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Is Your Centrifugal Fan Delivering Insufficient Airflow?

Low Airflow in Your Centrifugal Fan?

Check These 4 Things in 1 Minute:

1️⃣ Check the Rotation Direction
Place a piece of paper at the air inlet. If it doesn’t get pulled in, the fan may be rotating in reverse. For three-phase motors, swapping any two power phases can solve the problem immediately.

2️⃣ Check the Speed
Is the belt loose? Has the VFD (variable frequency drive) frequency been reduced? A drop in speed directly reduces airflow.

3️⃣ Inspect for Blockages
Check the filter, duct elbows, and dampers. Make sure all dampers are fully open. In many cases, reduced airflow is simply caused by dust buildup or obstructions.

4️⃣ Inspect the Impeller
After shutting down the fan, check whether the blades are covered with oil, dust, or debris, and look for wear or damage. Cleaning or replacing the impeller can quickly restore airflow performance.

👉 Already checked all four but still have low airflow?
Leave your fan model and years of service in the comments, and I’ll help you troubleshoot the issue.

Customer Testimonials

Trusted by industrial partners across 30+ countries — real feedback from our global clients.

“We’ve been using Dajing’s 9-19 high-pressure centrifugal blowers for our dust removal system. The airflow performance is excellent, and the noise level is much lower than our previous models. Truly reliable quality.”

Ali Rahman Maintenance Engineer, Power Plant – UAE

“The 4-72 series blowers from Dajing have been running non-stop in our cement production line for two years with zero breakdowns. Their team provided fast delivery and technical guidance during installation.”

Sergey Ivanov Production Manager, Cement Factory – Kazakhstan

“Our HVAC contractor switched to Dajing’s products for a recent government building project. The energy efficiency and build quality exceeded expectations. Definitely a long-term partner.”

Mohamed Al-Farid HVAC Project Supervisor, Government Contractor – Saudi Arabia

“We ordered customized GY4-73 induced draft blowers for our boiler system. Dajing’s engineers adjusted the impeller size precisely to our parameters — performance and after-sales support were outstanding.”

Nguyen Thanh Binh Technical Director, Thermal Equipment Co. – Vietnam

FAQ's

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Contact Us

Our engineers will recommend the suitable blower type based on your air volume, pressure, temperature, and working conditions.
You can also send your technical parameters or drawings directly for evaluation.

All Dajing blowers are ISO9001 and ISO14001 certified.
Depending on customer needs, we can also provide CE, EAC, or other international compliance certificates.

Yes. We offer fully customized blower systems to meet special environmental or industrial requirements, including high-temperature, dust-removal, and corrosion-resistant designs.

Generally 7-15 working days after receiving the deposit, depending on the order quantity and customization level.

Yes. We provide online technical guidance, spare parts supply, and on-site service if required.
Our goal is to ensure your blower operates efficiently throughout its service life.