Inquiry (采购产品): Dual Action Guillotine The application is Intake air to a large industrial fan. I would like to be able to divert source air manually (on occasion) from one branch to another. Duct size is 36" dia. Action required: One lift opens one branch as it closes the other. **** Hidden Message ***** Dennis Caravella 07036 USA Company: Jacobs Engineering Phone: 908-523-5165 E-mail: dennis.caravella@conocophillips.com **** Hidden Message ***** dennis.caravella@conocophillips.com