The below diagrams represent air patterns based on the type of fume hood from a constant bypass to a restricted bypass.

The hoods above represent restricted bypass hoods, these hoods do not have louvers in the front panel or an airfoil. When ordering your fume hoods specify which type you would prefer.

The above fume hoods represent the constant bypass type system with louvered front panel and an airfoil. This system allows the air to freely flow through the hood even when the sash is closed. There are many advantages to this type of system the biggest being your fume hood interior will clean out faster if your system is functioning properly. This can be used on all Labcase fume hoods, if you have questions consult with us to answer your questions.