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Description
RD25S-4DW.4N.2L ZIEHL-ABEGG Centrifugal Fan 3~230/400V 0.31/0.37kW 0.68/1.35A 880/1560rpmMADE IN GERMANY ENERGY SAVING CENTRIFUGAL FAN ZIEHL ABEGG RD25S 4DW. 4N. 2L Centrifugal Fan German engineered for 10+ years of continuous operation, whisper quiet dual speed performance (880 1560rpm), energy saving 0. 31 0. 37kW motor, and high static pressure centrifugal airflow the ideal cooling solution for demanding industrial and commercial systems. DOWNLOAD OFFICIAL DATASHEET (PDF) Core Performance Advantages 10+ Years Industrial Durability
🇩🇪 MADE IN GERMANY | ENERGY-SAVING CENTRIFUGAL FAN
ZIEHL-ABEGG RD25S-4DW.4N.2L Centrifugal Fan
German-engineered for 10+ years of continuous operation, whisper-quiet dual-speed performance (880/1560rpm), energy-saving 0.31/0.37kW motor, and high-static pressure centrifugal airflow – the ideal cooling solution for demanding industrial and commercial systems.
📄 DOWNLOAD OFFICIAL DATASHEET (PDF)Core Performance Advantages
10+ Years Industrial Durability
ZIEHL-ABEGG German engineering with premium ball bearings, reinforced housing, and robust 28kg build. Exceeds 10+ years of continuous operation in harsh environments with minimal maintenance.
Ultra-Quiet Operation
Advanced aerodynamic blade profiling and precision dynamic balancing drastically reduce turbulence and noise. Ideal for hospitals, offices, residential areas, and noise-sensitive facilities.
Energy Efficient Low Power
Consumes only 0.31/0.37kW with 0.68/1.35A current draw (3~230/400V). Dual-speed operation optimizes energy usage – perfect for 24/7 continuous duty cycles.
High-Volume Centrifugal Airflow
Powerful dual-speed centrifugal airflow (880/1560 rpm) delivers exceptional static pressure and directional air movement. Provides superior heat dissipation for data centers, power electronics, and industrial systems.
Industry Applications
The RD25S-4DW.4N.2L is trusted across multiple sectors requiring reliable, high-efficiency centrifugal ventilation.
Industrial Ventilation
Commercial Air Conditioning
Industrial Refrigeration
Heating Systems
Electrical Automation
Frequency Converters
Rail Transportation HVAC
HVAC (FFU/AHU)
Air Purification Systems
New Energy Vehicles
Data Center Cooling
Hospital HVAC Systems
Laboratory Ventilation
Telecom Equipment Cooling
Battery Storage Systems
Marine & Shipboard HVAC
Technical Specifications
| Model No | RD25S-4DW.4N.2L GENUINE |
| Article No | 210474 FACTORY CODE |
| Motor No | RZ25S-4DW.4N.2L MOTOR CODE |
| Condition | Original new from manufacturer |
| Power | 0.31 / 0.37 kW DUAL SPEED |
| Voltage | 3~230/400V THREE PHASE |
| Current | 0.68 / 1.35 A OPTIMIZED DRAW |
| Speed | 880 / 1560 rpm HIGH AIRFLOW |
| Frequency | 50/60 Hz |
| Manufacturer | ZIEHL-ABEGG GERMANY |
| HS Code | 8414599099 |
| Country of Origin | Germany MADE IN GERMANY |
| Product Type | Centrifugal fan INDUSTRIAL GRADE |
| Warranty | 1 year PEACE OF MIND |
| Net Weight | 28 kg HEAVY DUTY |
| Shipping Dimension | 55*55*50 cm |
| Ship From | Hong Kong |
| Lead Time | 5 days |
| Delivery Time | 3-8 days |
| Ship By | DHL / UPS |
📦 Shipping, Warranty & Service
Sell and ship only genuine products from factory.
Promise: Meet all factory specs, fit, form, and function.
Shipping From: Dispatched from Hong Kong – fast global distribution hub.
Processing Time: Orders are processed within 5 business days.
Express Delivery: Worldwide delivery in 3-8 business days via DHL / UPS.
Warranty: Full 1-year manufacturer warranty backed by ZIEHL-ABEGG.
30-Day Returns: 30-day return policy & 100% customer satisfaction commitment.
Volume Pricing: For large quantity inquiries: [email protected]
Frequently Asked Questions
🔹 Q1: What makes this fan last over 10 years?
A: The RD25S-4DW.4N.2L features German-engineered construction with premium ball bearings, reinforced housing, and robust 28kg build. Designed for continuous industrial duty with minimal wear, ensuring a service life exceeding a decade.
🔹 Q2: How quiet is the dual-speed operation?
A: Despite its high airflow capacity, the aerodynamically optimized impeller and precision balancing drastically reduce noise at both speed settings. It is well-suited for noise-sensitive environments such as hospitals, labs, and office buildings.
🔹 Q3: How does the dual-speed motor save energy?
A: With optimized current draw of 0.68/1.35A and high efficiency across 230/400V three-phase power, you can select lower speed for reduced energy consumption or higher speed for maximum cooling, lowering operational costs especially in 24/7 applications.
🔹 Q4: What cooling performance can I expect?
