NEWS

Selecting Proper Ventilation Control Dampers

Tunnel ventilation systems are classified in serveral different ways. Since today's automotive and mass transit tunnels differ in requirements, choosing... ... Read More.

Operations and Maintenance Guide

NFPA80, 72, 105 and 92 standards spell out the requirements for periodic operation and testing of life safety dampers. This Operations and Maintenance... ... Read More.

UL Test Standard Changes: What Do They Mean to You? (Updated!)

ALL NEW UL555 (Fire Damper) and UL555S (Smoke Damper) Test Standards begin JULY 1, 2002! What do they mean to you? ... Read More.