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Date: Thu, 30 Sep 2010 14:39:41 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Janet Baum <baum.janet**At_Symbol_Here**GMAIL.COM>
Subject: Re: Need fume hood/fire alarm help
In-Reply-To: <OF08013DFB.C3A69F7E-ON852577AE.004142FA-852577AE.00417AF3**At_Symbol_Here**notes.cc.sunysb.edu>
Dear Ken, That's good news. If it were a chronic condition, it would lead
to surprising results as I mentioned.
Janet
On Thu, Sep 30, 2010 at 6:55 AM, Kim Auletta
wrote:
> Thanks, everyone for your suggestions. I will pass them all on to the
> consultant & building staff.
>
> Just to restate - the imbalance & inability to open the doors is not duri
ng
> our normal operations, but when the fire alarm is activated & the supply
is
> shut down. We do have sufficient make up air in the building for our
> day-to-day work.
>
> Kim Auletta
> Lab Safety Specialist
> EH&S Z=6200
> Stony Brook University
> kauletta**At_Symbol_Here**notes.cc.sunysb.edu
> 631-632-3032
> EH&S Web site: http://www.stonybrook.edu/ehs/lab/
>
> Remember to wash your hands!
>
>
> From: scrooks**At_Symbol_Here**PPEPPRO.COM To:
> DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
> Date: 09/29/2010 08:39 PM Subject: Re: [DCHAS-L] Need fume hood/fire alar
m
> help Sent by: DCHAS-L Discussion List
> ------------------------------
>
>
>
> Kim,
>
> Life safety has to trump the standards you mention. I can speak directly
> to ANSI Z9.5 and that upcoming revision (which was written with an
> expectation that NFPA 45 is also addressing your situation in their next
> revision.)
>
> Z9.5 may not provide absolute clarity nor the answer that you're looking
> for but it does attempt to fix the unintended earlier recipe for egress
> issues. And although the update/publication is being held up while we
> address a seprate public objection, the section addressing your question
> will read as follows:
>
> Within Section 5.2.3 Laboratory Ventilation - Emergency Modes
>
> *Left-hand column "shall" text*
>
> *FIRE - Any manual or automatic means of detecting fire (such as a pull
> station or smoke detector) in a laboratory room shall also activate an
> appropriate fire emergency mode of operation for the room and/or building
> ventilation system.
> The selected fire emergency mode shall operate all supply and exhaust
> equipment in the room in a manner that promotes egress, retards the sprea
d
> of fire and smoke, and complies with applicable fire safety codes and
> standards.*
>
> *Right-hand column "explanatory or should" text*
>
> *The intent of the fire emergency ventilation mode is to promote safe
> egress. This means apply negative pressurization in the room of fire ori
gin
> in order to retard the spread of smoke and toxic fire gases to other part
s
> of the facility but do not pressurize to the extent that the force needed
to
> open the door is excessive. (Also refer to the current versions of NFPA 9
2A
> and NFPA 45.)*
> * *
> *The common practice of cutting off supply air to a fire zone does not
> apply to some laboratories. The combination of a high exhaust rate and n
o
> supply can depressurize a room so far that some occupants would be unable
to
> open the doors. The initial design of the laboratory ventilation system
> must include analysis of flow rates, pressure levels and forces on the do
or
> to ensure that egress is possible.*
>
> Regards,
>
>
> Steve Crooks, MS, CIH, CSP
> Chair, AIHA/ANSI Z9.5-2xxxx
>
>
> -------- Original Message --------
> Subject: [DCHAS-L] Need fume hood/fire alarm help
> From: Kim Auletta <*kauletta**At_Symbol_Here**NOTES.CC.SUNYSB.EDU*
> >
> Date: Wed, September 29, 2010 1:42 pm
> To: *DCHAS-L**At_Symbol_Here**LIST.UVM.EDU*
>
> We have recently renovated 2 floors of our 7 story Chemistry building. Th
is
> job included adding MANY more fume hoods than were already in the buildin
g.
> The NFPA/ANSI/common sense code requires that the fume hoods stay & the
> supply air/HVAC system shuts off when the fire alarm is activated. Of
> course, this now makes the building so negative that they can't easily op
en
> the doors at the bottom of the stairwell/emergency exit and all the doors
> quickly slam shut. The consultant is at a loss of what to do to fix this.
>
> How have your large buildings with numerous hoods dealt with this problem
?
> Have you found a door mechanism that allows a person to overcome the seve
re
> negative imbalance and safely exit? Any advice or examples are greatly
> appreciated.
>
> NFPA 45, Sect. 8.10.4 Fire detection and alarm systems shall not be
> interlocked to automatically shut down chemical fume hood exhaust fans.
> 8.10.5 Proper door operation for egress shall be maintained when the supp
ly
> system shuts down and the lab exhaust system operates, creating a pressur
e
> differential.
>
> Thanks!
