Indoor Air Quality & Ventilation Auditing

Occupant safety

Verifying Fresh Air Dilution Volumes

Adequate air replacement is critical for removing carbon dioxide, airborne particulates, and chemical pollutants from building environments. If a ventilation system is not balanced, it can fail to introduce enough fresh outdoor air, causing carbon dioxide levels to rise and occupant comfort to decline. Precision Air Balancers L.L.C. provides certified ventilation audits to verify fresh air exchange rates.

We check the volume of fresh air intake grilles, verify that exhaust fans operate at design flow rates, and measure carbon dioxide levels in densely occupied areas. We provide detailed reports verifying that ventilation systems satisfy minimum fresh air dilution guidelines as set by municipal building codes and ASHRAE Standard 62.1.

Unbalanced ventilation can create positive or negative pressure envelopes. If a building is under negative pressure, it pulls in humid, unfiltered outdoor air through door seals, leading to indoor humidity spikes and potential mold issues. We use digital flow meters to measure intake volumes and adjust mechanical dampers. This calibration keeps rooms comfortable and ensures clean indoor air.

We work closely with facility directors and general building contractors during code compliance audits. Our technicians measure outdoor air volumes, adjust damper actuators, and verify system runtimes. We provide detailed reports verifying that mechanical systems conform to compliance criteria. Learn about our commercial air balancing or review our commercial kitchen balancing services.

ASHRAE Standard 62.1 Verification

We check commercial mechanical systems against ASHRAE Standard 62.1 ventilation requirements. We measure the actual volume of outdoor air introduced by the mechanical fans, verify that intake dampers are set correctly, and check filter pressure drops. Our reports help building managers confirm that the systems introduce enough outdoor air to maintain healthy environments, preventing sick building syndrome.

Building Pressure Profile Tuning

Maintaining a minor positive pressure relative to the outdoors prevents raw outdoor air, dust, and moisture from leaking in through gaps in the building envelope. We measure pressure differences across doors and walls using micro-manometers and adjust exhaust and supply fan outputs. This tuning keeps the building interior pressurized, improving HVAC efficiency and occupant comfort.

Carbon Dioxide Accumulation Rates & Dilution Ventilation

Carbon dioxide (CO2) is a natural byproduct of human respiration. In poorly ventilated spaces, CO2 levels can quickly accumulate, causing drowsiness, headaches, and a decline in cognitive performance for office workers and students. To prevent this, mechanical ventilation systems must introduce outdoor air to dilute indoor carbon dioxide. We monitor CO2 levels across office zones using infrared sensors to verify that fresh air circulation is sufficient.

We adjust fresh air dampers to maintain indoor carbon dioxide concentrations below 800 parts per million (ppm) under standard occupancy loads. If concentrations exceed this limit, we increase outdoor air intake rates or adjust control schedules. Dilution ventilation also helps exhaust VOCs, moisture, and indoor odors, maintaining clean and healthy indoor environments that conform to EPA guidelines.

Filtration Efficiency and Mechanical MERV Rating Calibrations

Ventilation systems rely on air filters to remove particulate matter, pollen, and dust. High-efficiency filters (such as MERV 13 or HEPA) have dense fibers that create high static pressure resistance. If the fan motor speed is not adjusted, installing high-MERV filters will significantly reduce airflow volumes. We measure filter pressure drops and adjust blower speed parameters to ensure the system delivers design airflow rates while maintaining particulate filtration levels.

Maintaining healthy ventilation rates requires regular checks on fresh air dampers and filter pressure configurations.