Hood (Capture Inlet) for Extraction Systems

Product Specifications

Technical details and manufacturing context for Hood (Capture Inlet)

Definition

The hood or capture inlet is the critical front-end component of an extraction hood or extraction arm system. It is specifically engineered to be positioned as close as possible to the emission source (e.g., welding fume, chemical vapor, dust, mist). Its primary function is to efficiently capture and contain airborne pollutants before they disperse into the surrounding workspace, ensuring effective local exhaust ventilation (LEV). The design of the inlet directly influences the capture velocity and overall efficiency of the extraction system.

This component is available in a range of configurations to suit different industrial applications. Materials commonly used include galvanized steel, stainless steel (grades 304 or 316), aluminum, and chemical-resistant plastics such as polypropylene (PP). The choice of material depends on the chemical compatibility, temperature, and mechanical requirements of the specific process. For corrosive environments, stainless steel 316 is often specified, while lighter materials like aluminum may be used where weight is a concern.

Key parameters that define the performance of the capture inlet include capture velocity (typically 0.5–2.5 m/s, per EN 1093-3), duct connection diameter (100–400 mm), face opening area (0.05–0.5 m²), operating temperature range (-20 to 120°C), material grade (304/316 per ASTM A240), wall thickness (1.0–3.0 mm), weight (5–50 kg), pressure drop (50–250 Pa), and noise level (60–85 dB(A) at 1 m, per ISO 3744). These values are reference ranges and must be confirmed for the specific model and application.

When selecting a capture inlet, it is essential to verify that the duct connection diameter matches the existing ductwork, and that the capture velocity is sufficient to contain contaminants at the source. The face opening area should be sized appropriately to achieve the desired capture efficiency without excessive airflow. Operating temperature limits must be respected; above 120°C, heat-resistant materials are required. Always consult the legal manufacturer or supplier to confirm model-specific values and compliance with applicable standards.

Working Principle

The hood operates based on the principle of local exhaust ventilation. A fan or blower creates negative pressure (suction) within the extraction ductwork. This suction draws air and contaminants into the hood's capture inlet. The shape, size, and positioning of the hood are designed to create an effective 'capture zone' that envelops the pollutant source, pulling the contaminated air into the extraction system for filtration or safe discharge. The capture velocity, typically 0.5–2.5 m/s, is critical; below 0.5 m/s contaminants may escape. The hood must be positioned as close as possible to the source to maximize capture efficiency.

Common Materials

Galvanized steel, Stainless steel (e.g., 304, 316), Aluminum, Polypropylene (PP) or other chemical-resistant plastics

Technical Parameters

Parameter	Typical range	Notes & selection driver
Capture Velocity	0.5–2.5 m/s	Below 0.5 m/s contaminants may escapeEN 1093-3
Duct Connection Diameter	100–400 mm	Match to existing ductwork
Face Opening Area	0.05–0.5 m²	Larger area lowers capture velocity
Operating Temperature	-20–120 °C	Above 120°C requires heat-resistant materials
Material Grade	304/316 SS	316 for corrosive environmentsASTM A240
Wall Thickness	1.0–3.0 mm	Thicker for structural rigidity
Weight	5–50 kg	Depends on size and material
Pressure Drop	50–250 Pa	Higher drop requires stronger fan
Noise Level	60–85 dB(A)	At 1 m distanceISO 3744

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Flange/Rim Part
Provides a stable mounting surface and helps define the capture zone geometry. Often includes a gasket for a better seal against work surfaces.

Material: Steel, aluminum, or plastic
Duct Connection Collar Part
The cylindrical or rectangular section that connects the hood to the flexible or rigid extraction ducting.

Material: Steel or aluminum
Mounting Bracket/Clamp Part
Allows for adjustable positioning and secure mounting of the hood onto an extraction arm or fixed stand.

Material: Steel
Sparks/Debris Baffle (optional) Optional Part
A mesh or perforated screen inside the hood to prevent large sparks or debris from entering the ductwork, used in applications like welding.

Material: Stainless steel mesh

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hood (Capture Inlet).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Extraction Hood/Arm

View system integration details

Manufacturers of Hood (Capture Inlet)

Manufacturer profiles associated with Hood (Capture Inlet).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What is the typical capture velocity range for this hood?

The typical capture velocity range is 0.5–2.5 m/s, as per EN 1093-3. Below 0.5 m/s, contaminants may escape. The required velocity depends on the emission source and distance; always verify with the manufacturer for your specific application.

What materials are available for the capture inlet?

Common materials include galvanized steel, stainless steel (304 or 316), aluminum, and polypropylene (PP) or other chemical-resistant plastics. For corrosive environments, stainless steel 316 is often recommended. Confirm material compatibility with your process.

How do I match the duct connection diameter?

The duct connection diameter ranges from 100 to 400 mm. It must match the existing ductwork of your extraction system. Measure the duct size and select a hood with a compatible connection. Consult the manufacturer for exact dimensions.

What is the maximum operating temperature?

The standard operating temperature range is -20 to 120°C. Above 120°C, heat-resistant materials are required. Always check the material's temperature rating and consult the manufacturer for high-temperature applications.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 0.5 bar differential
flow rate:	100-5000 m³/h (depending on size)
temperature:	-20°C to 120°C
slurry concentration:	Not applicable - designed for airborne contaminants only

Hood (Capture Inlet)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards