- Part number 0563 4200
- Rugged and durable 24″ x 24″ air flow capture hood weighs less than 6.4 lbs (with base)
- Large, tiltable, removable backlit display makes readings easy to see
- Flow straightener for more precise measurement at turbulent outlets
- App integration via Bluetooth for fast and easy monitoring and reporting on site
The new testo 420 flow hood system is a lightweight, accurate and convenient solution for balancing volume flow at registers and returns. At turbulent outlets, the patented flow straighteners significantly improve measurement accuracy & stability, save time and eliminate the uncertainty of measuring turbulent outlet ducts. Positioning is especially easy with its ergonomic handles, and low weight of fewer than 6.4 lbs. The optional tripod stand provides convenient handling when testing in large buildings, or at greater heights. The testo 420 flow hood has a wide variety of optional interchangeable flow skirts in different sizes and configurations. The lightweight testo 420 is easy to set up and disassemble and comes in a convenient rolling case.
In The Box
Measurement Specifications:
| Flow Volume | Flow Velocity | Air Flow Temperature | Differential Pressure | Absolute Pressure | Relative Humidity | Dew Point / Wet Bulb | |
| Measuring range | 25 to 2,300 CFM (40 to 4000 m³/h) | 0 to 2,750 ft/min (0 to 14 m/s) | -5 to 140°F (-20 to +60 °C) | -0.5 to 0.5 inWC (-120 to 120 Pa) | 700 to 1,100 mbar | 0 to 100 %RH | 20 to 140°F / (-104 to 140 °F) |
| Accuracy | ±3 % of m.v. (+7 CFM) | ±2.0 ft/m (0.01 m/s) | ±0.9 °F (20 to 140 °F) ±0.5 °C (-5 to 60 °C) | ±2 % of m.v. +0.02 | ±1.2 inWC ±3 mbar | ±1.8 %RH +3% m.v. | Not Specified |
| Resolution | 1.0 CFM | 0.01 ft/min (0.0001 m/s) | 0.1 °F | 0.000001 inWC | 0.1 mbar | 0.1%RH | 0.1 °F |
Exceptionally Light
The testo 420 air flow capture hood with ergonomic handles and tiltable display has an exceptional light weight of less than 6.4 lbs. This means that frequent volume flow calculations in large rooms and measurements above head height can be carried out reliably and comfortably. While in use, a large measuring button on the capture hood ensures easy recording of the measurements.
Removable Control Unit
The control unit of the testo 420 enables you to measure flow velocity, volume flow, absolute pressure, temperature, and relative humidity. The automatic zeroing ensures higher accuracy for low pressures. This integrated measuring control unit was not just developed for volume flow measurement at ceiling outlets, as it can be removed from the capture hood and be used for pressure, flow, and volume flow measurements in the duct. You only need to attach a pitot tube and connection hoses (both optional) for measurements in ducts. Timed and multi-point mean calculation, as well as the combination of the two, together with simple input of the duct geometry, provide you with accurate flow measurements in ducts. This means you can save on the purchase of an additional measuring instrument.
testo 420 App
The testo 420 app enables live measurement streaming of HVAC systems using a smartphone or tablet. The app features a start and stop function and enables you to save your measurement data in .txt format, and creates the measurement protocol directly on site. Measurement results, such as the overall volume flow and the air exchange rate, can be directly assigned to customer-specific folder templates. You can then send your readings and protocols via the in-app email function, saving you a considerable amount of time and increasing efficiency.
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