speaker-Richard-RobertsThis is the first in a series of podcasts that covers the new 520 Hz low frequency requirements in several NFPA Standards and why it’s most effective for waking people who are hard of hearing, school age children and the elderly.

Life Safety Systems Guides and Manuals Fire Detection, Alerting and Signaling

Play

Leave a Reply

Your email address will not be published. Required fields are marked *

*