It does not matter if the hood has horizontal or vertical sash
or if it has no sash at all, because the required air flow is a function of the interior volume of the hood which remains constant.
11 Euston Place, Leamington - installation on the front elevation of replacement timber windows in top floor, and two white vertical sash
plastic windows on the second floor (retrospective)
A horizontal or vertical sash
will control airflow through the front opening and can be positioned to offer the best chemical containment.
Air Sentry purpose, volume HBASC radioisotope, acid-resistant, * Variable air or custom volume hood with HEPA, ULPA, or * High Perfor- charcoal filters mance, Low velocity Company/Product Materials Used Sash Type Hood Face Name Velocity Kewaunee Phenolic resin Vertical sash
370 to 675 Scientific FPM Instruments Supreme Air High Performance/ LV05T543460-00 NuAire Inc.
The response involved new, state-of-the-art, 2-m chemical fume hoods, which feature a combination of a horizontal and vertical sash
as well as sash-opening limits.
The interior extended trailing edge of this handle kicks back any contaminated air located behind the sash so it does not "wash down" close to the operator during use of the vertical sash