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March 2006

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dehoyos, Ramon
Date:
Wed, 8 Mar 2006 08:36:01 -0500
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        Hi Tony:
        Positive Air pressure is maintained by the AC make up air.
Usually, 10 to 20% of the air in the building should be from outside
air, so the AC intake forces air from outside and created positive
pressure in the building. Yes internal doors can be kept open, but
outside doors should be kept closed. One way to check if there is
positive air pressure is to stand by a cracked outside door and feel
breeze of air going out. Positive air pressure prevents fumes from
accumulating to dangerous levels. If the AC is not hooked up that way, a
blower should be installed on an outside wall to bring outside air in
and do the same thing.
        Regards,
        Ramon




-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Tuesday, March 07, 2006 4:34 PM
To: [log in to unmask]
Subject: Re: [TN] Positive Pressure

Hi Tony,

I can't answer your question about controls to maintain positive
pressure, but I can point out to you that this is not a REQUIREMENT of
J-STD-001.  It is a RECOMMENDATION.  The key word in the spec is
"should": "3.6.1 Environmental Controls The soldering facility should be
enclosed, temperature and humidity controlled,and maintained at a
positive pressure."

Only the word "Shall" makes a binding requirement.  See section 1.4:
"1.4 Definition of Requirements. The word shall is used throughout this
document whenever a requirement is intended to express a provision that
is binding."

I went through this same thing for a customer audit to J-STD-001.  Our
facility had AC, but the humidity was not 100% controlled, and we did
not maintain positive pressure.  They insisted the facility had to meet
all the items listed in 3.6.1, but that is not the case.

I would say that if your investigation yields it would take significant
investment to bring your facility in compliance with section 3.6.1, then
you at least have a leg to stand on in stating it is not required per
the specification.

Good luck,
Kevin





-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tony Gasso
Sent: Tuesday, March 07, 2006 3:56 PM
To: [log in to unmask]
Subject: [TN] Positive Pressure

Recently a customer has requested we comply to paragraph 3.6.1 to
maintain positive presure in our facility during soldering operations,
for terminals, wire preping, limited radial components and PCBA's per
J-STD-001C

We have an open assemlby area of about 10,000 Sq. Ft., lowered 12' drop
ceilings, and AC but internal doors remain open to both the fabrication
area as well as to the parking lots outside. Other than placing chart
recorders to monitor pressure, temp. and himidity, does anyone else have
similar problems with maintaining environmental controls in your
facility and have you had any positive results with your controls?

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