Air Balancing Services
Air balancing is the process of measuring and adjusting an HVAC air distribution system so that every space in a building receives the airflow specified in the mechanical design. It is a core component of HVAC testing, adjusting, and balancing and is performed after the mechanical system has been installed and started, but before the building is occupied. Without proper air balancing, rooms receive too much or too little conditioned air, ventilation rates fall short of code requirements, and the HVAC system operates at a permanent disadvantage to its design intent.
MGM Associates provides commercial air balancing services for a wide range of facility types throughout North Alabama and the Tennessee Valley. Our NEBB-certified technicians use calibrated field instruments to measure airflow at every terminal device in the system, compare those readings to the design values, and make the adjustments necessary to bring the system into balance.
What Is HVAC Air Balancing?
Air balancing involves systematically measuring supply, return, and exhaust airflows at every terminal device in an HVAC system (diffusers, grilles, registers, VAV boxes, fan coil units, and exhaust fans) and adjusting the system until each device delivers the volume of air specified in the mechanical design documents. The process also includes verifying air-handling unit performance: total supply and return airflow, outside air quantities, fan static pressure, and motor operating conditions.
For variable air volume systems, air balancing includes verifying the performance of VAV terminal units across their full operating range and coordinating with the controls contractor to confirm correct sequences of operation at minimum and maximum airflow positions. Proportional balancing methods are used to achieve system balance while maintaining the correct total airflow through the air-handling unit.
Why Air Balancing Matters
An HVAC system that has not been air balanced may deliver adequate total airflow from the air-handling unit while distributing that airflow unevenly across the building. Zones closest to the air handler may receive excess flow while distant zones are starved. The result is comfort complaints, code violations on ventilation, and energy waste as the system works harder than necessary to compensate for the imbalance.
- Every occupied space receives the design ventilation and conditioned airflow rate
- Ventilation requirements under ASHRAE 62.1 are documented and verifiable
- Fan energy consumption is optimized by eliminating excess static pressure from imbalanced dampers
- Comfort complaints related to hot and cold spots are identified and resolved at the system level
- The air-handling unit operates within its design envelope, reducing mechanical strain
- A certified airflow report provides documentation for commissioning, warranty, and operations purposes
Our Air Balancing Process
- Document Review. We review the mechanical drawings, equipment schedules, and airflow diagrams to understand design intent and identify all terminal devices requiring measurement.
- System Readiness Confirmation. We confirm that the mechanical installation is complete, systems are started and operating, and controls are functional before beginning field measurements.
- Initial Airflow Measurement. Using calibrated flow hoods, pitot tube traverses, and digital manometers, we measure airflow at every terminal device and record initial conditions.
- Air Handler Verification. Total supply and return airflows, outside air fractions, and fan operating conditions are measured and compared to design and equipment data.
- System Adjustment. Dampers, balancing devices, and terminal unit controllers are adjusted using proportional balancing methods until all zones are within tolerance of design values.
- Final Measurement and Reporting. Final airflow readings are taken at all devices. A certified TAB report documents design values, initial measurements, and final adjusted conditions for every system and terminal device.
Applications
Air balancing is required on virtually every commercial HVAC project. Facility types where proper airflow measurement and balancing is particularly critical include:
- Hospitals and healthcare facilities: airflow direction, air change rates, and pressurization relationships between spaces are all regulated and must be documented
- Universities and schools: ventilation rates directly affect occupant health and cognitive performance
- Commercial office buildings: VAV systems must be balanced across diverse occupancy types and internal loads
- Government and federal facilities: certified TAB is frequently specified and documentation requirements are stringent
- Industrial facilities: process ventilation and make-up air systems must be precisely coordinated with exhaust systems
Service Area
MGM Associates provides HVAC air balancing services throughout North Alabama and the Tennessee Valley. We work with mechanical contractors, general contractors, mechanical engineers, and facility managers on new construction and existing building projects across the region.
- Huntsville and Madison County, Alabama
- Guntersville and Marshall County, Alabama
- Decatur and the Tennessee Valley corridor
- Birmingham and North-Central Alabama
- Chattanooga, Tennessee
- Nashville and Middle Tennessee
Related HVAC Testing and Balancing Services
Air balancing is one component of a complete HVAC testing, adjusting, and balancing scope. Most commercial projects also require:
- Hydronic system balancing for chilled water, heating hot water, and condenser water systems
Request Air Balancing Services
Contact MGM Associates to discuss your project's air balancing requirements. We are available to review design documents, provide scheduling input, and coordinate with your mechanical contractor and commissioning team.
Contact MGM Associates