The ACR Air Kit measures two of the most important indicators of ventilation health: indoor CO₂ concentration and building pressurization. 

The CO₂ logger helps determine whether the amount of fresh outdoor air introduced into the space is sufficient for the number of occupants. Because people exhale CO₂, rising concentrations indoors signal that ventilation may not be keeping up with occupancy. Logging this data over time reveals how ventilation systems perform under real-world conditions—during peak use, at different times of day, or in response to HVAC cycling. 

The differential pressure sensor tracks whether the building or space is under positive, neutral, or negative pressure relative to an adjacent space or the outdoors. Maintaining slightly positive pressure is a recognized best practice in most conditioned spaces, as it helps prevent infiltration of unfiltered air, moisture, odors, and pollutants. Negative pressure, on the other hand, can result from excessive exhaust or insufficient makeup air and may cause cold drafts, humidity problems, or discomfort near exterior walls.

By monitoring both variables together, the kit helps you diagnose ventilation shortfalls, identify pressure imbalances, and validate whether your system is operating as intended—not just in theory, but under real, dynamic building conditions.

The kit includes a high-accuracy CO₂ logger, a low-pressure differential sensor, tubing, accessories, and a compact carrying case. Everything you need to begin field assessments is included.

Yes. While the two (CO2 and Pressurization) measurements work best together, each instrument can be deployed and used independently depending on the type of assessment you're doing.

Yes. Both the CO₂ and pressure sensors provide real-time measurements that can be viewed live for diagnostics or recorded over time for trend analysis. Here is an example (sped up five times for demo purposes) of the CO2 logger in a boardroom, communicating via bluetooth to a laptop from a distance of about 20 ft.

Yes. The kit supports long-term logging, making it ideal for capturing how ventilation and pressure vary with occupancy, system scheduling, or outdoor conditions.

Both loggers offer professional-grade accuracy and stability. Detailed specifications for each are provided in the kit’s datasheet or spec sheet.

The kit comes with software for both Mac and PC. If you're already familiar with ACR devices, you'll find the same easy interface and flexible reporting options.

Yes. The kit is commonly used in schools, offices, clinics, and commercial buildings—anywhere where ventilation effectiveness and indoor air quality are a concern.

The CO₂ and pressure data support ventilation assessments aligned with ASHRAE 62.1 and other standards, but specific compliance depends on how your jurisdiction enforces measurements. This kit gives you the data you need for credible documentation and decision-making.

This kit is designed for portable diagnostics rather than permanent BAS integration. For permanent installs, fixed sensors and BACnet-compatible devices may be more appropriate.