News
02.10.2025
Forced Draft (FD) and Induced Draft (ID) fans are essential components in industrial air movement systems. Commonly found in boilers, furnaces, ovens, and dust collection systems, these fans ensure proper air circulation for combustion, ventilation, and pollution control.
Both FD and ID fans are types of centrifugal blowers, designed to handle varying air pressures and temperatures while maintaining energy efficiency and long service life.
In this guide, we’ll explore how these fans function, their key features, and why choosing the right FD or ID fan can significantly improve your plant’s performance.
An FD fan (Forced Draft fan) is designed to push air into the system, creating positive pressure.
In a boiler or furnace, the FD fan draws fresh air from the atmosphere and delivers it into the combustion chamber, ensuring the right air-to-fuel ratio for efficient burning.
These fans are often direct-drive systems, meaning the motor is directly connected to the impeller for maximum efficiency and minimal maintenance.
An ID fan (Induced Draft fan) performs the opposite role of an FD fan — it extracts air or flue gases from the system, creating negative pressure.
These fans remove hot exhaust gases produced during combustion and discharge them through chimneys or stacks, ensuring a steady and safe flow of air through the boiler or furnace.
ID fans are typically belt-driven, as they handle high-temperature gases and often need more flexibility in motor placement and vibration control.
Both FD and ID fans are engineered using internationally accepted industrial standards for efficiency, reliability, and safety.
Manufacturers pay special attention to impeller design and balance, as it directly impacts performance and durability. Impellers undergo static and dynamic balancing in compliance with IS grading standards to prevent vibration and mechanical wear.
Engineered for optimal airflow with minimal power consumption, reducing electricity costs significantly.
Constructed with high-quality materials (MOC) suited for high temperatures and dusty environments. Wear pads can be added to impellers handling heavy dust loads.
Advanced aerodynamic design reduces noise, enhancing workplace comfort and productivity.
Precision-balanced impellers and high-quality bearings ensure smoother operation and reduced maintenance.
Leading manufacturers provide tailored FD and ID fan solutions with ongoing maintenance, audits, and performance certificates for long-term reliability.
In a typical thermal power plant or boiler system, both fans play complementary roles:
Together, they maintain a stable pressure balance, ensuring efficient combustion, reduced emissions, and prolonged equipment life.
This combination of positive and negative air pressure ensures complete fuel burning and maintains optimal thermal efficiency — a crucial factor in reducing power consumption and operational costs.
When selecting an industrial fan, consider:
Partnering with trusted FD and ID fan manufacturers or suppliers ensures you get expert advice, quality certifications, and ongoing technical support.
Both Forced Draft (FD) and Induced Draft (ID) fans are vital to maintaining the efficiency and safety of industrial systems such as boilers, furnaces, and dust collection units.
By using high-quality centrifugal blowers designed to match your system’s needs, industries can achieve:
If you’re looking for efficient, durable FD and ID fans for your application, Fans and Blowers offers a complete range of industrial centrifugal fans engineered for maximum performance and reliability.
Return To News
Our Range
