Induced Draft Fan for Waste Heat Recovery

Product Specifications

Technical details and manufacturing context for Induced Draft Fan

Definition

An induced draft fan is a critical component in waste heat recovery systems that operates by creating negative pressure (suction) to pull hot exhaust gases from industrial processes through heat exchangers or boilers. It ensures proper flow of flue gases, maintains system pressure balance, and facilitates efficient heat transfer for energy recovery. The fan is typically installed at the outlet of the heat recovery equipment, downstream of the process, to overcome the resistance of ducts, heat exchangers, and other components. It is available in various configurations, with impeller and casing materials such as carbon steel, stainless steel, or cast iron, depending on the corrosiveness and temperature of the gas stream. Key parameters include air volume (10,000–500,000 m³/h), static pressure (1,000–8,000 Pa), operating temperature (-20 to 250 °C), motor power (15–250 kW), voltage (380 V, 3-phase, 50 Hz), speed (960–1450 rpm), noise level (75–95 dB(A) at 1 m), weight (500–5000 kg), and IP rating (IP54–IP65). These values are reference ranges and must be confirmed for the specific application. The fan is selected based on system demand, resistance, and temperature, and must be matched to the fan curve. Standards such as ISO 5801 for performance testing, IEC 60034 for motors, IEC 60038 for voltage/frequency, ISO 13347 for noise, GB/T 700 for materials, and IEC 60529 for IP rating are used as procurement references. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The fan's impeller rotates at high speed, creating a low-pressure zone that draws exhaust gases into the system. This negative pressure overcomes system resistance and ensures continuous flow of hot gases through heat recovery equipment, allowing for maximum heat extraction before gases are discharged through the stack. The impeller is driven by a motor, either directly or via belt drive, and the speed is typically in the range of 960–1450 rpm. The fan must be selected to match the system's required air volume and static pressure, and the operating temperature must be considered to avoid overheating, which may require cooling measures. The fan's performance is verified according to ISO 5801, and its noise level is measured at 1 meter distance per ISO 13347.

Common Materials

Carbon Steel, Stainless Steel, Cast Iron

Technical Parameters

Parameter	Typical range	Notes & selection driver
Air Volume	10000–500000 m³/h	Select based on system demandISO 5801
Static Pressure	1000–8000 Pa	Overcome system resistanceISO 5801
Operating Temperature	-20–250 °C	High temp requires cooling
Motor Power	15–250 kW	Match fan curveIEC 60034
Voltage	380 V	3-phase, 50 HzIEC 60038
Frequency	50 Hz	Standard gridIEC 60038
Speed	960–1450 rpm	Direct or belt drive
Noise Level	75–95 dB(A)	At 1 m distanceISO 13347
Impeller Material	Q235/304	Stainless for corrosiveGB/T 700
Casing Material	Q235/304	Stainless for corrosiveGB/T 700
Weight	500–5000 kg	Including motor
IP Rating	IP54–IP65	Dust and water protectionIEC 60529

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Impeller
Rotating component that creates airflow through centrifugal or axial action

Material: Carbon Steel or Stainless Steel
Housing/Casing Part
Encloses the impeller and directs airflow through the system

Material: Carbon Steel
Shaft Part
Transmits torque from motor to impeller

Material: Alloy Steel
Bearings
Support the rotating shaft and reduce friction

Material: Steel with lubricated surfaces
Motor
Provides rotational power to drive the fan

Material: Copper windings, steel housing
Belt Drive Optional
Sets fan speed independently of motor speed on belt-driven builds.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Waste Heat Recovery System

View system integration details

Manufacturers of Induced Draft Fan

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

FREYA Electric Actuator

Tianjin, CN

Also makes: Pneumatic Actuator, Valve Actuator, Power Plant

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the primary function of an induced draft fan?

It creates negative pressure to pull hot exhaust gases from industrial processes through heat recovery equipment, ensuring proper flow and efficient heat transfer.

What materials are commonly used for the impeller and casing?

Common materials include carbon steel (Q235), stainless steel (304), and cast iron. The choice depends on gas corrosiveness and temperature.

How is the fan selected for a specific application?

Selection is based on required air volume, static pressure, operating temperature, and system resistance. The fan curve must be matched to the system demand.

What standards are relevant for verification?

ISO 5801 for performance, IEC 60034 for motor, IEC 60038 for voltage/frequency, ISO 13347 for noise, GB/T 700 for materials, and IEC 60529 for IP rating. Always verify with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 10 kPa (1.45 psi) negative pressure differential, with reinforced designs for higher pressure applications
flow rate:	10,000 to 500,000 m³/h (5,900 to 294,000 CFM) depending on model and configuration
temperature:	Up to 400°C (752°F) continuous operation, with higher temperature materials available for specific applications
slurry concentration:	Not applicable - designed for gas handling only, solid particles limited to <50 mg/m³ with appropriate filtration

Induced Draft Fan

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards