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Extraction hoods for effective capture at the source
The extraction hood serves as the interface between the emission source and the extraction system. Its geometry, size, and position significantly determine how reliably smoke, dust, vapors, or aerosols are captured. A properly positioned extraction hood can therefore be more effective than simply increasing the fanās power.
In this category, you will find
ā Funnel hoods for localized emission sources
ā Extraction panels for larger work areas
ā Extraction slots for linear coverage
ā Swivel hoods for changing work positions
ā Safety nets and quick couplings
ā Retrofitting capture elements
Hood shape and distance
Small funnel-shaped hoods provide high local containment in the immediate vicinity. Panels and extraction slots cover larger areas but generally require more air to do so. The hood should be positioned as close as possible to the source and in the natural direction of the contaminantās movement.
Connection diameter and air flow rate
Cross-sections that are too small increase pressure loss and noise; cross-sections that are too large can result in low transport speeds when the air is laden with dust. The hood, connection, ducting, filtration unit, and fan must therefore be designed in conjunction with one another.
Typical Applications
ā Welding, soldering, and bonding
ā Grinding, Polishing, and Deburring
ā Mixing, dosing, and decanting processes
ā Machine and Process Exhaust Systems
ā Laboratory, testing, and training positions
Common Mistakes
ā Hood too far from the source
ā Hood positioned against the direction of fabric movement
ā Too large an open area with insufficient airflow
ā Connection cross-section not matched
ā Disturbing airflows caused by drafts are not taken into account
FAQ
Is a larger hood always better?
No. A larger open area usually requires more air. The key is to have a geometry that matches the source.
When is an extraction panel a good choice?
For larger or extensive emission areas.
What is an extraction slot used for?
For longer or linear emission sources.
Why is spacing so important?
The detection rate decreases very rapidly outside the hood as the distance increases.
Advice on Extraction Hoods
Information regarding the contaminant, direction of spread, source size, working distance, and available air flow rate will help with selection.
