24" x 48" Air Flow Capture Hood for testo 420

Optional 24" x 48" capture hood for use with the testo 420 air flow capture hood, for measurements at air inlets and outlets. Includes an integrated flow straightener for high-precision measurement results, with 23" x 47" inner dimensions. To ensure that the testo 420's measurement results are correct, this capture hood should be used with a minimum 13" x 13" outlet size.