Hoods shall have transparent movable sashes constructed of shatter-resistant, flame-resistant material that is compatible with the materials and processes to be used in the hood, and capable of being moved to close the entire front face.
Vertical-rising sashes are preferred. Multiple sashes may be installed within the same track.
Sashes may offer extra protection to lab workers since they can be positioned to act as a shield.Sashes may offer extra protection to lab workers since they can be positioned to act as a shield.
ANSI Z9.5 3.1.1
A force of five pounds shall be sufficient to move vertically and/or horizontally moving doors and sashes.
Sticky sashes and doors are not moved, so they become useless. These specifications result from decades of experience.
AIHA Z9.5 3.1.1
Automatic sash closers with proximity sensors may be considered to allow for energy savings when the hood is not in operation. Note that a user’s training program may be more effective in achieving this desirable end.