A: The dual-speed centrifugal airflow (880/1560 RPM) delivers exceptional static pressure and volumetric flow, ensuring superior heat dissipation for industrial machinery, data centers, and HVAC systems.
Need a Reliable High-Performance Centrifugal Fan?
Contact our technical team for application support, bulk quotes, or customized solutions.
📧 Request Technical Support 📊 Request Volume Pricing⭐ Customer Reviews
★★★★★ Verified Buyer – Industrial HVAC Engineer
"Exceptional German quality from ZIEHL-ABEGG. The RD25S-4DW.4N.2L runs incredibly quiet at both 880 and 1560rpm while delivering powerful centrifugal airflow. The dual-speed 0.31/0.37kW motor provides excellent energy flexibility. Build quality is outstanding at 28kg – clearly designed for 10+ years of heavy-duty service. Perfect for our industrial ventilation and server room cooling. Highly recommended."
— Stefan W., Facility Operations Director
✅ Verified Purchase · Reviewed on May 28, 2026
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
4.0 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Sturdy. Tight fit. No wobble
Size: 2 Pairs / 4 pcs
These are the best ones I’ve found. This order will connect one wire. Luckily that’s what I needed. If you’re doing more than one wire…
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Superior Design!
Size: 6 Pairs / 12 pcs
Delivery was lightning fast.
I tried a pack of two pairs of these banana jacks as a sample to see if these would meet my needs. The design of these plugs is superior. The design was exactly what I wanted because the speaker wire is secured with TWO set screws. Then I ordered an additional six pairs of plugs to hook up my subwoofer to my amp and speakers.
(I feed the audio output from the amp to the sub. The sub has a crossover that keeps the low frequencies and sends the mid and treble frequencies to my bookshelf speakers.)
I love the security of two set screws on each plug and love the barrel that screws on AFTER the wire is secured by the set screws. Most banana plugs have a hole through the shaft of the plug that receives the stripped wire. Then the barrel cover is screwed down to secure the wire in the plug. This design compresses the speaker wire but eventually the cap loses it grip and allows the connection between the wire and the plug to become loose. Then the transfer of the audio signal becomes poor and the speakers sound bad. Every month or two I needed to check all the banana plugs and re-tighten many of them for the best performance. The two set screws eliminate this problem. The set screws are quite small and take a little extra care in installation. You will need a small flat blade screwdriver to tighten them. I used the 1/8" flat blade driver from a set of jewelers screwdrivers.
These well made plugs are a bit pricier that many of the banana plugs available but certainly not the priciest plugs available. For me, the slightly higher price was more than offset by the security of the wire within the plug.
I'm not thrilled with the extra tight fit of the tip on the plugs into the jacks. It took a lot of effort to insert the in the jack. Actually I "greased" the pins (very sparingly) with with non-corrosion, conductive paste (Ox-Gard, No-Corrode, etc. Do NOT use any other grease.) Next time I'll use pliers to compress the pin.
My only quibbles are that the spring pins that go into the jack are very tight and that the plugs are only sold in quantities of two pairs or 12 pairs.
I recommend these banana plugs for all who are using the banana plugs and jacks for hooking up your speakers. It's a very convenient way of connecting speakers if your speakers and amplifier have the banana jack as part of the binding post. Further, it's much safer to use banana plugs since the possibility of shorting your amplifier with a stray strand of wire is practically zero. Easy Five Stars.
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Reviewed in the United States on April 13, 2018
★★★★★ 5
Top banana
Size: 5 Pairs / 10 pcs
Theses banana plugs are hight quality non magnetic. Banana plugs easy to usexand very high quality sound different because of the better connection and quality.
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Reviewed in the United States on May 24, 2026
★★★★★ 5
Very easy to use
Size: 12 Pairs / 24 pcs
I have an Onkyo audio/video receiver along with an Emotiva amplifier. Both have speaker "post" terminals which will accept banana plugs, OR I can connect the speaker wires by unscrewing the posts, poke the speaker wires into the terminals and then tighten the posts. The problem with poking the wires into the terminals and tightening the posts vs using banana plugs is that there is a risk of the wires touching the metal on the back of the chassis or touching other speaker wires, causing a short if one is not careful. With banana plugs, they simply plug into the back/top of the posts, eliminating the rsick of a short circuit. They can also be unplugged very easily if needed. Banana plugs are DEFINITELY the preferred way to connect speakers to an receiver or amplifier if they have post-style terminals.
These particular banana plugs came in a package of 12 I believe. They were very reasonably priced, and simple to connect to the end of the speaker wires. Simply unscrew the banana plugs, use a small, standard jewelry screwdriver and loosen both of the set screws, insert the speaker wire, then tighten the set screws, and then screw the banana plug back together.
The plugs have either a red band which would typically be used for your "Right" speakers, or a black band which would typically be used for the "left" speakers. The banana plugs insert into the top or front of the speaker terminal posts on the amp and receiver. They fit VERY snug, and so I did have to apply just a little bit of pressure in order to insert them into the posts, but once plugged in, rest assured they're not going anywhere. They are snug.
I highly recommend these.
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Reviewed in the United States on January 2, 2025
★★★★★ 5
Flexible PVC Cable
Size: 2 Gauge 10FT
If you like the slick, shiny surface of PVC but want the flexibility of welding cable, this is a pretty good option. Easy to shape and makes solid crimps. One of my favorites.
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Reviewed in the United States on April 28, 2026