Roof Axial Flow Fan

Product Introduction

The blades of the DWT axial flow roof fan adopt a wide blade, large chord, space twisted and inclined blade shape, which can get the required air volume and air pressure during low-speed operation, thereby reducing the fan noise. The diameter of the impeller has 17 specifications ranging from 300mm to 2400mm. The air volume of the series is 1500-220000m³/h, and the total pressure is 60-320Pa. For this type of fans with a size of 12 or larger, the blades can be made with adjustable angles to meet the needs of different working conditions and achieve energy saving and noise reduction.

According to the needs of different environments, this axial flow fan can be made into an explosion-proof type, which is suitable for non-corrosive places containing flammable and explosive gases, and can also be made into an anti-corrosion type fan suitable for places containing corrosive gases. To meet the needs of performance adjustment, the axial flow fan can be equipped with a two-speed motor to realize two-speed regulation, or with a frequency conversion motor and a frequency conversion controller to realize stepless speed regulation. It is recommended that the adjustment frequency be locked at 25Hz-50Hz. This axial flow fan can be equipped with manual or electric control dampers, self-vertical shutters according to user needs. The operating temperature of the DWT axial flow roof fan is -20~+40℃; the humidity is no more than 9 (Note: It is recommended to confirm the unit of humidity, which may be 90% as commonly used in practice).

Product Details

Product Features

Roof axial fans are specialized ventilation systems designed for rooftop installations, offering efficient airflow with distinct technical features tailored for outdoor environments. Here’s a comprehensive breakdown of their key characteristics:

• High Airflow with Low Pressure Performance

Roof axial fans excel in moving large volumes of air at relatively low static pressures, making them ideal for general ventilation needs. For example, models like Greenheck’s AS series deliver airflow ranging from 641 to 1,444 CFM at pressures up to 0.5 inches of water gauge (wg) . Infinair’s YFRTX series extends this further, with capacities reaching 152,000 m³/h (89,412 CFM) and pressures up to 700 Pa (2.81 in. wg) . This makes them suitable for applications like factory exhaust, warehouse cooling, and smoke extraction in commercial buildings.

• Aerodynamic Design for Quiet Operation

Many roof axial fans incorporate advanced blade profiles optimized using computational fluid dynamics (CFD) to reduce turbulence and noise. Infinair’s three-dimensional curved impellers, for instance, undergo rigorous airflow simulation to ensure smooth air movement, achieving noise levels as low as 11.4 sones in some models . Greenheck’s aluminum propellers are engineered for quiet performance, with sound ratings decreasing to 11.4 sones at maximum airflow . The integration of vibration isolators and direct-drive mechanisms (eliminating belts) further minimizes operational noise and maintenance .

• Weather-Resistant Construction

Built to withstand harsh outdoor conditions, these fans feature robust materials and protective designs:

Corrosion Resistance: Galvanized steel, aluminum alloy, or fiberglass-reinforced plastic (FRP) housings resist rust and UV degradation. For example, Soler Palau’s models are hot-dip galvanized to EN 1461 standards, ensuring durability in corrosive environments .

Waterproofing: IP54/IP55-rated enclosures (Ingress Protection) shield motors from dust and water ingress, while rain caps or downward discharge designs (e.g., Greenheck’s hooded models) prevent water infiltration during operation .

Wind Resistance: Streamlined cowls and reinforced structures, like Infinair’s slope-panel design, reduce wind load and snow accumulation, making them suitable for high-wind regions .

• Energy Efficiency and Variable Control

Modern roof axial fans prioritize energy savings through:

High-Efficiency Motors: IE3-rated motors (from 0.75 kW) and EC (electronically commutated) drives optimize energy consumption. For example, Vent-Axia’s Sabre®      series achieves a 15% efficiency improvement over previous models .

Speed Controllability: Variable frequency drives (VFDs) allow airflow adjustment based on demand, with some models supporting up to 30% turndown. This flexibility is critical for energy-intensive applications like smoke extraction systems .

Dual-Speed Operation: Two-speed motors enable switching between low and high airflow modes, balancing performance and energy use .

• Durable and Low-Maintenance Design

Direct-Drive Mechanism: Eliminates belts and pulleys, reducing wear and tear. Infinair’s direct-drive fans, for instance, feature lubrication-free bearings for maintenance-free operation .

Easy Access: Removable motor covers (e.g., Greenheck’s aluminum motor covers) simplify inspections and repairs, while modular components allow quick replacement of worn parts .

Longevity: Dynamic balancing (G2.5 ISO standard) ensures smooth operation and extends bearing life, even in continuous-duty applications .

• Safety and Compliance

Overload Protection: Thermal cutouts and auto-reset overload switches safeguard motors from overheating .

