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TSI and Alnor Air Flow Instruments

The TSI and Alnor brands have become virtually synonymous with top notch air flow measurement tools. Whether you need to measure air velocity by traversing ductwork, calculate air volume entering a HVAC return, measure system pressures to ensure correct operation, or balance the amount of conditioned air exiting diffusers, TSI and Alnor air flow tools offer accurate and repeatable solutions.