Products
Contact us
Phone: +86-534-5012407
Mobile phone: +86-188-6602-0062
Email: sddljnhb@163.com
Website: http://www.sddljnhb.com
Address: No. 5166, Tianqu East Road, Economic Development Zone, Dezhou City, Shandong Province
Our company’s stainless steel duct‑type axial fans are versatile industrial ventilation units featuring a cylindrical direct‑drive design, with airflow moving axially along the fan shaft. They are widely used in applications such as factory ventilation and air exchange, ducted air supply, kitchen smoke extraction, exhaust gas treatment, and environmental cooling.
Our company manufactures duct‑mounted mixed‑flow fans—also known as cross‑flow fans—which are ventilation devices that fall between axial and centrifugal fans. The airflow passes through the impeller at an inclined angle, combining the high airflow volume of axial fans with the high static pressure of centrifugal fans. These fans are widely used in ducted air supply, fire‑smoke extraction, fresh‑air ventilation, and industrial ventilation applications.
Single-layer louvered air diffuser
Our company’s single‑layer louver diffusers are the most fundamental terminal air‑supply and exhaust devices in ventilation and air‑conditioning systems. They are typically installed at the ends of supply, return, or fresh‑air ductwork to evenly distribute airflow and adjust the direction of supply air, and are widely used in indoor HVAC and ventilation systems for shopping malls, office buildings, hotels, residential complexes, and other types of structures.
Our company’s swirl diffuser is a specialized air‑handling terminal unit designed for high‑ceiling spaces and large temperature differentials. Its key feature is adjustable guide vanes that induce rotational motion in the supply airflow, generating a high‑velocity swirling jet. This design delivers long throw distances and a high induction ratio, enabling rapid mixing with indoor air and ensuring uniform air distribution in large spaces. It is widely used in airport terminals, sports arenas, large industrial facilities, shopping mall atriums, and other similar applications.
Our company’s square diffusers are among the most common ceiling‑mounted air supply outlets in central air-conditioning and fresh‑air systems. Featuring a multi‑layered, square conical diffusion design, they deliver airflow that spreads evenly in all directions, creating an attached jet that rapidly mixes with indoor air. This ensures uniform, comfortable air distribution and makes them widely used in indoor HVAC systems for shopping malls, office buildings, hotels, hospitals, and other types of facilities.
Our company’s door‑hinged return air diffusers are terminal units for return and exhaust air in central air-conditioning and ventilation systems, installed in suspended ceilings or on walls. Their key feature is a hinged panel that opens and closes like a door, facilitating easy removal and cleaning of the internal filter. These diffusers are widely used in indoor return‑air systems in shopping malls, office buildings, hotels, hospitals, and other types of commercial and public facilities.
Our company’s smoke‑exhaust fire dampers are primarily installed in supply and exhaust ductwork or smoke‑exhaust ducts of ventilation and air-conditioning systems. Under normal conditions, they remain open; in the event of a fire, they automatically close when the temperature of the flue gases in the duct reaches a preset threshold. They meet specified requirements for fire resistance and integrity over a defined period, thereby preventing the spread of smoke and flame. These dampers are indispensable safety devices in building fire‑protection systems.
The company manufactures curved diffusers—also known as arc‑shaped or custom‑profile diffusers—which are specialized ventilation terminals tailored to architectural forms. Breaking away from the conventional straight‑line design, these diffusers can be custom‑fabricated to match ceiling or wall contours such as arcs, broken lines, or circles, seamlessly integrating into the overall interior aesthetic while fulfilling air‑supply, return, or exhaust functions. They are widely used in high‑end settings that demand sophisticated aesthetics, including hotel lobbies, shopping‑mall atriums, theaters, and exhibition halls.
Positive-pressure air supply outlet
Our company manufactures positive-pressure supply air outlets—also known as multi‑blade pressurization supply air outlets or fire‑compartment supply air outlets—which are specialized devices installed in building smoke control and exhaust systems, typically in stairwell anterooms, shared anterooms, and fire‑elevator lobbies. Normally closed, these outlets are opened upon activation of the fire‑alarm linkage system during a fire to deliver fresh air into the stairwell or anteroom, creating positive pressure that prevents smoke from entering evacuation routes and ensures the safe evacuation of occupants.
