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Description
RD31S-4DW.6Q.AL ZIEHL-ABEGG Centrifugal Fan 3~400V 3.9kW 11.0/6.4A 1300rpmZIEHL ABEGG RD31S 4DW. 6Q. AL Centrifugal Fan 3. 9kW German Made ZIEHL ABEGG RD31S 4DW. 6Q. AL Centrifugal Fan 3. 9kW 400V 1300rpm GERMAN ENGINEERING High performance industrial centrifugal fan engineered for extreme durability (>10 years), whisper quiet operation, ultra low energy consumption, and powerful high volume airflow. Perfect for heavy duty HVAC, industrial ventilation, cooling systems, and critical thermal management. Download Official
ZIEHL-ABEGG RD31S-4DW.6Q.AL Centrifugal Fan
⚡ 3.9kW | 400V | 1300rpm | GERMAN ENGINEERING
High-performance industrial centrifugal fan engineered for extreme durability (>10 years), whisper-quiet operation, ultra-low energy consumption, and powerful high-volume airflow. Perfect for heavy-duty HVAC, industrial ventilation, cooling systems, and critical thermal management.
📄 Download Official Datasheet (PDF)Core Performance Advantages
10+ Years Industrial Durability
German-engineered by ZIEHL-ABEGG with robust 41kg heavy-duty construction, premium sealed bearings, and reinforced housing. Proven to operate reliably for over a decade in the harshest industrial environments.
Ultra-Quiet Operation
Aerodynamically optimized centrifugal impeller and precision dynamic balancing deliver exceptionally low noise levels. Ideal for noise-sensitive facilities despite high power output.
Energy Saving / Low Power Draw
Efficient 3.9kW motor with only 11.0/6.4A current draw at 400V three-phase. Exceptional energy efficiency for continuous 24/7 industrial operation.
High Airflow & Superior Cooling
Optimized operation at 1300 rpm generates exceptional centrifugal airflow with high static pressure. Provides outstanding heat dissipation for large industrial equipment and heavy machinery.
Applications Across Industries
The RD31S-4DW.6Q.AL is a versatile solution for demanding ventilation and cooling challenges across global markets.
🏭Industrial Ventilation
❄️Commercial Air Conditioning
🧊Industrial Refrigeration
🔥Heating Systems
⚙️Electrical Automation
🔌Frequency Converters / VFD
🚄Rail Transportation HVAC
🏢HVAC (FFU/AHU) Systems
🌫️Air Purification
🚗New Energy Vehicles
🏗️Process Cooling
💻Data Center Cooling
⚡Power Plant Ventilation
🏥Hospital HVAC
🔬Laboratory Ventilation
📡Telecom Equipment Cooling
🔋Battery Storage Systems
🌾Agricultural Ventilation
🚢Marine & Shipboard HVAC
🏗️Cooling Towers
Technical Specifications
| Model Number |
RD31S-4DW.6Q.AL Genuine Article No: 121303 | Motor No: RZ31S-4DW.6Q.AL |
| Manufacturer | ZIEHL-ABEGG Made in Germany |
| Product Type | Centrifugal Fan High Static Pressure |
| Condition | Original new from manufacturer |
| Rated Power | 3.9 kW Heavy Duty Industrial Grade |
| Voltage | 3~400V / 50/60Hz Three Phase |
| Rated Current | 11.0 A / 6.4 A |
| Speed | 1300 rpm |
| Frequency | 50/60Hz |
| Net Weight | 41 kg |
| Shipping Dimension | 50 × 50 × 50 cm |
| HS Code | 8414599099 |
| Country of Origin | Germany |
| Warranty | 1 year manufacturer warranty |
| Ship From | Hong Kong |
| Lead Time | 5 business days |
| Delivery Time | 3-8 business days worldwide (DHL/UPS) |
| Guarantee | 30-day return policy • 100% customer satisfaction |
Engineering Excellence
🛠️ Heavy-Duty German Bearings
Precision industrial-grade ball bearings with high-temperature grease ensure maintenance-free operation beyond 10+ years even under extreme continuous loads.
🔇 Noise-optimized Centrifugal Design
Advanced scroll housing and dynamically balanced impeller reduce turbulence and noise, making it suitable for acoustic-sensitive environments.
⚡ High Efficiency Three-Phase Motor
3.9kW with only 11.0/6.4A current draw delivers exceptional energy savings. Three-phase 400V operation provides stable, efficient power for demanding industrial applications.
💨 High Static Pressure & Airflow
1300 rpm centrifugal design generates excellent air movement for heat dissipation in industrial machinery, cooling towers, and HVAC systems.
🚚 Shipping & Service Guarantee
Shipping From: Hong Kong – efficient global distribution hub.
Processing: Orders ship within 5 business days.
Express Delivery: 3-8 business days worldwide via DHL or UPS.
Genuine Promise: Only original ZIEHL-ABEGG factory-sealed products, meet all fit, form and function specifications.
Warranty & Returns: 1-year manufacturer warranty + 30-day hassle-free returns.
📦 Bulk / Large Quantity Inquiries: Contact [email protected] for volume pricing and custom logistics solutions.
❓ Frequently Asked Questions
Q1: How does this fan achieve over 10 years of reliable operation?
The RD31S-4DW.6Q.AL features heavy-duty die-cast housing, German-made premium industrial bearings, and a thermally protected motor. ZIEHL-ABEGG's rigorous testing ensures it withstands dust, humidity, vibration, and continuous duty cycles beyond a decade.
Q2: Is it quiet enough for commercial environments despite its power?
