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Select an extraction hood suitable for the application
Extraction hoods capture exhaust gases directly at the vehicle and are therefore a critical component for the effectiveness of the entire system. The shape, opening cross-section, position, and connection diameter influence how reliably the exhaust plume is captured and how high the additional pressure loss is.
Here’s what you should look for when making your selection
✔ Shape and location of the vehicle’s exhaust tip
✔ Required coverage scope
✔ Connection diameter for the exhaust hose
✔ Distance and position relative to the tailpipe
✔ thermal stress
✔ Operation and Vehicle Movement
Direct measurement on the vehicle
The closer the sensing is performed to the outlet, the less ambient air needs to be drawn in additionally. This improves efficiency in many applications. At the same time, the capture element must not interfere with vehicle operation or be subjected to excessive mechanical stress.
Typical Designs and Applications
Depending on the work site, open funnels, tailpipe adapters, or other vehicle-mounted capture elements may be suitable. The appropriate design depends, among other things, on whether the vehicle is a passenger car, van, commercial vehicle, emergency vehicle, or special-purpose vehicle, as well as on the geometry of the tailpipe.
| Criterion | Impact | Planning Note |
|---|---|---|
| Opening | Specifies coverage area | Do not interpret too broadly |
| Connection | affects the transition to the hose | Avoid jumps in context |
| Position | affects data capture quality | as close as practicable to the outlet |
| Temperature | Specifies material requirements | Assume real operating conditions |
Common Planning Mistakes
Excessive gaps between the outlet pipe and the hopper, improper positioning, and unnecessary cross-sectional constrictions reduce the collection efficiency. Likewise, one should avoid selecting a hopper that, while geometrically compatible, is not thermally or mechanically suitable for the application.
FAQ
Does the hopper have to be attached directly to the tailpipe?
Not mandatory, but capturing the information as closely as possible generally improves the quality of the entry.
Is a larger hopper always better?
No. Larger openings can draw in more ambient air, thereby increasing the required flow rate.
Why is the connection diameter important?
Inappropriate transitions can cause additional pressure losses.
Can the same funnel be used for all vehicles?
Not always. Vehicle and exhaust pipe geometries differ significantly.
When does temperature need to be taken into account?
Whenever the hopper or adjacent components are exposed to high exhaust gas temperatures.
What should be kept in mind when dealing with moving vehicles?
The design must be compatible with the sequence of movements and must not interfere with safe operation.
Selection Guidance
To make the right selection, the tailpipe geometry, vehicle type, connection diameter, exhaust gas temperature, and the existing hose system should all be considered together.
