Roof Axial 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 achieve the required air volume and air pressure during low-speed operation, thereby reducing the fan noise. The fan impeller diameter has 17 specifications ranging from 300mm to 2400mm. The air volume of the series fan is 1500-220000m³/h and the total pressure is 60-320Pa. For 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, the 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 performance adjustment needs of different operating points, the 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 fixed to 25Hz-50Hz. The fan can be equipped with manual or electric control valves, self-vertical shutters, etc. according to user needs. The operating temperature of the DWT axial flow roof fan is -20~+40℃; the humidity is less 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 ventilating systems designed for rooftop installations, offering efficient airflow with distinct technical features tailored for outdoor environments. Here’s a comprehensive breakdown of their key features:

• High Airflow with Low Pressure Performance

Roof axial fans have 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 enables 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 cut down 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 hard outdoor conditions, these fans feature robust materials and protective designs:

Corrosion Resistance: Aluminum alloy, Galvanized steel 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 shield motors from dust and water ingress, while rain caps or downward discharge designs prevent water infiltration during operation .

Wind Resistance: Streamlined cowls and reinforced structures, such as Infinair’s slope-panel design, cut down 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 air-flow adjustment based on requirement, 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 energy use .

• Durable and Low-Maintenance Design

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

Easy Access: Removable motor case (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) guarantees smooth operation and extends bearing life, even in continuous-duty applications .

• Safety and Compliance

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

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

Packing & Shipping

Shunda takes a reliable packing principle to use plastic films, stuffings, cartons and the like for merchandise packing. These substances maintain products from humidity, vibration, extrusion and crash. Our manufacturing zone has special room and 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 dust and humidity. The external packing materials will be used according to the shipping  distance and ways.  Plywood cases and cartons are good to use 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 ducts.

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

Our Service 

Requirement communication and technical consultation

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

• Provide customers with documents including product catalogs, operation instructions, technical manuals, performance parameter tables and installation drawings to ensure that customers fully understand the products.

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

Product display and demonstration

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

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

• Provide customers with relative data of the product performance tests conducted by Shunda in 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 a list of installation tools to ensure the customer's installers can accurately understand and operate.

• On-line installation guidance can be provided and the technical engineer can also be assigned for on-site guidance if necessary.

Quality assurance and maintenance

• We provide long-term 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' repair calls 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 conducted once a year to collect their suggestions in time so as to improve our products and services.

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

Technical training

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

• Set up a technical consultation email box and an online customer service platform 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 HVAC manufacturer or a distributor?

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

Q: Can you accept customization orders and projects?

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