English version machine-translated from the Vietnamese original — under review.
The torsion-spring fusible-link EI fire damper is a protected NSCA invention (Application No.: 02-2022-03968SC). Its design combines a torsion spring with a push arm that locks the damper blade, plus a pointer that indicates the open/closed status of the damper. In particular, the blade can be opened from the outside, making use, maintenance, repair and periodic inspection easier – a problem faced by the tension-spring fusible-link dampers currently on the market.
The drive mechanisms, springs and mechanical components were tested located entirely inside the furnace, proving the damper's ability to operate at high temperature and meeting the most stringent test criteria.
The product is the result of research and innovation by the NSCA engineering team. The successful EI90 test ensures the ability to supply the fire damper market with a highly effective damper type, suitable for most building classes as required by QCVN 06:2021/BXD