Our company manufactures duct‑type mixed‑flow fans—also known as diagonal‑flow fans—which are high‑efficiency ventilation devices positioned between axial and centrifugal fans. The airflow passes through the impeller at an inclined angle, combining the large air volume of axial fans with the high static pressure of centrifugal fans. These fans are widely used in applications such as building smoke extraction, fresh‑air ventilation, and industrial ductwork supply.
Our company manufactures panel-type smoke vents—also known as remotely controlled smoke vents or smoke dampers—which are specialized devices installed in suspended ceilings or wall surfaces within building fire‑protection smoke‑exhaust systems. Normally closed, these vents are opened upon activation by the fire‑alarm linkage system during a fire to exhaust indoor smoke, thereby facilitating safe evacuation and supporting firefighting and rescue operations. They are widely used in shopping malls, office buildings, underground parking garages, industrial plants, and other facilities.
Our company manufactures manual airflow control valves—also known as manual dampers or airflow regulators—which serve as critical components in ventilation and air-conditioning systems for regulating duct airflow and balancing flow among branch lines. By manually adjusting the vane angle to alter the effective cross-sectional area of the duct, these valves enable airflow regulation, duct on/off control, and system balancing, and are widely used in building fresh-air and exhaust systems, air-conditioning networks, and industrial ventilation ductwork.
Electric Square Airflow Control Valve
Our company manufactures electric airflow control valves—also known as electric dampers or electric regulating valves—which serve as core components in ventilation and air-conditioning systems for automated duct‑airflow regulation. Powered by an electric actuator that rotates the damper blades, these valves enable automatic airflow adjustment, duct opening and closing, and system balancing, and are widely used in building fresh‑air and exhaust systems, air-conditioning networks, fire‑protection systems, and industrial ventilation ducts.
Fully Automatic Smoke Exhaust Fire Damper
Our company’s fully automatic smoke‑exhaust fire damper is a core component of building smoke control and exhaust systems, integrating smoke extraction, fire protection, and automatic control in a single unit. Normally closed, it automatically opens during a fire to vent smoke and, when the temperature of the flue gas reaches 280°C, it closes automatically to prevent the spread of flames. This fully automatic fire‑protection valve combines smoke‑exhaust functionality with fire‑separation capabilities and is widely used in smoke‑exhaust ductwork for shopping malls, office buildings, underground parking garages, industrial plants, and other facilities.
Our company manufactures stainless steel round dampers—specialized airflow control valves designed for circular ductwork. These dampers are widely used in ventilation and air-conditioning systems, exhaust-gas treatment, chemical processing, food and pharmaceutical industries, and other applications involving circular ducts, enabling precise airflow regulation, duct opening and closing, and system balancing. With their outstanding corrosion resistance, hygienic properties, and high-temperature tolerance, they are the preferred choice for demanding operating conditions characterized by humidity, corrosivity, or stringent hygiene requirements.
Our company manufactures wall‑mounted axial fans—also known as wall‑type axial fans or wall‑mounted exhaust fans—which are axial ventilation units designed for direct installation on exterior walls or masonry. They come equipped with a rain‑proof elbow, louvers, and a protective grille, eliminating the need for additional ductwork and enabling direct exhaust to the outdoors. These fans are widely used for ventilation and air exchange in factories, warehouses, basements, equipment rooms, and other similar spaces.
This Product is a non-powered turbine-type rooftop natural ventilator (commonly known as a stainless steel wind ball / non-powered vent cap). It relies on the dual driving forces of natural wind and thermal convection caused by indoor-outdoor temperature differences to rotate the turbine. By leveraging the centrifugal negative-pressure effect, it continuously extracts high-temperature exhaust gases, moisture, and odorous gases from workshops and buildings, all without electricity, zero energy consumption, and no operational noise.
Our company’s jet fans (tunnel jet fans) are a specialized type of axial-flow fan, primarily used in longitudinal ventilation systems for highways, railways, subway tunnels, and similar underground structures. They are currently among the most widely deployed pieces of equipment in tunnel ventilation.
