We have combination sashes in one building on campus. Typically, the sash frame is in the lowest position and the horizontal sliding sashes are pushed as far to either side as possible. The frame design makes it difficult for users to pry the sliding windows out of the track or they would do it.
Don't believe what your architects say about energy savings, either. They'll undersize the air handlers, assuming energy savings from a reduced hood face area. They will be long gone when your building doesn't work right because users don't use the sashes as intended. See above.
Our campus has standardized on vertical rising sashes and a lowered work surface for accommodation. How a lowered work surface height accommodates a person who might be very tall, I'm unsure.
Ralph's points are spot-on. For me, a vertical rising sash, with a good stop at 18", prevents people from diving head-first into the fume hood as they'll bonk their head on the sash. It's the simple things that bring me joy ...
Debbie M. Decker, CCHO, ACS Fellow
Chair, Division of Chemical Health and Safety
University of California, Davis
Birkett's hypothesis: "Any chemical reaction
that proceeds smoothly under normal conditions,
can proceed violently in the presence of an idiot."
From: DCHAS-L Discussion List [mailto:dchas-l**At_Symbol_Here**MED.CORNELL.EDU] On Behalf Of Wolff, Marie
Sent: Wednesday, August 05, 2015 12:10 PM
Subject: Re: [DCHAS-L] Fume Hoods
I have a different fume hood question. We are in the design stage of one new chemistry lab at a subcampus. Architects are telling us that hoods with a combination sash (that can work horizontally or vertically) are available and would be better for students who need accommodations. Does anyone have experience with this kind of fume hood? What are the advantages/disadvantages of the combination sash fume hood?
Dr Marie Wolff
Physical Science Coordinator
Natural Science Department
Joliet Junior College
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