Testo 420 Replacement Hood 360 x 360mm

The Testo 420 replacement hood (360 × 360mm) is designed for accurate volume flow measurement at standard square air inlets and outlets. With an integrated flow straightener, it delivers high-precision results even at turbulent diffusers — making it the right choice when your standard 610 × 610mm hood is too large for the outlet you’re testing.

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 hood selection guide or browse the full flow hood range at HVAC Shop AU.

Key Features

• 360 × 360mm nominal dimensions — ideal for standard square diffusers
• Inner dimensions: 335 × 335mm
• 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

What’s Included

• Replacement hood 360 × 360mm (product no. 0554 4200)
• Carry bag

Instructions & Manuals

• Testo 420 Data Sheet (PDF)