Opposed Blade Volume Dampers For Fume Hood Face Velocity Control

Open Blade Volume Dampers for Fume Hood Face Velocity Control

Fume hoods play a crucial role in laboratories to protect personnel and the environment from hazardous chemicals and fumes. The face velocity of a fume hood is an essential parameter that ensures proper containment of the contaminants within the hood. To control the face velocity effectively, opposed blade volume dampers are used in fume hood systems. These dampers offer precise control over the airflow, allowing the operator to adjust the face velocity as needed. In this article, we will delve into the details of opposed blade volume dampers and their significance in fume hood face velocity control.

The Basics of Fume Hood Face Velocity Control

Fume hood face velocity is the speed at which air is drawn into the fume hood opening. It is measured in feet per minute (fpm) and is a critical factor in determining the containment effectiveness of the fume hood. The recommended face velocity for a fume hood depends on the type of operation being performed and the chemicals involved. Proper face velocity ensures that the contaminants are contained within the hood and do not escape into the laboratory environment.

To maintain the face velocity within the desired range, fume hood systems are equipped with dampers that control the airflow. Opposed blade volume dampers are commonly used for this purpose due to their ability to provide precise and smooth airflow control. These dampers consist of blades that move in opposite directions to regulate the airflow effectively. By adjusting the angle of the blades, the operator can increase or decrease the airflow through the fume hood, thereby controlling the face velocity.

Benefits of Using Opposed Blade Volume Dampers

Opposed blade volume dampers offer several advantages over other types of dampers when it comes to fume hood face velocity control. One of the main benefits is their ability to provide accurate and consistent airflow adjustment. The opposed blade design allows for fine-tuning of the airflow, ensuring that the face velocity remains within the desired range at all times. This level of control is essential in maintaining the containment efficiency of the fume hood and protecting laboratory personnel from exposure to hazardous substances.

Another advantage of opposed blade volume dampers is their durability and reliability. These dampers are constructed from high-quality materials that can withstand the harsh conditions in laboratory environments. They are designed to provide long-term performance without requiring frequent maintenance or replacement. This reliability ensures that the fume hood system operates efficiently and effectively over an extended period, reducing downtime and maintenance costs.

Opposed blade volume dampers also offer a high degree of flexibility in airflow control. The blades can be adjusted individually or in unison to achieve the desired airflow rate. This flexibility allows for precise control over the face velocity, making it easier to adapt to changing operational requirements. Whether a higher face velocity is needed for more hazardous experiments or a lower face velocity for general lab work, opposed blade volume dampers can accommodate these variations with ease.

Additionally, opposed blade volume dampers are designed for easy installation and integration into existing fume hood systems. They can be retrofitted into older hood models or included in new installations without significant modifications. This versatility makes them an ideal choice for labs looking to upgrade their fume hood systems for improved face velocity control. The straightforward installation process also minimizes downtime during upgrades, ensuring that the lab can resume operations quickly.

Considerations for Selecting Opposed Blade Volume Dampers

When choosing opposed blade volume dampers for fume hood face velocity control, several factors should be taken into account to ensure optimal performance and compatibility with the existing system. One of the key considerations is the size of the damper relative to the fume hood opening. The damper should be appropriately sized to provide sufficient airflow control without causing excessive turbulence or pressure drop. It is essential to select a damper that can accommodate the airflow requirements of the fume hood while maintaining a uniform airflow distribution across the hood opening.

Another important consideration is the material of construction of the opposed blade volume dampers. The dampers should be made from materials that are resistant to corrosion, chemical exposure, and high temperatures. Stainless steel and aluminum are commonly used for fume hood dampers due to their durability and compatibility with lab environments. The material chosen should be able to withstand the harsh conditions inside the fume hood and provide long-lasting performance without degradation.

The design of the opposed blade volume dampers is another critical factor to consider when selecting a damper for fume hood face velocity control. The damper should be designed to provide smooth and precise airflow adjustment without causing fluctuations in face velocity. The blade mechanism should operate smoothly and be able to maintain the desired position without drifting or sticking. A well-designed damper will ensure that the face velocity remains constant and within the specified range, enhancing the containment efficiency of the fume hood.

Installation and Maintenance of Opposed Blade Volume Dampers

Proper installation and maintenance of opposed blade volume dampers are essential to ensure the effective operation of fume hood systems. The dampers should be installed by qualified technicians following the manufacturer's guidelines to ensure correct positioning and alignment. Care should be taken to seal any gaps around the damper to prevent air leakage and maintain the integrity of the containment system.

Regular maintenance of opposed blade volume dampers is necessary to prevent issues such as blade wear, corrosion, or malfunction. The dampers should be inspected periodically for any signs of damage or wear, and any worn components should be replaced promptly. Lubrication of the blade mechanism should be performed as needed to ensure smooth operation and prevent sticking or binding. Proper maintenance will prolong the life of the dampers and ensure consistent airflow control for the fume hood system.

Conclusion

Opposed blade volume dampers play a vital role in fume hood face velocity control, allowing for precise adjustment of airflow to maintain the desired face velocity. These dampers offer several advantages, including accurate airflow control, durability, flexibility, and ease of installation. When selecting opposed blade volume dampers for fume hood systems, considerations such as size, material of construction, and design should be taken into account to ensure optimal performance and compatibility with the existing system. Proper installation and maintenance of the dampers are essential to ensure efficient operation and long-term reliability of the fume hood system. By utilizing opposed blade volume dampers effectively, labs can enhance the containment efficiency of their fume hoods and provide a safe working environment for laboratory personnel.