Safety Guards: Perforated grilles or bird screens (standard on many models) prevent debris or wildlife from entering the airstream .

Certifications: UL/CUL 705 listings, AMCA air/sound performance certifications, and EN 12101-3 compliance (for smoke control) ensure adherence to international safety and performance standards . Explosion-proof variants (ATEX-certified) are available for hazardous environments .

• Versatile Applications

Roof axial fans serve diverse industries:

Industrial: Ventilating factories, warehouses, and chemical plants.

Commercial: Cooling offices, hospitals, and educational facilities.

Emergency Systems: Smoke extraction in fire scenarios (e.g., Soler Palau’s models compliant with EN 12101-3) .

Hazardous Areas: Explosion-proof variants for environments with flammable gases or dust .

• Installation Flexibility

Curb-Mounted Design: Prepunched mounting holes and standardized curbs (e.g., 22x22-inch bases) simplify installation on flat or sloped roofs .

Space-Saving: Compact footprints allow integration into tight spaces without complex ductwork, reducing installation costs .

• Specialized Features

Dual-Purpose Functionality: Some models (e.g., Soler Palau’s HHTG-V series) combine normal ventilation with emergency smoke extraction, eliminating the need for separate systems .

Customization: Options like variable blade pitch, corrosion-resistant coatings, and custom colors (e.g., BS 00A05 standard) cater to specific project requirements .

Packing & Shipping

Shunda holds a reliable packing principle to use stuffings, plastic films, cartons and the like for merchandise packing. These packing materials maintain products from humidity, vibration, extrusion, crash and corrosion. Shunda's factory has special room and professional forklifts for loading and discharging to guarantee the security of the products and staff. Regarding the products with motors are usually packed with pliastic films first to protect the motors from humidity and dust. The external package materials will be used according to the distance and ways of shipment.  Plywood cases and cartons are adopted for export shipping and long-distant delivery.

Company Profile

Shunda Air Conditioning Equipment Group Co., Ltd. (Shunda for short), founded in 2005 and based in Luquantun Industrial Park, stands as a renowned manufacturer in China.Covering over 70,000 square meters areas, Shunda has 230 people and specializes in HVAC systems and solutions.  Shunda's products have more than 70 types including modular air conditioners, fan coil units, ventilation louvers, industrial fans, fire dampers and ductworks.

Boasting ISO9001, ISO14001, ISO18001 certifications and numerous national awards, Shunda has erected a strong reputation under its "Jinxin Shunda" brand. It has provided services successfully for landmark projects in China and abroad including Africa, Southeast and some other countries of the world. The company keeps committing to the philosophy of innovation, quality and service.

Our Service 

Requirement communication and technical consultation

• Shunda's professional engineers can answer customers' questions about our technique and products.

• Provide customers with documents including product catalogs, operation instructions, technical manuals, performance parameter tables and installation drawings to ensure that our customers have well understanding of the products.

•  Work out the optimal plans for our customers according to their specific needs and applied working conditions to ensure smooth performances.

Product display and demonstration

• Invite our customers to visit our manufacutring worshops to show them the features and advantages of the products.

• Use VR to provide customers with online product display enabling them to have all round understanding of our comany and products.

• Provide customers with relative data of the product from Shunda's laboratories or real projects so that customers can understand the actual performance of the products. 

Installation and commissioning guidance and technical support

• Provide customers with installation brochure including installation instructions,  foundation construction requirements and installation tools to ensure the customer's operators can understand and operate correctly.

• On-line installation guidance can be provided and the technicians and engineers from Shunda can also be assigned for on-site guidance if necessary.

Quality assurance and maintenance

• We provide all time services including technical support and spare parts to guarantee the best performance and reliability.

• An all-day round after-sales service hotline is established to answer customers' callings for repair at any time.

Periodic follow-up visits and maintenance services

• In the quality guarantee period, customers will be visited every three months. After the quality guarantee period, an online followup visit will be arranged once a year to collect their suggestions in time so as to improve our products and services.

• Formulate customized maintenance schedules for our customers according to working time, products usage and working environment.

Technical training

• Invite our customers regularly to join in on-line trainings.

• Set up a technical consultation email box and an online customer service programs to answer customers' questions of our products. For technical questions raised by customers, responses will be given within 24 hrs.

FAQ

Q: Are you a ventilation manufacturer or a distributor?

A: We are a leading ventilation manufacturer in China with a manufacturing zone of over 70,000 m². We can produce the main units of central air-conditioners and accessories, such as fireproof ductworks, various dampers, fan coil units, air vents, air blowers and etc. These years we have been commiting to overseas market and our products have been sold all over the world.

Q: Can you accept customization projects and orders?

A: Of course, we have experienced engineers who can make optimal design and solutions on customers' requiments.