Testo 420 Replacement Hood 610 x 1220mm

The Testo 420 replacement hood (610 × 1220mm) is designed for accurate volume flow measurement at large commercial diffusers and grilles. With an integrated flow straightener, it calms turbulent airflow before measurement — delivering high-precision volume flow results at outlets where standard square hoods fall short.

This hood mounts directly onto your existing Testo 420 volume flow hood base and comes with a carry bag. Not sure which hood size suits your diffusers? See our TAB commissioning guide or browse the full flow hood range at HVAC Shop AU.

Key Features

• 610 × 1220mm nominal dimensions — ideal for large rectangular diffusers and grilles
• Inner dimensions: 280 × 1195mm
• Integrated flow straightener for high-precision measurement results
• Minimum outlet requirement: 335 × 335mm
• Mounts directly to Testo 420 volume flow hood base
• Includes carry bag

Suitable For

• Large commercial HVAC balancing and commissioning
• TAB (Testing, Adjusting and Balancing) professionals
• Facility engineers auditing large-scale ventilation systems
• NEBB certified commissioning agents

What’s Included

• Replacement hood 610 × 1220mm (product no. 0554 4202)
• Carry bag