I don't think the UL "classification" (aka listing lite) puts a restriction on velocity. I think 15 fps is just a standard velocity they use in their pressure loss test. I may be wrong.
J. Scott Mitchell, P.E. --- On Tue, 12/22/09, Thom McMahon <[email protected]> wrote: From: Thom McMahon <[email protected]> Subject: RE: Retro Backflow To: [email protected] Date: Tuesday, December 22, 2009, 5:52 PM The issue with flowing more than required is not an issue as long as you don't exceed the velocity of the listing on the device. _______________________________________________ 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)
