An Introduction To Fume Cupboards
James Cox
Project Manager
Estimated reading time: 5 minutes
Introduction
Overview
A fume cupboard, also known as a fume hood or exhaust hood, is a type of ventilation system commonly used in laboratories and other workspaces to control and extract harmful fumes, vapours, and dust generated by hazardous substances.
In this article, we will explore the different types of fume cupboards, how they work, their components and features as well as their applications and benefits. We will also discuss the importance of proper installation, maintenance and precautions to take when working with fume cupboards and LEV systems.
What is a fume cupboard?
Fume cupboards are essential for laboratory workers to stay safe while handling hazardous materials. They provide a critical layer of protection against harmful chemicals, as they ensure that the fumes generated during experiments are effectively contained and exhausted. Without them, workers are at risk of inhaling toxic substances.
Types Available
Ducted
The most common type. Connected to an external extraction system that exhausts fumes outside the building.
Ductless
Uses filters to purify air before recirculating it. Ideal where ducting is difficult or make-up air is insufficient.
Benchtop
Compact units designed to sit on a laboratory bench. Available in both ducted and ductless configurations.
Walk-In
Floor-standing units designed to accommodate large equipment that can be wheeled in/out.
Mobile
Movable units, typically ductless, ideal for schools or flexible lab spaces.
Key Components
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Sash: Adjustable protective screen between the operator and the workspace.
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Work surface: Chemical-resistant working platform.
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Baffle: Panel ensuring even air distribution.
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Alarm: Alerts users if extraction is insufficient (e.g., TEL AFA4000/2).
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Services: Water, gases, drainage, and lighting integration.
How does a fume cupboard work?
Explanation of the extraction system
The extraction system of a fume cupboard works by drawing air from the workspace into the enclosure and directing it through a duct or stack to the outside of the building. This process creates negative pressure within the enclosure, which prevents fumes from escaping into the laboratory.
Role of extract fans
Extraction fans play a crucial role in fume cupboards, as they draw air through the fume cupboard and direct it outside. Properly sized and maintained exhaust fans ensure that fumes are effectively captured and exhausted, maintain the safety of the laboratory workers.
Fume Cupboard Installation and Maintenance
Before ordering and installing a fume cupboard, it's important to considered factors such as:
- Type and quantity of hazardous substances (Try Trespa, Polypropylene, or Epoxy)
- Laboratory size and available space
- Safety features (Firetrace, Autosash)
- Supply air (VAV fume cupboards)
Regulatory Compliance (COSHH Regulation 9)
COSHH Regulation 9 requires maintenance and servicing of Local Exhaust Ventilation (LEV) equipment, including fume cupboards, to be undertaken at least every 14 months.
Regular maintenance ensures your equipment operates safely and effectively, protecting your team and your facility.
Need Help Choosing?
Our experts can help you select the right fume cupboard solution for your specific laboratory requirements.