Neometrix / Air & Extraction / Fume Extraction System / NMX-FXS-88

NMX-FXS-88 · ENGINEERED-TO-ORDER CLASS — SURVEY · CAPTURE · CONVEY · CLEAN · DISCHARGE · PROVE

Fume Extraction System. Catch it at the source.

Name: Fume Extraction System
Brand: Neometrix
SKU: NMX-FXS-88

A fume extraction system draws fume, mist and vapour away at the point where it is made, before it spreads into a room or reaches the breathing zone of the person at the work. Neometrix engineers it as a system: hoods, arms and enclosures at the source, ducting with balancing dampers, a filter stage chosen for the fume, a fan, a discharge point and controls.

So the system has to catch the fume at the source, carry it away without starving the room, and clean it before it is let out.

Discuss a fume extraction system Capability note (PDF)

A fume extraction unit on a plain white studio background: a compact pale grey steel cabinet with a blank front on four castor wheels, a ribbed pale grey flexible duct on a jointed stainless arm rising from its top and reaching out and down to a round stainless hood with a wide flat flange rim, a stainless handle at the back, and no people

Fig · 01 — A fume extraction unit: the filter and the fan in one cabinet on castors, and a flexible arm that reaches the hood to the work — illustrative render.

The result

fume drawn off at the sourceand a room that stays clear

The capture

a hood close to the work, or an enclosurewith a flange and no draught across it

The filter

chosen for the fumepre-filter, fine filter, carbon, scrubber

The air

made up as fast as it is takenand let out away from the intakes

Status

engineered to orderno delivered installation claimed

ISO 9001ISO 14001EN 14175 reference standard

Overview

Why the fan is the easy part, and the hood and the filter decide the result.

Because a large fan will move a great deal of air, and that air does little good unless the hood is close enough to the fume to catch it.

A fume hood with a flange on a plain white studio background: a round brushed stainless funnel-shaped hood with a wide flat flange ring around its open mouth and a dark smooth interior, joined by a short neck to a ribbed pale grey flexible duct curving away to the right, held on a slim stainless stand with a round foot, and no people

Fig · 02 — A hood with a flange: the flat rim stops air arriving from behind it, so more of what it draws comes from the work — illustrative render.

Catch it at the source.

What the system is for

It takes soldering and welding fume, chemical mist and vapour, fume from heated baths and process lines, and the gas from charging and test rooms away at the place it is made. It keeps the fume out of the breathing zone and out of the room.

Why the hood goes to the fume

The air a hood draws in falls off quickly with distance from its face. A plain opening pulls strongly only close to it. So the hood is brought to the fume, on an arm or fixed beside the work, and not left far away behind a bigger fan.

Why a flange or an enclosure

A flange around the opening stops air arriving from behind the hood, so more of what it draws comes from the front, where the fume is. An enclosure around the source needs the least air of all, because the fume has nowhere else to go.

Why cross-draughts matter

A door, a fan or a person walking past can blow the fume away from the hood. So the hood is placed and shielded so that no draught crosses its face.

Why the air must be made up

Air taken out of a room has to come back in. Without make-up air the system starves, the hoods draw less, and doors pull. So the air is supplied, and supplied gently, so that it does not blow across the hoods.

Why the filter is chosen for the fume

Particles need a pre-filter and then a fine filter. Vapours and odours need activated carbon, behind a pre-filter or it clogs. Acid and reactive gases need a scrubber or a treated medium. A filter loads as it works, so a pressure reading across it says when to change it.

Why the discharge and the proof

The cleaned air is let out away from the air intakes, so that it is not drawn back in. And the system is proved by measuring the air at each hood and by a smoke test, because a system that looks right can still miss the fume.

The method

Survey, capture, convey, clean, discharge, and prove.

Six steps in a fixed order. The survey and the proof are the two that a quick job skips.

1 · Survey

The fume, where it is made, how it moves and how the work is done are noted for each source, and the sources are grouped by what they need.

2 · Capture

A hood, an arm or an enclosure is chosen for each source and put as close as the work allows, with a flange and a shield against draughts.

3 · Convey

Ducting carries the fume to the unit, with balancing dampers so that each hood gets its share, and with no low points where liquid can collect.

4 · Clean

A pre-filter, a fine filter, a carbon stage or a scrubber takes out what the fume carries, with a pressure reading across each stage.

5 · Discharge

A fan draws the air through, and a stack lets it out away from the air intakes, while make-up air comes back into the room.

6 · Prove

The air at each hood is measured and balanced, a smoke test shows the capture, and the record is handed over with the system.

