Laboratory chemical hood
One of the essential equipment in medical, industrial, and research laboratories is the laboratory chemical hood, which is used to ensure the health and safety of laboratory technicians and staff.
A chemical hood serves as the primary protection for personnel and the laboratory environment when working with hazardous chemicals.
As a general rule, chemical hoods should be used when handling substances that are significantly volatile or classified as highly hazardous, particularly those that primarily enter the body through inhalation.
With an appropriate ventilation system, a chemical hood effectively removes harmful gases, acids, alkalis, and unpleasant odors from the user’s workspace. One of its key advantages is the controlled airflow system, which prevents excessive loss of conditioned laboratory air. This feature helps address common laboratory issues such as overcooling in winter and overheating in summer.
Applications of Laboratory Chemical Hoods
- Protecting laboratory staff and technicians from exposure to toxic and hazardous fumes by either venting them outside the laboratory or absorbing chemical vapors through carbon filters.
Importance of Laboratory Chemical Hoods
- Preventing inhalation of toxic and harmful fumes
- Reducing the risk of fire, explosions, and chemical burns
- Ensuring proper ventilation in the workplace and laboratory
Types of Laboratory Chemical Hoods
Cabinet-Type Chemical Hood
This is the primary and most common type of laboratory chemical hood, designed to extract harmful gases, vapors, acids, alkalis, and unpleasant odors from the workspace. It includes essential accessories such as a sink, water and gas valves, and lighting, with a built-in cabinet underneath for optimal space utilization.
Canopy Hood
This hood is installed above chemical processes, effectively venting vapors generated during chemical reactions to the outside.
Articulated Arm Hood
Equipped with a jointed arm, this hood allows for mobility within a specified range, making it adaptable for various laboratory setups.
Features of Laboratory Chemical Hoods
- Airflow velocity: 0.4 to 0.6 meters per second
- Suction capacity: Varies based on laboratory space and hood dimensions, utilizing a centrifugal fan with an adjustable speed of 1400 to 2800 RPM
Types of Chemical Hoods Based on Exhaust System
Ducted (Ventilation-Based) Chemical Hood
- Lacks a filter, with vapors directly vented outside via ducts.
- Not suitable for biohazardous materials and not recommended for high-risk laboratory work.
Ductless (Filter-Based) Chemical Hood
- Uses carbon filters to absorb and purify vapors before releasing clean air.
- Not designed for handling biohazardous or microbiological materials.
👉 Ducted models are the most commonly used in laboratories.
Construction Materials of Laboratory Chemical Hoods
- MDF Body: Suitable for educational centers, but not resistant to acids or corrosive chemicals.
- MDF with Formica Coating: Offers some resistance to acids.
- PVC Body: Resistant to acids and water.
- Steel Body with Electrostatic Coating: Highly resistant to acids and water, with a fire-resistant and acid-resistant work surface.
Standard Dimensions of Chemical Hoods
| Material Type | Height | Width | Length |
|---|---|---|---|
| MDF, PVC, MDF with Formica | 190 cm | 70 cm | 100 cm |
| MDF, PVC, MDF with Formica | 220 cm | 80 cm | 121 cm |
| Steel with Electrostatic Coating | 220 cm | 80 cm | 124 cm |
👉 Steel models are manufactured using CNC technology and come in fixed dimensions.
Key Considerations When Purchasing a Laboratory Chemical Hood
✅ Choose a hood that fits your laboratory space.
✅ Select the appropriate hood type based on the chemicals being used.
✅ Assess the installation site and required facilities (e.g., exhaust ducts, water and gas connections, drainage).
✅ Consider the hood’s construction material and dimensions based on the chemicals in use.
✅ Check the fan’s suction power.
✅ For canopy and articulated hoods, review the arm diameter, ceiling type, and material.
✅ Ensure adequate lighting.
✅ Evaluate the number and type of switches and outlets required.
✅ Chemical hoods do not require installation—only follow the provided setup instructions.
✅ Perform regular maintenance on all hood components.
✅ Never use explosive materials under the hood.
✅ Contact the manufacturer for repairs—do not attempt modifications.
Azotech: Your Trusted Partner in Laboratory Equipment
Golsan Shimi Pars and Azotech Industrial Manufacturing proudly offer high-quality laboratory chemical hoods with reliable warranty and after-sales service. Our team is committed to providing fast and professional support to our valued customers.