A Reminder to Shut the Sash
Several years ago we began a Shut the Sash program due to the fact that we were finding fume hood sashes being routinely left open when not in use. We still find fume hoods with open sashes when not in use. So, this is a reminder that there are many reasons to shut the sash.
When the sash is closed it acts as a barrier between you and the materials that may be in the hood. The sash is made of tempered glass and can offer added protection from shattered glass, chemical spills, and vapors which will remain contained in the hood if the sash is closed when an “accidental event” occurs.
In case of a power outage or hood ventilation failure, chemical vapors will not back up into the
laboratory. If there is an accidental or emergency
shutdown of the fume hood ventilation system a
closed sash will help contain vapors in the hood.
Never open a fume hood if the ventilation system
is not operational.
Most fume hoods at IUPUI operate
on a "variable air volume" system, which
means the volume of air exhausted is reduced as
the sash height is lowered. It is estimated
that each four foot fume hood with its sash open all
of the time costs over $3500 per year to operate.
This cost accounts for the heating and cooling to
condition the air removed by the hood as well as the
fan energy to move the air. If
half the fume hoods on campus are left open the total
cost of wasted energy quickly jumps to over one million
dollars per year. This figure would actually be
even higher given the fact that the energy costs will
be greater for larger hoods, which are common.
Even if we could insure that all sashes are closed for
12 hours per day, the savings to the University on
wasted energy could be in the millions of dollars.
Please remember to
“Shut the Sash”. Shutting the sash is a simple habit
to develop that will result in safer labs, reduce our
carbon footprint, save money and may save jobs.