A. Collapsible gates
B. Rolling shutters
C. Ventilators and glazing
D. All the above
Correct Answer: All the above ✔
Last Updated: January 20, 2019
A. Collapsible gates
B. Rolling shutters
C. Ventilators and glazing
D. All the above
Correct Answer: All the above ✔
Last Updated: January 20, 2019