What rules should be followed to properly use a fume hood?
Safe Fume Hood Work Practices
- Conduct all work and keep all apparatus at least 6 inches back from the face of the hood.
- Keep the hood sash closed as much as possible.
- Keep the hood slots and baffles free of obstruction by apparatus or containers.
- Do not permanently store apparatus or chemicals in the hood.
Which of the following are considered best practices in the use of a lab fume hood?
Good Work Practices
- Conduct all work and keep all apparatus at least 6 inches back from the face of the hood.
- Keep the hood sash closed as much as possible.
- Keep the hood slots and baffles free of obstruction by apparatus or containers.
- Do not permanently store chemicals or apparatus in the hood.
How do you know if your fume hood is working properly?
Process:
- Turn on hood.
- Check the vaneometer.
- Match red arrow on sash with red arrow on the side panel of the hood.
- To acquire reading hold vaneometer in the center of the hood.
- Acceptable standard -Chemical fume hoods should operate at a face velocity of (80-120) Linear Feet Per Minute.
What should you do before using a fume hood?
Before Using A Fume Hood. Familiarize yourself with the chemicals. When working with hazardous material, you should make sure you know the potential safety hazards. Read the Safety Data Sheet (SDS) and follow the safety precautions.
Should all lab procedures be conducted under a fume hood?
All operations that may generate hazardous air contaminants must be done inside a laboratory fume hood. Fume hoods do not prevent accidents or chemical splashes. Safety glasses (goggles), lab coats, and appropriate chemical gloves must be worn when working in, on, or around the fume hood.
What is the proper procedure when heating materials in lab?
1) Turn off heat sources when they are not in use. 2) Point test tubes away from yourself and others when heating substances in them. 3) Use the proper procedures when lighting a Bunsen burner. 4) To avoid burns, do not handle heated glassware or materials directly.
How does a lab fume hood work?
A fume hood is a ventilated enclosure in which gases, vapors and fumes are contained. An exhaust fan situated on the top of the laboratory building pulls air and airborne contaminants through connected ductwork and exhausts them to the atmosphere. The slots and baffles direct the air being exhausted.
When working in a fume hood What is the best position of the hood sash?
Work with the fume hood sash in the lowest possible position no higher than 18 inches. Keep the sash clean and clear. The sash will act as a physical barrier in the event of an accident inside the fume hood.
What can disrupt the airflow of the fume hood?
The following are common situations that can arise in laboratories that may negatively affect fume hood performance:
- Objects obstructing the return ducts and baffle areas.
- Objects and equipment too close to the front of the fume hood.
- Secondary currents created by portable fans and traffic in front of the hood.
What is the primary function of a fume hood sash?
The sash works as a blast shield to provide protection and containment in the event of a fire. In the case of an explosion, sashes are designed to “spiderweb” instead of shattering, keeping those in the area safe from glass and chemicals.
How often should a fume hood be inspected?
Types of fume hoods Standard flow fume hoods are designed to operate at 100 linear feet per minute (LFM) at 18 inches sash height. (Note that some legacy hoods were designed to operate at 100 LFM at full sash height, as high as 25 inches). Low flow fume hoods are designed to operate at 70 LFM at 18 inches sash height.
How do you turn on a fume hood?
To improve how well fumes are taken up and away, put your reactions or equipment as far back in the fume hood as you possibly can. Turn the unit’s light on by using the switch near the electrical outlets on the outside panel. The safety shield or glass sash of the hood automatically drops to the right height for proper operation.
Is it safe to use a laboratory fume hood?
All operations that may generate hazardous air contaminants must be done inside a laboratory fume hood. Fume hoods do not prevent accidents or chemical splashes. Hood users must be trained in the proper operation and use of laboratory fume hoods. The hood should not be operated unless it is verified that it is working correctly.
Can a bench top fume hood be used?
Be extra careful with certain materials, such as paper products, chemical wipes and aluminum foil. Lightweight materials such as these can easily get sucked into the exhaust, impeding airflow. If using a bench top fume hood, utilize the sliding sash barrier.
When to lower the sash on a fume hood?
Don’t lift the sash above this height unless it’s to put materials in or take them out of the hood. You should also keep the shield between the inside of the hood and your body. Lower the sash only if the height of the automatic stop is too high to protect your body and face.