What is a Disabled Refuge EVC System? An EVC System (Emergency Voice Communication System) is a fixed, monitored and maintained, bi-directional, full duplex voice communication system to assist the orderly evacuation of disabled or mobility impaired people and enhance fire fighters communication during emergencies.
The definition of stalwart is a description for someone who is loyal and strong or for something that is reliable and sturdy. An example of stalwart is a description for a loyal supporter of a cause.
obstruction - something immaterial that stands in the way and must be circumvented or surmounted; lack of imagination is an obstacle to one's advancement; the poverty of a district is an obstacle to good education; the filibuster was a major obstruction to the success of their plan.