Avoid these four common fume hood mistakes

Fume hoods are very effective safety devices when used correctly. However, no matter how well a hood is designed, it won’t be effective unless proper safety measures are taken.

1.

Raising the sash too high

A fume hood sash works as a blast shield to provide protection in the event of a fire. Sashes are designed to “spiderweb” instead of shatter, keeping users safe from glass & chemicals.

REMEMBER:

When using a fume hood, the sash should always be in front of the user’s face. The standard sash height is 18 inches or less from the work surface. The lower the sash, the more safety it will provide. When the fume hood is not in use, the sash should be shut.

2.

Not maintaining a safe distance from the fume hood

In the event of an explosion or fire, users in close proximity to the hood have the highest risk of injury. Therefore, only those using the hood should be near the face.

MINIMIZE TRAFFIC NEAR THE OPENING

WHEN THE HOOD IS IN USE,

When a hood is installed, make sure it isn’t in a location where personnel have to pass in front of it. Avoid making fast movements when taking items in and out of the hood. This will disrupt the airflow, allowing contaminants to leave the hood. When working inside the hood, users should ensure that chemicals are kept at least six inches back from the face. If they're placed closer, vapors won’t be captured efficiently.

3.

Blocking airflow in the hood

Obstructions in the fume hood will lower its effectiveness by prohibiting adequate airflow across the work surface and increasing turbulence.

DON'T OBSTRUCT THE AIRFLOW

Remember:

Place equipment toward the sides of the hood to reduce obstruction of the exhaust slots. Objects placed near return ducts and baffles will interfere with air being pulled from the back of the hood. It’s also important that the airflow isn’t obstructed from underneath. If it's blocked, the hood won’t function properly. Place large equipment on perforated or slotted shelving to elevate it above the work surface.

4.

Storing chemicals in the hood

It’s okay to have chemicals inside the fume hood when it is in use, but fume hoods are not designed to store chemicals for long periods of time.

DON'T STORE ITEMS IN THE HOOD

Remember:

Items kept in the hood can interfere with the airflow, which can cause contaminants to spill into the room. The airflow of a fume hood is much higher than needed for the storage of closed containers. Therefore, storing materials in the hood is an expensive misuse of equipment.

Proper hood use will ensure the safety of you & those around you. Take proper measures & avoid these common mistakes.

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