Which control, which job

Control	How it works	What to watch
General ventilation	mixes the fume into the room air and carries it away	it spreads the fume through the room first, so it suits only a weak and harmless source
Hood or arm at the source (this page)	draws the fume in before it spreads	the hood must be close, with no draught across its face
Enclosure or fume cupboard	contains the work and draws air in through an opening	the most protective, and the work has to fit inside
Personal protection	protects one person at a time	it leaves the fume in the room, and it is the last line and not the first

The step people underrate is the distance. A hood moved further from the work does not draw a little less; it draws far less.

Work content

What the system contains, element by element.

Read it as a checklist: a system missing a row will move air, but it will not keep the fume out of the room.

A ducted fume extraction system on a plain white studio background: three round stainless hoods with flat flange rims on slim stands, each joined by a ribbed pale grey flexible duct to a branch of a stainless main duct with a round damper in each branch, the main duct running to a large pale grey filter housing with a blank access door, then a fan with an electric motor, and a tall stainless stack rising from the fan, and no people

Fig · 03 — A ducted system: hoods on branch ducts with a damper in each, a main duct to a filter housing and a fan, and a stack that lets the cleaned air out — illustrative render.

Element	What it does	What matters
Hoods and arms	draw the fume in at the source	fitted with a flange, placed close to the work, and easy to put back in position
Enclosures and booths	contain the source	the least air for the best capture, with an opening that the work can pass through
Ducting	carries the fume	smooth and sealed, with no low points, in a material that agrees with the fume
Dampers and balancing	share the air between the hoods	set and locked, so that each hood draws what it needs
Filter housing	takes out the particles	a pre-filter and a fine filter that can be changed without spilling what they hold
Carbon stage	takes out vapours and odours	behind the pre-filter, and changed on a reading and not a guess
Scrubber	takes out acid or reactive gas where the fume needs it	with its liquid, pump and drain, for fume that a dry filter cannot hold
Fan and drive	move the air	chosen for the resistance of the whole duct and filter, with a drive that can be turned down
Discharge stack	lets the cleaned air out	placed away from the air intakes, and shielded from rain
Make-up air	replaces what is taken out	supplied gently, so that it does not blow across the hoods
Controls	run the system and keep it safe	a flow switch at each group of hoods, a pressure reading across each filter, and an interlock that stops the process when the extraction fails
Procedure and record	fix the survey, the settings and the proof	the same for every system, with the air at each hood on record
Testing & documentation	prove the system first	the air at each hood measured, a smoke test, the interlock exercised, and a record the customer can inspect

The elements that decide the result are the hoods and the make-up air, and the one that decides whether it stays safe is the interlock. The first two keep the fume captured and the system fed, and the third stops the process when the extraction fails.

Full specification — expand

System	Hoods, arms and enclosures at each source, with a flange and a shield against draughts; sealed ducting with balancing dampers; a filter housing with a pre-filter and a fine filter; an activated carbon stage for vapours and odours; a scrubber where the fume needs one; a fan and a drive that can be turned down; a discharge stack away from the air intakes; make-up air; controls with a flow switch, a pressure reading across each filter and an interlock that stops the process when the extraction fails; a written procedure; a record of the air at each hood; and testing and documentation before handover
The One Idea	Catch it at the source.
Why The Hood Goes To The Fume	The air a hood draws in falls off quickly with distance from its face, so a plain opening pulls strongly only close to it; the hood is therefore brought to the fume, on an arm or fixed beside the work, and a bigger fan far away does not make up for the distance
Why The Air Must Be Made Up	Air taken out of a room has to come back in; without make-up air the system starves, the hoods draw less and doors pull, so the air is supplied, and supplied gently so that it does not blow across the hoods
Why The Filter Is Chosen For The Fume	Particles need a pre-filter and then a fine filter, vapours and odours need activated carbon behind a pre-filter, and acid or reactive gases need a scrubber or a treated medium, and a filter loads as it works, so a pressure reading across it says when to change it
Standards	EN 14175 covers laboratory fume cupboards and ISO 21904 covers equipment for air filtration in welding and allied processes, and the ACGIH manual Industrial Ventilation: A Manual of Recommended Practice for Design is a public design reference. This page prints none of their velocities, flows, efficiencies or limits, and no edition year: those come from the standard the customer names. Approval of a system rests with the customer and the authority they name; none is claimed here
Configurations	Source-capture units, a ducted central system, and a system with a scrubber
Scope Boundary	This page is the fume extraction system, which takes fume away at the source in a workplace. It is not a battery abuse test chamber with a gas scrubber, which makes gas on purpose and scrubs it (see battery abuse test chamber with gas scrubber), not a chemical cleaning bay, which is a heated detergent wash bay (see chemical cleaning bay) and not an incinerator, which burns waste and treats its flue gas (see marine and industrial incinerator). It does not make an area safe for a flammable vapour: that needs a hazardous-area design. No certification or accreditation is claimed here
Status	Neometrix has quoted against successive fume extraction system requirements, and no delivered fume extraction system is claimed.