Yes. Thanks to its precision-balanced centrifugal impeller and optimized scroll housing, noise levels are remarkably low for its 3.9kW power class, making it suitable for commercial buildings and hospitals.
Q3: Why choose three-phase 400V for industrial applications?
Three-phase operation provides smoother power delivery, higher efficiency, and better reliability for continuous industrial use. It's the standard for manufacturing facilities worldwide.
Q4: What cooling performance can I expect for large industrial applications?
The powerful 3.9kW centrifugal design delivers exceptional static pressure and airflow, ensuring superior heat dissipation for cooling towers, industrial machinery, power plants, and heavy-duty HVAC applications under extreme thermal loads.
Need Expert Advice or Volume Discounts?
Our technical team is ready to assist with application matching, performance data, and custom quotations for OEM and industrial projects.
📧 Request Technical Support 💰 Request Volume PricingCustomer Testimonial
"We installed the RD31S-4DW.6Q.AL in our manufacturing plant's cooling tower system, and the performance is outstanding. After 20 months of 24/7 operation, it runs smoothly with minimal noise despite the powerful 3.9kW output. The 11.0/6.4A current draw is incredibly efficient—saving us significant energy costs. The 41kg German build quality is rock solid. Perfect for demanding industrial environments where reliability and energy savings are critical. Highly recommended for heavy-duty cooling tower applications!"
— Thomas Richter, Plant Operations Director
Verified Buyer · Industrial Cooling Tower System · April 2026
* All products are 100% genuine ZIEHL-ABEGG. Specifications are subject to manufacturer updates. Contact us for compatibility check.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Great product for sensitive skin
These are gentle I really like them! Moisturizing is the having secret to treating blemishes. I highly recommend them and I would buy it again.
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Reviewed in the United States on January 21, 2026
★★★★★ 5
Barely noticeable
I like that these are almost completely invisible on the skin instead of like other patches where they are clear to see
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Reviewed in the United States on January 19, 2026
★★★★★ 5
Best acne spot patches!
The best ace patches! I first bought them on a trip to Japan, and was using them sparingly until I ran out. They came fast and are about the same price as in Japan. Would absolutely recommend!
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Reviewed in the United States on October 7, 2025
★★★★★ 5
Best toy, the end
Style: Sport, Size: 12in, Style: Sport, Size: 12in
Combined with the Max Glow ball, this is the best dog toy available on modern planet Earth.
I have a burly 92lb. pit bull mix with highly developed prey drive, and she will chase the glow ball for hours if I let her.
The tiny sport launcher (Sport 12M) is the best, because you can still throw the ball really far, but you can also slam the ball down a few feet away from yourself so it bounces up in the air and your dog has to jump to catch it, or you can throw it up really high so it bounces 15' away or so and your dog can jump to catch it. We sometimes have to play fetch in a pretty small area, so it's nice to have the small launcher for these games. The larger launchers aren't as fun in small areas. You can play the same games but it's trickier to throw the ball correctly.
Also, the small launcher is a lot easier to carry. The small launcher fits in my dog-walk-stuff backpack (with the ball in the launcher so I don't have to dig for it later), but the big ones don't easily. The launcher also has a hole in the end so you can hang it from your bag or whatever with a carabiner. The big ones are too long for that in most cases, and swing back and forth.
Also-also my dog loves to ask for the launcher, then when I give it to her she plays keep-away and it's adorable. The big launcher I have is harder for her to balance in her mouth, so she just lays down and chews on it until it gets taken away. She's chewed on all of the four Chuck Its we've owned, but she's only broken one (a big one), but that's because she got ahold of it when no one was home. The little one in my bag is totally chewed up but still works great. I think they're sturdier than the big ones. Except for the launcher she chewed into pieces, which was our fault, the only reason we've had to replace anything was because we lost it. Usually we keep the launcher and ball in the backpack so she can't get to them and so they don't get lost, so we rarely have to replace them. There is just not a better value in toys, and the startup price is really low.
Once again I really recommend the glow ball! It doesn't get soggy no matter how wet the grass or the dog mouth is. It is fun to chase because it is slippery and it collapses when it's squeezed, so it pops out of the dog's mouth and flies away if they bite it at the wrong angle; it's really bouncy, and stays bouncy because it can't be popped; it whistles so you can usually hear it even if you can't see it; and it really glows enough for nighttime catch, even if you only have your cellphone flashlight to charge it up!
UPDATE:
I should have said, we have the 12M launcher, which means the handle is 12 inches long and it uses a medium-sized ball. The medium ball is 2.5 inches in diameter, so the launcher will fit regular tennis balls, too! But my dog won't play with regular tennis balls anymore because they aren't anywhere near as fun as the glow balls, and I think she doesn't like having gross sloshy muddy tennis balls in her mouth.
I lost my short launcher awhile back and could only get a long one locally to replace it, which reminded me that you have to lean over a lot further to use the short launcher. So if you have trouble leaning over to the point that your hand is a foot above the ground, this may be hard for you to use.
I wish Amazon would let us choose colors, because my old one was green, and the big one is orange, both of which are bright enough to see in the grass from far away, even at night.
Still, best toy!
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Reviewed in the United States on May 19, 2017
★★★★★ 5
Highly recommend.
Style: Sport, Size: 12in
Love this. Dog sitting for a dog that loves to chase balls but my shoulder doesn’t like throwing them. Got this yesterday and it’s perfect. Real arm/shoulder saver.
Seems sturdy and I was concerned that a standard tennis ball would not work. We tend to lose balls when walking because this lab insists on carrying the ball in its mouth. They work.
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Reviewed in the United States on March 22, 2026
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