The Volume Control Damper is designed for airflow regulation and isolation in marine, offshore, and industrial ventilation systems, suitable for high-pressure systems requiring reliable sealing, structural integrity, and operational dependability. It provides precise, reliable airflow control under both normal and emergency conditions, applicable for air, hazardous gases, and other process media.

The Pressure Relief Damper is primarily used for overpressure protection and pressure balancing in marine, offshore, and industrial ventilation systems. When internal system pressure reaches the set value, the damper opens automatically to relieve pressure; it resets automatically once pressure returns to the normal range. This product is designed to protect ductwork, compartments, and equipment from abnormal pressure surges.

The Non-Return Damper is designed to prevent backflow in marine, offshore, and industrial ventilation systems, ensuring unidirectional flow of the medium in the intended direction. It opens and closes automatically in response to system pressure differential changes, requiring no complex control systems, and is suitable for applications requiring backflow prevention, system protection, and operational reliability.

The Fire & Gas Damper is a high-integrity safety component for use in marine, offshore, and industrial HVAC systems, designed to prevent the spread of flames, smoke, and hazardous gases through ductwork. It combines excellent fire resistance, low-leakage performance, and corrosion resistance, and can be installed in fire-rated bulkheads, decks, and rectangular or circular duct systems, providing reliable isolation under both normal and emergency conditions.

Galvanized steel ducts are suitable for indoor, non-corrosive environments such as ship accommodation areas, engine-room ventilation, data centers, and new energy facility systems. Manufactured using standardized processes, they meet HVAC supply and exhaust air requirements and offer good formability and cost efficiency, making them one of the most commonly used duct types for industrial and commercial ventilation systems.

Stainless steel ducts are suitable for outdoor applications or corrosive indoor environments such as chemical plants, battery rooms, and offshore equipment spaces. With excellent corrosion resistance and airtightness, they are ideal for HVAC systems in offshore facilities, marine vessels, onshore oil & gas, the nuclear industry, data centers, and new energy installations, ensuring long-term reliable operation under harsh conditions.

To mitigate the high-decibel noise generated during LNG carrier operations, Firsquare supplies dedicated exhaust silencers (DN50-DN150) specifically engineered for harsh cryogenic, corrosive, and explosion-proof marine environments. Integrating advanced acoustic technology and low-temperature resistant designs, these silencers efficiently attenuate noise from natural gas, BOG, and nitrogen emissions down to industry standards. While adapting to limited shipboard spaces and ensuring unobstructed exhaust flow, they provide a highly reliable, compliant, and low-noise acoustic solution for the safe operation of LNG carriers.

The Olive Vent Cowl for LNG Vessels is a critical ventilation and protection device installed on exposed decks, cargo tanks and vent systems of ships. It is mainly used together with vent silencers, relief lines and pressure-vacuum valves. While ensuring normal ventilation and air exchange for compartments and pipelines, it effectively prevents intrusion of rain, wind, seawater, insects and foreign matters. With excellent salt-spray resistance, low-temperature toughness and robust structure, it fully meets marine standards and the strict requirements of LNG carriers for cryogenic, explosion-proof and high-corrosion protection service.