Configurations

One method, three ways to build the system.

The method, the capture rules, the make-up air and the proof are shared. What changes is how many sources there are and what the fume carries.

Source-capture units

Arms and hoods on a small unit, for one workstation or a few

For a bench or a few benches: flexible arms or fixed hoods on a unit with its own filter and fan, set beside each worker, with the discharge into the room or ducted out.

Ducted central system

Many hoods on one filter and fan, balanced and monitored

For a shop or a line: hoods and enclosures on ducting to one filter bank and fan, with dampers set so that each source gets its share, make-up air and an interlock to the process.

System with a scrubber

For acid and reactive fume that a dry filter cannot hold

For chemical and process fume: the ducted system with a scrubber stage, its liquid circuit and drain, and a discharge kept clear of the air intakes.

And the part that is not equipment at all, yet decides all three: the survey and the test plan. They fix the sources, the distance from each hood to its work, the air each one needs, the order of the filter stages and the checks at handover. They are written from the customer's own work and fume, not from the unit.

The drawings

A reference set, drawn as real CAD sheets.

Two sheets of one reference configuration: the process and instrument schematic of a fume extraction system, and its general arrangement with three details. They show the hoods, the ducting, the filter stage, the fan and the stack, how the capture falls with distance, the flange and the interlock that stops the process. They carry tags and letters only. Every velocity, flow, distance and efficiency is fixed by design for the customer's work and fume.

Fig · 04 — Sheet 01, the process and instrument schematic: the hoods, the main duct, the filter stage, the scrubber, the fan and the stack, and what holds or releases the process. Reference configuration, tags only.

Reference drawing sheet two, the general arrangement and details of a fume extraction system. A plan shows a room with three workstations, a hood on an arm above each, a main duct along the back wall leading to a plant area with a filter housing, a fan and a stack, and a make-up air grille in a side wall. An elevation shows a hood above a source, the filter housing, the fan and the stack, with dimension letters for the distance from the hood to the source, the height of the stack and its distance from an air intake. An item list numbers ten parts. Detail A shows how the capture falls with distance from the face of a hood. Detail B compares a hood without and with a flange. Detail C shows the filter stage in order with a pressure reading across it. A title block stamped reference configuration, not for construction

Fig · 05 — Sheet 02, the general arrangement and details: the room in plan and elevation, how the capture falls with distance, the flange and the filter stage in order. Reference configuration, letters only.

Every real system is drawn for its own sources, fume, room and site. These sheets are the arrangement and the order of control that a project set starts from. Approval of any drawing rests with the customer and the authority they name; none is claimed here.

PDF · two sheets

Reference drawings — schematic and arrangement

PDF · capability sheet

Fume extraction system — what Neometrix engineers

Where it is used

Wherever work gives off fume, and the person doing it has to breathe.

The common thread is a source that is small and close to a person, a fume that rises into the breathing zone, and a room that would otherwise fill with it.

Electronics and soldering workshops

Where flux fume rises from every bench and a hood has to sit right at the joint.

Welding and fabrication shops

Where the fume is made at a moving point, so an arm or a hood has to follow the work.

Laboratories and process rooms

Where chemicals are handled in small amounts and the fume has to be drawn off before it reaches the room.

Charging, cleaning and plating areas

Where heated baths, charging banks and process lines give off fume and vapour all day.

Watch

See it in motion.

A short walkthrough video of the fume extraction system.

FAQ

Common questions.

Longer answers, for readers who want the reasoning.

Q · 01 What does a fume extraction system actually do?

It draws fume, mist and vapour away at the place where it is made. A hood, an arm or an enclosure catches it, ducting carries it to a filter stage chosen for what it carries, a fan moves the air, and a stack lets the cleaned air out away from the intakes. Make-up air replaces what was taken, and controls watch the flow and the filters. It does not decide how much fume a process may give off or what the safe level is: those come from the customer's own rules, and the system holds to them.

Q · 02 Why does the hood have to be so close to the work?

Because the air a hood draws in falls off quickly with distance from its face. Close to the opening the air moves fast enough to carry the fume in. A little further away it hardly moves at all, and the fume rises past the hood into the room. Doubling the fan does not fix that: it makes the system louder and dearer and barely changes the air at the work. So the survey asks how close each hood can sit, and the answer sets the rest of the design.

Q · 03 Why a flange, an enclosure, and no draught across the hood?

