My understanding is the it should not be less than 70 degrees and pref.erably vertical 

 

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Chair, ICASE Committee on Safety in Science Education
International Council for Associations of Science Educationwww.icaseonline.net

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In a message dated 12/14/2011 3:36:53 P.M. Eastern Standard Time, ldmclouth**At_Symbol_Here**LBL.GOV writes:

Hi All -

Is anyone aware of a prohibition against using 45 degree angle ductwork
runs (as opposed to vertical runs) for a perchloric acid fume hood? 
This pertains to water washdown systems.  This question was posed to me
and I thought I'd seek your collective wisdom.
aware of regarding this subject.

Regards

Larry