I didn't know avian flue influenced the electronics industry :-) Brian John Burke wrote: > The height above the roof is very important. Too high and it will be an > aircraft hazard, too low and the pile of deceased pigeons on the roof > may eventually block the exhaust flow............8-) > > Happy Friday TechNetters... > > John > > John Burke > Senior Manager - Operations , Optichron > [log in to unmask] > W: 510 249 5233 > M: 408 515 4992 > http://www.optichron.com > Profile: https://www.linkedin.com/e/fps/2665502/ > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon > Sent: Friday, February 17, 2006 9:01 AM > To: [log in to unmask] > Subject: Re: [TN] Zero Emissions Spray Booth > > Hi Doug: > What you mean is negative pressure. Air should pulled > from the end of the exhaust tube instead of pushed from the bottom. If > it is pushed, ( blower is over the hood ) the tube leaks will exhaust > fumes into the building which is bad. If it is pulled (blower on the > roof ) the tube leaks dilute the fumes more, which is good. By > regulations the velocity at exits has to be some many feet per second, > depending on the area and the end of the tube has to be some many feet > above the roof, to avoid fumes from accumulating on the roof. > Regards, > Ramon > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls > Sent: Thursday, February 16, 2006 11:01 AM > To: [log in to unmask] > Subject: Re: [TN] Zero Emissions Spray Booth > > Amol, > In my opinion, "Zero Emissions" exists only in the minds of regulators > and salesmen. What they are talking about is a positive air flow spray > booth that sucks all VOCs into one air stream. That air stream becomes > subsequently filtered, usually through a charcoal medium, such that any > exhaust from the filter contains no VOCs or other regulated emissions. > If your spray booth exhaust is not filtered, even if properly permitted, > then it has emissions. > > Doug Pauls > Rockwell Collins > > > > > "Kane, Amol > (349)" > <akane@HARVARDGRP > To > .COM> [log in to unmask] > Sent by: TechNet > cc > <[log in to unmask]> > > Subject > [TN] Zero Emissions Spray Booth > 02/16/2006 08:11 > AM > > > Please respond to > TechNet E-Mail > Forum > <[log in to unmask]> > ; Please respond > to > "Kane, Amol > (349)" > <akane@HARVARDGRP > .COM> > > > > > > > Dear TechNetters, > A question was recently asked by a customer whether we have a "Zero > Emissions Spray Booth" for conformal coating applications. We spray > polyurethane, acrylic, epoxy and silicon coatings. We have an exhaust > type spray booth to remove harmful vapors from the coating room. Can > anyone shed some light on the Zero Emissions Spray Booth concept so that > I can evaluate our existing infrastructure against the requirements and > make upgrades if necessary. > > Thanks in advance, > > Amol Kane > M.S (Industrial Eng.) > Process Engineer > Harvard Custom Manufacturing > 941 Route 38 Owego, NY 13827 > Phone: (607) 687-7669 x349 > [log in to unmask] > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon > Sent: Thursday, February 16, 2006 8:33 AM > To: [log in to unmask] > Subject: Re: [TN] BGA Reflow profile - Thermocouples > > Hi Dominic: > It should not cost you much to find out what is the temperature > of a board through reflow. The investment of buying a Mole or other > similar device, that will allow you to record the profile of a board > through an oven is only "once". If you are using eutectic solder and > your coldest components sees 20 degrees over the melting point which is > 203 C and you are not exceeding the highest temp that the most > sensitive component may withstand, then you have a working profile, that > simple. > Regards, > Ramon > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Dominic Boudreau > Sent: Wednesday, February 15, 2006 5:50 PM > To: [log in to unmask] > Subject: [TN] BGA Reflow profile - Thermocouples > > Hello Techneter's, > > I am working on a procedure to make the reflow profile of a PCB. > > What are the techniques to know where to attach the thermocouples on the > "PCB"? I already know that it should be where we have the coldest and > hottest spot but is it possible to know when we "must" test a BGA to > have a better reflow profile. We are a little company so we don't have > the money to test a BGA each time we have one on a PCB. > > > > Thank you > > > > > > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e To > unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or > (re-start) delivery of Technet send e-mail to [log in to unmask]: SET > Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the > posts: send e-mail to [log in to unmask]: SET Technet Digest Search the > archives of previous posts at: http://listserv.ipc.org/archives Please > visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for > additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e To > unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or > (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing > per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: > http://listserv.ipc.org/archives Please visit IPC web site > http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] > or 847-615-7100 ext.2815 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e To > unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or > (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing > per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: > http://listserv.ipc.org/archives Please visit IPC web site > http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] > or 847-615-7100 ext.2815 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e To > unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or > (re-start) delivery of Technet send e-mail to [log in to unmask]: SET > Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the > posts: send e-mail to [log in to unmask]: SET Technet Digest Search the > archives of previous posts at: http://listserv.ipc.org/archives Please > visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for > additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text > in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: > http://listserv.ipc.org/archives > Please visit IPC web site > http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 > ext.2815 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------