A flange is a flat rim around the opening. It stops air arriving from behind the hood, so more of what the hood draws comes from the front, where the fume is, and the system can use less air. An enclosure goes further: it surrounds the source, so the fume has nowhere to go and the least air is needed. A draught across the face of a hood does the opposite. A door, a fan or a person walking past can carry the fume away before the hood has a chance to catch it, so the hood is placed and shielded against it.

Q · 04 Why must the air be made up, and how is the filter chosen?

Air taken out of a room has to come back in. If it does not, the system starves, the hoods draw less than they should, and doors pull open or slam. So make-up air is supplied, gently, so that it does not blow across the hoods. The filter follows the fume. Particles go to a pre-filter and then a fine filter. Vapours and odours go to activated carbon, which is placed behind a pre-filter or it clogs. Acid and reactive gases go to a scrubber or a treated medium. Every filter loads as it works, so a pressure reading across it tells you when it is time to change it.

Q · 05 Is this the same as the battery abuse test chamber with a scrubber, the chemical cleaning bay or the incinerator?

No, and the differences are worth stating precisely. The battery abuse test chamber with gas scrubber page covers a test chamber that makes gas on purpose and scrubs it. The chemical cleaning bay page covers a heated detergent wash bay. The marine and industrial incinerator page covers burning waste and treating its flue gas. This page is the fume extraction system, which takes fume away at the source in a workplace. It does not replace any of them, and it does not claim what they claim a second time.

Q · 06 Has Neometrix built one of these?

We would rather answer this plainly than let a page imply otherwise. Neometrix has quoted against successive fume extraction system requirements, and no delivered fume extraction system is claimed. What stands behind the offer is adjacent: Neometrix engineers a battery abuse test chamber with a gas scrubber (see the battery abuse test chamber with gas scrubber page), a chemical cleaning bay (see the chemical cleaning bay page) and a marine and industrial incinerator (see the marine and industrial incinerator page). The fans, filters, scrubber parts, ducting, dampers and instruments are catalogue items, bought in, not invented. What Neometrix engineers is the system around them: the survey, the hoods and enclosures, the duct layout and balancing, the choice and order of the filter stages, the discharge, the make-up air, the interlock, the procedure and the record. So the honest position is that the system is engineered to order, the neighbouring disciplines are in the building, and the first system of this exact kind will be built around the customer's own work and fume rather than taken off a shelf.

Q · 07 Which standard applies, and what can the system not do?

EN 14175 covers laboratory fume cupboards and ISO 21904 covers equipment for air filtration in welding and allied processes, and the ACGIH manual Industrial Ventilation: A Manual of Recommended Practice for Design is a public design reference. This page prints none of their velocities, flows, efficiencies or limits, and no edition year: those come from the standard the customer names. The system takes fume away, cleans it and lets it out. It does not make an area safe for a flammable vapour, which needs a hazardous-area design, it does not decide the safe level of a fume, and it does not replace the customer's own exposure checks: this page claims no certification or accreditation. No velocity, flow, distance, efficiency, size or quantity figure is printed here, and approval for use rests with the customer and the authority they name; none is claimed here.

Q · 08 What do you need from us to quote?

Six things, and most of them describe your work rather than the system. First, the sources: what gives off the fume, where, and how the work is done. Second, the fume: what it is, whether it is a particle, a vapour or an acid gas, and whether it is flammable. Third, the room: its layout, its doors and fans, and where the air intakes and discharge can go. Fourth, the process: whether it can be stopped when the extraction fails. Fifth, the supplies: power, water and drain. Sixth, the record: what you want kept for each hood. From that we come back with a system concept, a written test plan you can check, and a budgetary price.

The neighbouring pages, and how they differ from this one.

Three neighbours: one scrubs a gas it makes on purpose, one is a wash bay, one burns waste.

↗ Scrubbing

Battery Abuse Test Chamber with Gas Scrubber

A test chamber that makes gas on purpose and scrubs it - where this page takes fume away at the place a workplace makes it.

↗ Wash bay

Chemical Cleaning Bay

A heated detergent wash bay for parts - the kind of bay whose fume and vapour this page draws off.

↗ Flue gas

Marine and Industrial Incinerator

Burns waste and treats its flue gas - a different job from catching fume at a bench or a bath.

Browse all Neometrix product lines.

Get a quotation

Tell us the sources,
and what they give off.

The projects desk replies within two working days with a system concept, a written test plan you can check, and a budgetary quotation. Write to [email protected] or use the form.

Enquire — fume extraction system Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED-TO-ORDER CLASS — FUME EXTRACTION SYSTEM SURVEY · CAPTURE · CONVEY · CLEAN · DISCHARGE · PROVE — CATCH IT AT THE SOURCE ENGINEERED IN NOIDA · INDIA