"Over Under" the only other use I could envision for this is the protection provided below an obstruction, such as duct work. "Over" being the ceiling/roof or deck elevation system, and the "Under" being the below the obstruction sprinklers added because of the obstruction to the distribution of the "over" sprinklers.
Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
