Large Vane Thermo-Anemometer

Extech AN300 Large Vane Thermo-Anemometer

High-accuracy volumetric airflow analysis for critical ventilation and climate control systems.

The Extech AN300 is a highly specialized thermo-anemometer built for advanced HVAC/R diagnostics, environmental audits, and industrial ventilation balancing. Designed with an integrated 10cm (4-inch) large vane, this instrument is engineered to capture a wider cross-section of air, delivering superior accuracy when measuring flow across large grilles and ducts.

By simultaneously calculating air velocity, airflow volume, and ambient temperature, the AN300 provides engineers and facility managers with the critical data required to verify system performance, ensure compliance with indoor air quality standards, and optimize energy efficiency in large-scale facilities.

Key Technical Capabilities

• Integrated Large Vane Sensor: The 10cm rotary vane design minimizes flow resistance and captures a larger sample area, drastically improving measurement stability on large return/supply grilles.

• Direct Airflow Volume: Automatically computes cubic feet per minute (CFM) or cubic meters per minute (CMM) directly on the display when the duct area is inputted.

• Advanced Averaging Algorithms: Features built-in multi-point and timed average calculations to ensure accurate volumetric flow assessments in complex or turbulent environments.

• Optional Cone Compatibility: Can be paired with specialized airflow cone kits (sold separately) to measure volumetric flow quickly and accurately without the need for manual duct dimension entry.

• Industrial Build & Data Management: Includes Min/Max data recording, a Data Hold function to freeze the current reading, and an auto-power-off feature to optimize field performance.

Technical Specifications Summary

Equip your engineering operations with precision volumetric flow analysis