Here are some tips for connecting air ducts to fans, air handling units, and HVAC equipment to minimize misalignment, vibration, and maintenance difficulties.
The connection point between the ductwork and the fan or HVAC equipment requires careful coordination between design, fabrication, and installation. If the connector size doesn't match, the ductwork is misaligned, or insufficient maintenance space is left, adjustments may need to be made immediately before commissioning. Pre-installation review helps reduce this risk.
1. Compare the dimensions and connection direction.
Before fabricating the connection, it is necessary to confirm the dimensions of the equipment's inlet/outlet, airflow direction, elevation, and distance to the structure. The approved equipment drawings or technical documentation must be used, not just on-site estimations.
2. When should flexible couplings be inspected?
Depending on the design, flexible couplings may be used at fan connections to limit vibration transmission between the equipment and the ductwork. The material, size, and installation method must be appropriate for the temperature, pressure, operating environment, and specific system requirements. Flexible couplings should not be stretched, twisted, or used to compensate for excessive dimensional deviations.
3. Maintenance space layout
Access to inspection hatches, filters, motors, valves, or other components requiring maintenance must be maintained as per the manufacturer's instructions. Piping should not obstruct equipment removal or component replacement. If space differs from the drawing, a solution must be agreed upon before finalizing the routing.
4. Pre-connection checklist
The checklist helps the construction team inspect each joint before completion.
| Category | Request for review | Risks of ignoring |
| Connector size | Correct size and device configuration | The fit is incorrect; it needs to be re-machined. |
| Airflow direction | Correct orientation according to the system diagram. | Reduced operational efficiency or incorrect installation |
| Coaxiality/Alignment | Do not force connections that deform the pipe. | Leakage or power transmission to the device. |
| Flexible coupling | Correct type, not twisted or stretched. | Reduced ability to work according to design |
| Maintenance space | The part to be inspected is accessible. | Difficult to maintain and replace equipment. |
Conclusion
Connecting ductwork to equipment requires confirmation from technical data, actual dimensions, and maintenance conditions. Pre-production inspection of the connection helps minimize on-site modifications and maintain the correct design configuration.
Contact Sao Viet Air Ducting
Sao Viet Air Ducting Company manufactures air ducts and accessories according to project drawings. Contractors should provide equipment drawings, connector dimensions, and any special requirements to finalize the production scope.
SAO VIET AIR DUCT MANUFACTURING AND TRADING COMPANY LIMITED
Address: 267 Le Thanh Tong, May Chai, Hai Phong
Hanoi Representative Office: No. 19, Lane 24, Kim Dong Street, Giap Bat Ward, Hoang Mai District, Hanoi
Hotline: 0815.999.826 – 0934.559.168 | Technical support: 0949.852.886
Email: vietonggio@gmail.com
