Certified & Independent
HVAC Testing & Balancing
dL Flow Tech is an independent, NEBB-certified testing, adjusting, and balancing firm based in Fishkill, New York. We measure, adjust, and certify HVAC systems for commercial, healthcare, laboratory, and institutional buildings across the Hudson Valley and NYC metro — using calibrated instruments and NEBB procedure, since 1982.
What We Do
HVAC Testing & Balancing Services
Every service is performed to NEBB procedure and documented in a certified report — the third-party verification owners and engineers require.
Testing, Adjusting & Balancing
Independent, NEBB-certified TAB — airflow and water flow measured, adjusted to design, and certified in a report the engineer of record accepts.
- Air Balancing
- Hydronic Testing & Balancing
- Duct Leakage Testing
- Blower Door Testing
- Sound Measurement
HVAC System Surveys
Systematic field investigation of existing HVAC systems — troubleshooting comfort problems, supporting design reviews, and documenting what the building actually delivers.
- Comfort Troubleshooting
- Pre-Construction Design Review
- Existing System Documentation
- Deficiency Reporting
Ventilation Verification & IAQ
Outdoor-air rates, room pressurization, and IAQ verification — the measured confirmation that the ventilation design is what the building actually delivers.
- Outdoor Air Verification
- Room Pressurization
- Healthcare & Lab IAQ
- ASHRAE 62.1 Compliance
Service Area
Areas We Cover
Based in Fishkill, New York, dL Flow Tech serves the greater tri-state region — the Hudson Valley up to Albany, western Connecticut, New York City, Long Island, and northern New Jersey.
Headquarters: 300 Westage Business Center Dr., Suite 404, Fishkill, NY — View on Google Maps
Who We Are
The Hudson Valley's Independent TAB Firm Since 1982
dL Flow Tech was founded by Dennis LaVopa in 1982 with a single principle: independent testing produces credible results. We're not affiliated with any mechanical contractor or equipment manufacturer. When we sign a TAB report, the numbers are ours alone.
Over four decades of Hudson Valley projects — hospitals, research labs, senior living communities, data centers, schools, and commercial buildings — we've built our reputation on the rigor of our procedure and the defensibility of our reports. The engineer of record doesn't have to take our word for it; the data speaks.
We use calibrated instruments on a documented schedule, follow NEBB procedural standards, and work across the full TAB scope — air balancing, hydronic balancing, duct leakage, blower door, and sound — so an owner gets one coordinated report, not disconnected pieces from multiple subcontractors.
40+
Years of TAB
NEBB
Certified Firm
NYC+
Service Area
100%
Independent
Founder
Dennis LaVopa
Dennis founded dL Flow Tech in 1982 after identifying a gap in the Hudson Valley market for genuinely independent TAB work. His background spans the full range of commercial and institutional mechanical systems — from chiller plants and hospital-grade isolation rooms to residential blower door testing. He holds NEBB certification and has overseen TAB and commissioning work on some of the region's most demanding projects over four decades.
Why Independence Matters
When the TAB firm is independent of the mechanical contractor, the report is genuine third-party verification — not the installer grading their own work. On regulated projects (hospitals, labs, LEED), that independence is a contractual requirement. On every project, it's the difference between a report the engineer stamps and one that gets sent back for rework.
Our Work
Featured Projects
TAB and commissioning work on some of the Hudson Valley's most demanding institutional and healthcare projects.
Healthcare
Northwell Health — Northern Westchester Hospital
Chiller-plant, air-handling, and hydronic TAB scope for a major regional hospital. Includes full hydronic plant balancing and certified pressure-relationship verification for patient-care spaces.
Senior Living
Broadview Senior Living
Full TAB scope — air balancing, hydronic balancing, and ventilation verification — to ensure comfort and code-compliant outdoor-air rates for all occupied spaces.
Healthcare / Specialty Care
The Center for Discovery — Specialty Children's Hospital
Air balancing, duct leakage testing, and certified room-pressure verification for a specialty children's hospital — among the most stringent TAB environments in the region.
Credentials
Certified, Affiliated, and Accountable
Our certifications and affiliations each require calibrated instruments, documented procedures, and recertification. When a spec calls for a certified TAB agency, these are the credentials that satisfy it.
Ventilation Verification
Your Ventilation Design on Paper Isn't Your Building's Air
Outdoor-air rates, room pressurization, and exhaust relationships are set during TAB. Without measured verification, there's no way to know whether a building's ventilation delivers what the engineer designed — or whether an occupied space is under-ventilated or pressurized incorrectly.
dL Flow Tech verifies ventilation rates to ASHRAE 62.1 requirements and certifies pressure relationships for healthcare, laboratory, and regulated environments where getting them wrong is a compliance — or patient-safety — issue.
Ventilation Verification ServicesOutdoor Air Rates
Measured and verified to ASHRAE 62.1
Room Pressurization
Certified pressure relationships for regulated spaces
Healthcare IAQ
Patient-room and isolation-room verification
Lab Fume Hood
Face velocity and containment testing
Get Started
Ready for a Fixed-Scope TAB Proposal?
Send your mechanical drawings and TAB specification section. We'll review them and return a fixed-scope proposal — not an open-ended hourly estimate.