>
> Kim Auletta
> Lab Safety Specialist
> EH&S Z=6200
> Stony Brook University*
> **kauletta**At_Symbol_Here**notes.cc.sunysb.edu*
> 631-632-3032
> EH&S Web site: *http://www.stonybrook.edu/ehs/lab/*
>
> Remember to wash your hands!
>
>
Dear Ken, That's good news. =A0If it were a chronic condition, it would
lead to surprising results as I mentioned.
Janet
On Thu, Sep 30, 2010 at 6:55 AM, Kim Auletta
<kauletta**At_Symbol_Here**notes.cc.suny
sb.edu> wrote:
Thanks
, everyone for your suggestions.
I will pass them all on to the consultant & building staff.
Just to restate - the imbalance &a
mp;
inability to open the doors is not during our normal operations, but when
the fire alarm is activated & the supply is shut down. We do have suffi
cient
make up air in the building for our day-to-day work.
| From:
| scrooks**At_Symbol_Here**PPEPPRO.COM
|
| To:
| |
| Date:
| 09/29/2010 08:39 PM
|
| Subject:
| Re: [DCHAS-L] Need fume hood/
fire alarm
help
|
| Sent by:
| DCHAS-L Discussion List <<
a href="mailto:DCHAS-L**At_Symbol_Here**LIST.UVM.EDU" target="_blank">DCHAS-L**At_Symbol_Here**LIST.UVM.E
DU> |
Kim,
=A0
Life safety has to trump the standard
s
you mention. =A0I can speak directly to ANSI Z9.5 and that upcoming
revision (which was written with an expectation that NFPA 45 is also addres
sing
your situation in their next revision.)
=A0
Z9.5 may not provide absolute clarity
nor
the answer that you're looking for but it does attempt to fix the unint
ended
earlier recipe for egress issues. =A0And although the update/publication
is being held up while we address a seprate public objection, the section
addressing your question will read as follows:
=A0
Within Section 5.2.3 Laboratory Venti
lation
- Emergency Modes
=A0
Left-hand column "shall"
text
=A0
FIRE - Any manual or aut
omatic
means of detecting fire (such as a pull station or smoke detector) in a
laboratory room shall also activate an appropriate fire emergency mode
of operation for the room and/or building ventilation system.
The selected fire emergency mode shall operate all supply and exhaust equip
ment
in the room in a manner that promotes egress, retards the spread of fire
and smoke, and complies with applicable fire safety codes and standards.
=A0
Right-hand column "explanator
y
or should" text
=A0
The intent of the fire eme
rgency
ventilation mode is to promote safe egress. =A0This means apply negative
pressurization in the room of fire origin in order to retard the spread
of smoke and toxic fire gases to other parts of the facility but do not
pressurize to the extent that the force needed to open the door is excessiv
e.
(Also refer to the current versions of NFPA 92A and NFPA 45.)
=A0
The common practice of cut
ting
off supply air to a fire zone does not apply to some laboratories. =A0The
combination of a high exhaust rate and no supply can depressurize a room
so far that some occupants would be unable to open the doors. =A0The
initial design of the laboratory ventilation system must include analysis
of flow rates, pressure levels and forces on the door to ensure that egress
is possible.
=A0
Regards,
Steve Crooks, MS, CIH, CSP
Chair, AIHA/ANSI Z9.5-2xxxx
=A0
=A0
-------- Original Message --------
Subject: [DCHAS-L] Need fume hood/fire alarm help
From: Kim Auletta <kau
letta**At_Symbol_Here**NOTES.CC.SUNYSB.EDU&
gt;
Date: Wed, September 29, 2010 1:42 pm
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
We have recently renovated 2 floors of our 7 story Chemistry building.
This job included adding MANY more fume hoods than were already in the
building. The NFPA/ANSI/common sense code requires that the fume hoods
stay & the supply air/HVAC system shuts off when the fire alarm is
activated. Of course, this now makes the building so negative that they
can't easily open the doors at the bottom of the stairwell/emergency ex
it
and all the doors quickly slam shut. The consultant is at a loss of what
to do to fix this.
How have your large buildings with numerous hoods dealt with this problem?
Have you found a door mechanism that allows a person to overcome the severe
negative imbalance and safely exit? Any advice or examples are greatly
appreciated.
NFPA 45, Sect. 8.10.4 Fire detection and alarm systems shall not be interlo
cked
to automatically shut down chemical fume hood exhaust fans.
8.10.5 Proper door operation for egress shall be maintained when the supply
system shuts down and the lab exhaust system operates, creating a pressure
differential.
Thanks!
Kim Auletta
Lab Safety Specialist
EH&S =A0 =A0Z=6200
Stony Brook University
kauletta**At_Symbol_Here**notes.cc.
sunysb.edu
631-632-3032
EH&S Web site: http
://www.stonybrook.edu/ehs/lab/
Remember to wash your hands!
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