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We specialize in Testing, Adjusting & Balancing services that ensure your HVAC systems operate at peak efficiency with documented performance verification.
An air balancing report — also called a TAB report (Testing, Adjusting and Balancing) or air balance report — shows how much air each part of an HVAC system actually delivers, compared with what the mechanical engineer designed. An independent balancing technician measures the airflow at every supply diffuser, return and exhaust grille and at the equipment, adjusts dampers and fan speeds to bring the system to design, then records the final values, the percentage of design and any deficiencies.
Engineers, general contractors, owners and inspectors ask for it at the end of new construction and fit-outs (often before the engineer's general review and occupancy), after renovations or equipment replacement, for clinics and labs that must document air changes per hour, and when occupants complain about hot, cold or stuffy rooms. GreenTech Air Balancing produces air balancing reports for commercial, institutional and residential projects across Ottawa, Gatineau and the Outaouais, following AABC and NEBB procedures, in English or French. Opening a restaurant or a small fit-out? See our air balance report for occupancy.
Example excerpt with illustrative values — not from a real project. A full report also lists the instruments used and their calibration dates, the test method, and every terminal on every system.
| Tag | Location | Type | Design (CFM) | Measured (CFM) | Measured (L/s) | % of design | Notes |
|---|---|---|---|---|---|---|---|
| D-1 | Office 101 | Supply | 150 | 146 | 68.9 | 97% | |
| D-2 | Office 102 | Supply | 150 | 158 | 74.6 | 105% | |
| R-1 | Corridor | Return | 400 | 389 | 183.6 | 97% | |
| E-1 | Washroom | Exhaust | 75 | 0 | 0.0 | 0% | No airflow — exhaust fan EF-1 not running (deficiency reported) |
The acceptable tolerance is set by the project specification (commonly ±10% of design at terminals). Values outside tolerance are adjusted or listed as deficiencies.
Send us the mechanical drawings or photos of the equipment — (613) 263-7916 · (819) 329-9551 · info@gtairbalancing.com. Quote within one business day.
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1
We begin with a detailed review of the HVAC systems to understand design intent, current operating conditions, and performance gaps. Our team evaluates airflow, waterflow, static pressure, and control sequences to establish an accurate baseline before any adjustments are made.
2
Using industry-standard TAB instruments, we perform precise field measurements across the entire system — diffusers, grilles, VAV boxes, terminal units, hydronic loops, and mechanical equipment. Each measurement follows recognized balancing procedures to ensure repeatable and reliable results.
3
Once optimal performance is achieved, we compile a comprehensive report including measured data, compliance verification, system observations, and corrective recommendations. Our documentation is structured for engineers, consultants, and facility managers to support long-term building efficiency.
Independent HVAC Testing, Adjusting & Balancing firm serving Ottawa–Gatineau, the Outaouais, Eastern Ontario and Western Québec.
Our work follows recognized industry standards and procedures (AABC, NEBB, ASHRAE, SMACNA) to deliver accurate airflow, reliable system performance and better indoor air quality for our clients.
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