DDL single suction low-noise centrifugal fan

1、 Characteristics:
① Environmental ProtectionNo need for electricity, efficient and energy-saving continuous operation, no noise, no sparks, and explosion-proof.
② Weather resistant characteristicsCircular arc-shaped blades, with gaps between each blade. When rotating, the blades complement each other to fill these gaps. A large amount of rainwater flows along the circular nodes
The line is thrown out, and a small amount of rainwater flows along the leaves and blades onto the roof, without flowing into the turbine. At the same time, the rotating turbine allows air to flow out through the gaps between the blades, blocking rainwater from entering.
③ Operating deviceAdopting high-tech ball bearings, this type of bearing is enclosed and always self-lubricating, allowing it to withstand gentle winds below 3.2Km/h
Rotate.
④ Dust preventionThe turbine exhaust fan runs continuously for 24 hours, making it difficult for dust to adhere, and even if cleaning is required, it is very convenient.
⑤ Maintenance costThe rotary exhaust fan does not require maintenance or replacement of parts, providing excellent quality. Therefore, choosing a motorless turbine fan is a choice for investors
Guarantee.
⑥ Lightweight and lightweightThe turbine exhaust is installed on the roof and the base together, with a total weight of about 15Kg per seat, which is quite lightweight. When designing the steel structure load, it can be ignored.
⑦ DaylightingThere is a gap between the blades that allows light to enter the room, which can increase illumination by 5-10% and save electricity costs.
⑧ LifespanThe general service life is over 15 years.

2、 Application
① Generate air convection and exhaust heat dissipation.
② Reduce indoor temperature and increase indoor fresh space.
③ Reduce air conditioning load and increase cooling efficiency.
④ Extract moisture, mold, and steam from the roof to keep it dry.
⑤ Replace heavy-duty electric exhaust fans, reduce bracket costs, save electricity bills, and reduce noise.
⑥ Suitable for ventilation and air exchange in factories, warehouses, rooftops of buildings, villas, courtyards, flower houses, livestock breeding, mining tunnels, and all roofs.

Note: 1. The average annual wind speed is generally 3.4m/s (third level wind), and the indoor and outdoor temperature difference is 5 ℃. If the indoor and outdoor temperature difference is greater than 5 ℃, the installation quantity can be appropriately increased
2. Buildings with a height of less than 6 meters have better performance when used.

4、 Installation diagram for roof

1. Installation diagram of DWT-I-II-III roof fan



2. Installation diagram of DWT-IV (no motor) roof turbine exhaust fan

In order to achieve the efficiency of the turbine, the installation location must be at a high point on the roof, avoiding installation behind protective walls or in places where the wind may be blocked by nearby high-rise buildings or trees.

Installation guide for turbine exhaust fan:
1. The ideal position for the exhaust fan should be as close to the ridge line as possible, and the inclined edge of the bottom plate should be embedded in the gap under the metal cover plate of the ridge during installation.
2. Use the bottom plate inner hole as a template to outline the opening, and use a cutting machine to complete the cutting of the roof panel opening.
3. Embed the bottom plate and fix it to the roof panel with at least 10 self tapping screws. Cut the downward sloping edge of the bottom plate into a waveform folding gap with the same cross-section as the roof panel.
4. Install the base, measure the upper end of the base horizontally, and then fix the base and bottom plate with self tapping screws.
5. Insert the exhaust fan into the base end and fix it with self tapping screws.
6. Use glass glue to fix the self nail and joint seam * to complete the installation.
Note:
1. The center to center distance of each exhaust fan shall not be less than 3M.
2. Avoid installing exhaust fans in turbulent areas and outside low roofs adjacent to vertical walls. Other exhaust fans should be installed in hot areas to meet special requirements.

Note: The inner diameter of 14 inches is Φ 300, and the outer diameter is Φ 460; The inner diameter of 20 "is Φ 500 and the outer diameter is Φ 620. The inner diameter of 27" is Φ 600/680 and the outer diameter is Φ 840/880.

a、 Turbine exhaust fan
b、 The upper edge of the steel plate must be inserted into the cover plate of the spine
c、 After the flat steel plate is formed, it must be larger than the area of the installation hole
d、 The two sides of the steel plate are folded downwards at a right angle, and the wave peaks of the roof panel must be covered
e、 seat adjustment
f、 mounting hole

Example of Ventilation Calculation