation GBCI requires for the credit.