Overview: Expand Your Measurement Capabilities

The Testo 420 Replacement Hood (1200 x 1200 mm) is an essential accessory designed to significantly extend the measurement range of your Testo 420 volume flow hood. This generously sized hood allows professionals to accurately capture air volume from large square air diffusers and grilles that are often too big for standard measurement hoods. It ensures comprehensive coverage and reliable data collection across a wider array of HVAC systems.

Engineered for seamless integration, this replacement hood maintains the core functionalities of the Testo 420 system, including its critical integrated flow straightener. This feature is paramount for conditioning turbulent airflows, guaranteeing high-precision and stable results even in the most challenging and non-uniform ventilation environments. With its robust construction, it's built to withstand the rigors of frequent field use in commercial and industrial settings.

Why It Matters: Precision for Oversized Diffusers

Accurate air balancing is critical for optimal HVAC system performance, energy efficiency, and occupant comfort. For large-format diffusers common in modern commercial and industrial buildings, traditional measurement methods can be cumbersome and prone to error. This 1200 x 1200 mm replacement hood provides a direct, efficient, and highly accurate solution, eliminating the need for complex traverse measurements and significantly reducing commissioning time. It ensures that even the largest air terminals are balanced precisely, contributing to a well-performing and compliant ventilation system.

What's Included: Ready for Action

• 1 x Replacement hood for Testo 420 (1200 x 1200 mm)
• 1 x Carrying bag (Product no. 0554 4204)

Features & Benefits: Enhanced Measurement Performance

• Large Coverage Area: The 1200 x 1200 mm footprint is ideal for balancing high-capacity ceiling diffusers and large square ventilation grilles, expanding your measurement capabilities.
• Integrated Flow Straightener: Corrects turbulent inflow at large outlets, ensuring consistent accuracy even when the air distribution is uneven, saving time on re-measurements.
• Perfect Compatibility: Designed for an easy, secure snap-on fit with your existing Testo 420 measurement base, allowing for quick setup and reliable operation.
• High-Durability Build: Manufactured from robust materials that withstand the physical stresses of field usage in commercial and industrial sites, ensuring long-lasting performance.
• Reduces Measurement Time: Enables rapid, one-person balancing of large-format diffusers that would otherwise require complex and time-consuming traverse measurements.

Applications: Where This Hood Excels

• Commissioning high-volume air supply and exhaust terminals in large commercial and industrial facilities.
• Balancing large-format diffusers in warehouses, manufacturing plants, large commercial lobbies, and auditoriums.
• Performing accurate air volume measurements in systems with turbulent or uneven airflow from oversized grilles.
• Essential for professional commissioning engineers and commercial TAB (Testing, Adjusting, and Balancing) technicians.

Technical Specifications

Tradie Pro Tip: Measuring large diffusers can be tricky because the air velocity is often uneven across the face of the grille. The integrated flow straightener is a massive time-saver here—it physically "levels out" the air before it reaches the sensor array, giving you a steady, reliable average reading the first time without having to perform multiple re-takes. Always confirm proper sealing around the diffuser to avoid stray air influences.

Pair With: Complete Your Testo 420 System

To get the most out of your 1200 x 1200 mm replacement hood, ensure you have the core Testo 420 Volume Flow Hood measurement base. For smaller diffusers or unique shapes, explore our range of Testo 420 accessory hoods and funnels. Complement your airflow measurements with precise temperature and humidity data using a Testo temperature and humidity meter.

Keep Your Space Clean: Maintain Optimal Airflow

Invest in accurate air balancing for improved indoor air quality and system efficiency. This replacement hood empowers you to achieve precise results, ensuring every cubic meter of air is accounted for. Elevate your HVAC commissioning and maintenance tasks today.