Our company manufactures belt-driven industrial centrifugal fans, which are core equipment in medium- and low-pressure ventilation, dust removal, and exhaust gas treatment systems. These fans rely on the rotation of a centrifugal impeller to generate centrifugal force, enabling air conveyance, and are widely used in industrial plant ventilation, dust collection and purification, boiler draft, material handling, and exhaust gas treatment applications.
This stainless steel centrifugal fan is a corrosion‑resistant centrifugal ventilation unit. The entire housing is fabricated from stainless steel sheet, and it generates airflow pressure through the high‑speed rotation of a centrifugal impeller, enabling gas conveyance and exhaust ventilation. Unlike conventional carbon‑steel fans, it offers superior resistance to corrosion, acids and alkalis, rust, and high temperatures, making it suitable for handling corrosive exhaust gases, high‑temperature steam, and clean air. It can be equipped with either explosion‑proof or standard national‑standard motors, features adjustable airflow and static pressure, operates smoothly with minimal vibration, and is widely used in environmental protection exhaust systems, as well as in chemical, food processing, and coating industries—where corrosion resistance is required—for ventilation, dust removal, exhaust gas extraction, and material conveying applications.
The louver‑type ventilation fan (wall‑mounted louver exhaust fan) is a square, axial‑flow ventilation device featuring an ABS flame‑retardant plastic housing and an automatic opening‑and‑closing louver mechanism. When powered on, the louvers automatically open to exhaust air; when power is off, they close under gravity, effectively preventing outdoor insects, rain, and cold drafts from entering. By rotating its axial‑flow impeller, the fan creates negative pressure, swiftly removing moisture, odors, cooking fumes, and stale air. It offers quiet operation, energy efficiency, dust and rain protection, easy installation, and automatic wind‑blocking functionality. Available in a 220V single‑phase household version and a high‑power industrial model, it is widely used for ventilation in kitchens, bathrooms, small shops, warehouses, and other spaces.
Window-mounted ventilation fan
Window‑style ventilation fan (square window exhaust fan), specially designed for installation in glass windows and square wall openings. It is an axial‑flow, direct‑exhaust ventilation device featuring an integrated ABS flame‑retardant plastic construction with a circular front air guide and a square outer frame. When powered on, the fan blades rotate to expel stale, polluted air. A built‑in spring‑loaded, self‑opening wind‑deflecting louver ensures that the louvers automatically open upon startup and close when the unit stops, effectively preventing insects, rain, and drafts from entering. The entire unit is equipped with a fully enclosed, moisture‑proof motor, offering quiet operation, energy efficiency, and easy installation—simply fit it into a pre‑drilled window opening or a pre‑cut square recess in the wall. Ideal for kitchens, bathrooms, small apartments, and retail spaces where basic ventilation is needed, it quickly removes humidity, odors, cooking fumes, and stuffy air.
Our company manufactures differential pressure relief valves—also known as pressure‑relief valves or automatic differential pressure regulators—which are specialized devices installed in building smoke control and exhaust systems at locations such as stairwell anterooms, shared anterooms, and fire‑elevator lobbies. When the pressurization system is operating and the pressure within the anteroom exceeds the set threshold, the valve automatically opens to vent excess pressure, maintaining the indoor pressure within a safe range. This prevents excessively high pressures from impeding the proper opening of fire doors and ensures the safe evacuation of occupants.
Our company manufactures spherical diffusers—also known as spherical nozzles—which are specialized air‑handling terminal units designed for high‑ceiling spaces and long‑distance airflow. Their key feature is a built-in, rotatable spherical nozzle that allows the airflow direction to be adjusted freely within a specified angular range. With extended throw distances and substantial airflow volumes, these diffusers enable targeted air distribution in large areas, making them ideal for applications such as airport terminals, sports arenas, large industrial facilities, and railway stations.
Mobile phone:+86-188-6602-0062
Email:sddljnhb@163.com
Website:http://www.sddljnhb.com
Address: No. 5166, Tianqu East Road, Economic Development Zone, Dezhou City, Shandong Province
Mobile Access