What materials are Exhaust Fume Hoods made of?

Exhaust fume hoods are essential equipment in laboratories, industrial settings, and other environments where the safe removal of hazardous fumes, vapors, and particulate matter is required. As a trusted exhaust fume hood supplier, I understand the importance of using high - quality materials to ensure the effectiveness, durability, and safety of these critical devices. In this blog, I will explore the various materials commonly used in the construction of exhaust fume hoods.

1. Outer Shell Materials

The outer shell of an exhaust fume hood provides structural support and protection for the internal components. One of the most popular materials for the outer shell is steel. Steel is known for its strength and durability. It can withstand physical impacts, resist corrosion when properly coated, and support the weight of the hood and its internal parts. Stainless steel, in particular, is a top choice. It contains chromium, which forms a passive oxide layer on the surface, protecting the steel from rust and corrosion. This makes it suitable for use in harsh chemical environments where exposure to corrosive substances is common.

Aluminum is another material used for the outer shell. It is lightweight, which can make the fume hood easier to install and move if necessary. Aluminum also has good corrosion resistance, especially when anodized. Anodizing is an electrochemical process that creates a protective oxide layer on the aluminum surface, increasing its durability and resistance to wear and tear.

Fiberglass - reinforced plastic (FRP) is also an option for the outer shell. FRP is a composite material made of a plastic matrix reinforced with fine glass fibers. It is highly resistant to corrosion, making it ideal for use in laboratories where strong acids and alkalis are handled. Additionally, FRP is relatively lightweight and can be molded into complex shapes, allowing for more customized designs of fume hoods.

2. Inner Liner Materials

The inner liner of the exhaust fume hood is in direct contact with the hazardous substances being ventilated. Therefore, it needs to be highly resistant to chemical corrosion. Polypropylene is a commonly used liner material. It has excellent chemical resistance to a wide range of acids, bases, and organic solvents. Polypropylene is also lightweight, easy to clean, and relatively inexpensive. It can be fabricated into smooth surfaces, which helps prevent the accumulation of chemicals and makes the liner easier to maintain.

Stainless steel is also used as an inner liner material, especially in fume hoods where high - temperature applications or more robust construction is required. Stainless steel can withstand high temperatures and is resistant to many chemicals. However, it may not be as resistant to certain aggressive chemicals as polypropylene in some cases.

Epoxy - coated steel is another option. The epoxy coating provides an additional layer of protection against chemical corrosion. Epoxy is a thermosetting polymer that forms a hard, durable coating on the steel surface. It can be formulated to have different levels of chemical resistance depending on the specific requirements of the fume hood.

3. Sash Materials

The sash is the movable window on the front of the fume hood that allows users to access the interior while maintaining a barrier between the hazardous substances and the laboratory environment. Safety glass is the most common material for sashes. Tempered safety glass is strong and shatter - resistant. In the event of breakage, it breaks into small, relatively harmless pieces instead of sharp shards, reducing the risk of injury to laboratory personnel.

Polycarbonate is also used for sashes. Polycarbonate is a lightweight and impact - resistant plastic. It has excellent optical clarity, allowing for good visibility into the fume hood. Polycarbonate is also more resistant to impact than glass, which can be an advantage in high - traffic laboratories or areas where there is a risk of accidental collisions.

4. Ductwork Materials

The ductwork is responsible for transporting the hazardous fumes from the fume hood to the outside environment. Galvanized steel is a common material for ductwork. Galvanized steel is coated with a layer of zinc, which provides corrosion resistance. It is strong and can be fabricated into various shapes and sizes to fit the specific ventilation requirements of the fume hood system.

Aluminum ductwork is also used, especially in applications where weight is a concern. Aluminum is lightweight and has good corrosion resistance. It is also relatively easy to install and can be connected using various methods, such as flanges or slip joints.

Fiberglass ductwork is an option for applications where high - temperature or corrosive fumes are present. Fiberglass is resistant to heat and many chemicals. It can be lined with a smooth interior surface to reduce friction and improve the airflow efficiency of the duct system.

5. Exhaust Fan Materials

The exhaust fan is a crucial component of the fume hood system, as it creates the necessary airflow to remove the hazardous fumes. The housing of the exhaust fan is often made of steel or aluminum. Steel provides strength and durability, while aluminum is lightweight and corrosion - resistant.

The fan blades can be made of various materials, depending on the application. Plastic fan blades are common in low - cost or general - purpose fume hoods. They are lightweight and resistant to corrosion. However, for applications where high - temperature or high - speed operation is required, metal fan blades, such as stainless steel or aluminum, may be used. Metal blades can withstand higher stresses and are more suitable for heavy - duty applications. You can learn more about Fume Hood Exhaust Fan.

6. Work Surface Materials

The work surface of the fume hood is where experiments and operations are carried out. Chemical - resistant laminate is a popular choice. It is a thin layer of plastic material that is bonded to a substrate, usually particleboard or plywood. Chemical - resistant laminate is available in a variety of colors and patterns, and it is relatively inexpensive. It has good resistance to many common laboratory chemicals and is easy to clean.

Stainless steel work surfaces are also used, especially in fume hoods where high - temperature applications or more robust construction is required. Stainless steel is durable, easy to clean, and can withstand high temperatures. However, it may be more expensive than chemical - resistant laminate.

Ceramic work surfaces are another option for fume hoods. Ceramic is highly resistant to heat, chemicals, and scratches. It provides a very smooth and non - porous surface, which is easy to clean and maintain. However, ceramic work surfaces are relatively expensive and may be more brittle than other materials.

Conclusion

In conclusion, the materials used in the construction of exhaust fume hoods play a crucial role in their performance, durability, and safety. Different materials are selected based on the specific requirements of the application, such as the type of chemicals being handled, the temperature range, and the budget. As a supplier of exhaust fume hoods, I am committed to using the highest - quality materials to ensure that our products meet the strictest safety and performance standards.

If you are in the market for an exhaust fume hood, whether it is a Fume Chamber in Chemistry Laboratory or a Fume Hood Cabinet, we can provide you with a wide range of options to meet your needs. Our team of experts can help you select the right materials and design the perfect fume hood for your specific application. Contact us today to start the procurement and negotiation process, and let us help you create a safe and efficient working environment.

References

• Perry, R. H., & Green, D. W. (1997). Perry's Chemical Engineers' Handbook. McGraw - Hill.
• American National Standards Institute (ANSI). (2016). ANSI/AIHA Z9.5 - 2016 Laboratory Ventilation.
• International Building Code (IBC). (2018). International Code Council.