Hi RL, While it's only been a short while our operator has been using it for two days straight and likes it a lot. No signs yet of saturation of the cartridges and he is having no trouble breathing. Like I said yesterday the vent is overhead and draws the fresh air in from behind the operator. About all that's going into the tubes is fresh air from the shop. I'll let you know if this attitude changes. Best regards, KennyB -----Original Message----- From: legg [mailto:[log in to unmask]] Sent: Thursday, June 19, 2008 6:34 AM To: [log in to unmask]; Ken Bloomquist Subject: Re: respirator cartridge for IPA Breathing through a schnorkel is not made easier by doubling the number of tubes. This looks like a misapplication of hardware by the vendor. Suggest you try it yourself first, before applying it. I find it hard to believe that IPA vapour concentration is significantly reduced behind the operator's back. RL --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 -----------------------------------------------------