G4-68 Series / Boiler Forced Draft
G4-68 Boiler Centrifugal Forced Draft Fan
Centrifugal forced draft fan for boiler combustion-air supply, industrial furnace air systems and other clean-air process duties. Selection is based on required airflow, pressure, fan speed, motor power, rotation and outlet arrangement.
No. 8–16 16,011–161,499 m³/h 589–6,681 Pa
AIRFLOW
16,011–161,499 m³/h
TOTAL PRESSURE
589–6,681 Pa
MOTOR POWER
7.5–315 kW
SPEED
580–1450 rpm
G4-68 Series
Technical Index
01 Overview 02 Construction 03 Performance 04 Arrangement 05 Applications 06 Selection 07 Replacement 08 Resources 09 FAQ
Quick Facts
No. 8–16
D-Type Drive
Single Inlet
Air ≤80°C
Left / Right Rotation
D-Type Drive
Single Inlet
Air ≤80°C
Left / Right Rotation
01 / Engineering Overview
Combustion-Air Supply for Boiler Forced Draft Systems
G4-68 is a centrifugal forced draft fan developed for boiler ventilation and combustion-air supply. The series is commonly applied to steam boiler forced-draft systems and can also be used for other industrial clean-air ventilation duties when the required operating point falls within its range.
Unlike the Y4-68 induced draft series, G4-68 handles clean air rather than boiler flue gas. Standard reference service is based on air with a temperature not exceeding 80°C, so gas temperature and medium condition should still be confirmed before final selection.
G4-68 = Forced Draft
Use G4-68 when the fan is supplying combustion air or process air. Boiler flue-gas extraction belongs to the Y4-68 induced draft series.
02 / Construction
Industrial D-Type Centrifugal Fan Construction
01
Impeller
12 backward-inclined airfoil blades designed for stable centrifugal airflow.
02
Volute Casing
Welded steel spiral casing for conversion of impeller velocity into pressure.
03
Inlet
Streamlined converging inlet mounted on the casing inlet side.
04
Inlet Damper
Adjustable inlet device for airflow regulation when required by the system.
05
D-Type Drive
Fan shaft and motor connected through an elastic coupling.
03 / Performance Data
G4-68 Reference Performance
Reference data for preliminary model comparison. Final operating point should be confirmed against the actual boiler or process-system resistance.
SIZE
RPM
REF.
PRESSURE Pa
AIRFLOW m³/h
MOTOR
POWER
No.8D
1450
1
1481–2178
16,985–30,134
Y180M-4
18.5 kW
No.9D
1450
1
1874–2757
24,183–42,906
Y200L-4
30 kW
960
1
824–1207
16,011–28,407
Y160L-6
11 kW
No.10D
1450
1
2315–3404
33,173–58,856
Y250M-4
55 kW
960
1
1010–1491
21,963–38,966
Y180L-6
15 kW
730
1
589–863
16,701–29,631
Y160L-8
7.5 kW
No.11.2D
1450
1
2904–4277
46,606–82,688
Y280M-4
90 kW
960
1
1275–1874
30,856–54,745
Y225M-6
30 kW
730
1
736–1079
23,464–41,629
Y180L-8
11 kW
No.12.5D
1450
1
3620–5327
64,791–114,952
Y315L1-4
160 kW
960
1
1589–2335
42,896–76,106
Y280S-6
45 kW
730
1
912–1354
32,619–57,872
Y225M-8
22 kW
No.14D
1450
1
6327–6681
91,027–114,518
Y355M2-4
250 kW
1450
2
4532–6023
126,263–161,499
Y355L2-4
315 kW
960
1
2776–2923
60,266–75,819
Y315S-6
75 kW
960
2
1991–2639
83,595–106,924
Y315M1-6
90 kW
730
1
1148–1697
45,827–81,307
Y280S-8
37 kW
No.16D
960
1
2600–3826
89,960–159,606
Y355M1-6
160 kW
730
1
1501–2207
68,407–121,367
Y315M1-8
75 kW
580
1
952–1393
54,351–96,429
Y315S-10
45 kW
Performance values are reference data for preliminary model selection. Final selection should be confirmed against actual airflow, system resistance, air temperature, altitude and project electrical requirements.
04 / Rotation & Arrangement
Confirm Rotation and Outlet Angle Before Ordering
Rotation
Left-hand or right-hand rotation, viewed from the motor side.
Outlet Angles
0° / 45° / 90° / 135° / 180° / 225°
Drive
D-type arrangement with elastic coupling.
Inlet Control
Inlet damper arrangement can be used for airflow adjustment.
05 / Application Fit
Typical G4-68 Forced Draft Applications
Industrial Furnace Air
Process-air and combustion-air supply for furnace systems.
Process Air Supply
Medium-pressure clean-air supply for industrial process systems.
General Ventilation
Clean-air industrial ventilation where the operating point matches the G4-68 range.
06 / Before Selection
Information Required for G4-68 Selection
01
Airflow
Required combustion-air or process-air volume.
02
Pressure
Required static or total pressure.
03
Air Temperature
Normal and maximum inlet-air temperature.
04
Rotation
Left-hand or right-hand rotation.
05
Outlet Angle
Required discharge direction and duct arrangement.
06
Electrical
Voltage, frequency, phase and motor requirements.
Pressure not available?
Send boiler capacity, duct layout, airflow requirement and available system information. Read the engineering guide →
07 / Replacement Projects
Replacing an Existing Boiler Forced Draft Fan?
Send the existing fan model, nameplate, inlet and outlet dimensions, rotation, outlet angle, motor information, installation photos and available operating data. These can be used as the starting point for engineering comparison.
08 / Technical References
Related Engineering Guides
AIRFLOW & PRESSURE
Industrial Fan Airflow and Pressure Explained → ROTATION & OUTLET
Fan Rotation and Outlet Angle Guide → SYSTEM RESISTANCE
What to Send When Static Pressure Is Unknown → Product Path
Continue Through the Boiler Fan Range
Boiler & High-Temperature Fans
Browse boiler forced draft, induced draft and high-temperature fan products.
Industrial Forced Draft Fan System
Understand system-level forced-draft fan selection.
09 / FAQ
G4-68 Forced Draft Fan Questions
What is the G4-68 fan used for?
G4-68 is primarily used for boiler forced-draft and combustion-air supply, as well as suitable clean-air industrial ventilation duties.
Is G4-68 a forced draft or induced draft fan?
G4-68 is the forced-draft / ventilation version. Y4-68 is the corresponding induced-draft series for boiler flue-gas handling.
What is the G4-68 airflow range?
Published reference performance covers approximately 16,011 to 161,499 m³/h depending on fan size and speed.
What air temperature can G4-68 handle?
Standard reference service is for clean air at temperatures not exceeding 80°C. Higher-temperature conditions should be reviewed separately.
Can rotation and outlet direction be specified?
Yes. G4-68 can be configured for left or right rotation with 0°, 45°, 90°, 135°, 180° or 225° outlet positions.
Can the motor be supplied for different voltages and frequencies?
Motor selection can be reviewed according to required voltage, frequency, phase and destination-market project requirements.
G4-68 Selection Request
Send the Boiler Duty Point. We Review the Fan.
Airflow · Pressure · Air Temperature · Rotation · Outlet Angle · Voltage · Frequency · Quantity