You Do Not Need to Know the Fan Model
Send the operating information you already have – complete or incomplete. QIYUE FAN reviews the duty point, system condition, suitable fan family, performance curve, fan size, speed, motor, material and mechanical configuration before quotation.
Known Duty Point Or Pressure Unknown?
Start from the information already available. If airflow and pressure are known, move directly into fan-family and performance-curve selection. If airflow is known but pressure is not, review the duct and equipment resistance first instead of guessing a fan model.
Airflow + Pressure Are Available
Use the known duty point together with medium, temperature, electrical and installation conditions to match the fan family, performance curve, size, speed and motor.
Airflow + Pressure → Temperature / Medium → Fan Family → Performance Curve → Size / RPM / Motor → RFQ
Continue With Known Duty Data →Airflow Is Known, System Pressure Is Not
Start from the air path. Duct length, diameter, elbows, branches, filters, cyclones, scrubbers and other equipment are used to build the resistance review before selecting the fan.
Airflow → Duct / Equipment Data → Resistance Review → Pressure Basis → Fan Family / Model → RFQ
Start Pressure-Unknown Review →No reliable duty point? Start from the old fan evidence.
Nameplate, motor data, photos, GA drawing, inlet / outlet dimensions and the current operating problem can be used to begin the replacement review.
Replacement Review →What QIYUE Checks Before Selecting The Fan
Fan type, model and motor are outputs of the engineering review. Buyers do not need to determine these values before sending the inquiry.
Application
What the fan must do and where it operates in the system.
Airflow
Required m³/h, m³/s or CFM at the design condition.
Pressure & Resistance
Static or total pressure and resistance from the complete air path. If system pressure is unknown, provide duct, equipment and resistance information.
Medium
Clean air, dust, hot gas, humid gas, corrosive or hazardous medium.
Temperature
Normal and maximum temperature and relevant gas-density conditions.
Material
Carbon steel, stainless steel, FRP, thermoplastic or special alloy when required.
Electrical
Voltage, frequency, motor protection, fan speed and variable-frequency requirements.
Installation
Inlet, outlet, rotation, drive, foundation, available space and duct interface.
From Project Data To A Confirmed Fan Direction
The customer provides the operating requirement. QIYUE converts that information into a technical fan selection before commercial quotation.
Review Duty
Application, airflow, pressure and system condition.
Determine Fan Family
Review centrifugal, axial or special-duty directions.
Match Fan Curve
Confirm a suitable airflow-pressure operating point.
Confirm Size & RPM
Fan size, rotational speed and practical operating range.
Select Motor
Power, voltage, frequency and required motor margin.
Review Construction
Material, drive arrangement, sealing and special requirements.
Confirm Installation
Rotation, outlet direction, interfaces and installation space.
Issue Proposal
Selected model, technical information and quotation.
Tell Us The Working Condition – We Review The Construction
Special-duty requirements affect material, motor, sealing, bearing arrangement, speed and fan construction.
High Temperature
Send normal and maximum gas temperature, operating duration and medium condition.
Corrosive Gas
Send gas composition, concentration, moisture and temperature for material review.
Dust & Particles
Describe dust loading, particle condition and whether the fan is before or after separation.
Explosion Hazard
Provide hazardous-area requirements, gas or dust information and required motor standard.
50Hz / 60Hz
Frequency changes motor speed and can affect fan performance and motor selection.
Variable-Frequency Operation
Provide the required control range and operating points.
Continuous Operation
State operating hours, duty cycle and relevant reliability requirements.
Limited Installation Space
Send the existing footprint, duct interfaces and available equipment envelope.
Start With The Evidence You Still Have
Old projects often have incomplete records. A replacement inquiry can still begin from the existing fan.
Available Replacement Evidence
- Fan nameplate
- Motor nameplate
- Full fan photographs
- Inlet and outlet dimensions
- Foundation / base dimensions
- Existing drawing, datasheet or performance curve
Choose the Evidence Available
I Have a Nameplate — Read Nameplate Guide →
Technical References Used During Fan Selection
These guides explain individual engineering inputs used during fan selection. You do not need to calculate everything yourself before sending a selection request.
Operating Point Basics
Understand why airflow and pressure must be reviewed together.
Read Guide →Static vs Total Pressure
Confirm which pressure value is supplied.
Read Guide →Read the Fan Curve
Check airflow, pressure and operating point on the fan curve.
Read Guide →Fan Power Calculation
Review required fan and motor power after establishing the operating point.
Read Guide →Fan Drive Arrangement
Compare direct, belt and coupling arrangements.
Read Guide →Rotation & Outlet Angle
Confirm CW / CCW rotation and discharge direction.
Read Guide →Static Pressure Unknown
Start from duct, equipment and system information.
Start Here →Existing Fan Nameplate
Use existing fan and motor nameplate data as replacement evidence.
Read Guide →Send What You Know. Leave Unknown Items Blank.
Complete parameters are useful, but they are not required to start the inquiry. For Path A, send the known airflow and pressure. For Path B, mark pressure as Unknown and send the duct, filter, cyclone, scrubber or other resistance information currently available.
Application / process
Airflow: ______ m³/h
Pressure: ______ Pa / Unknown
Temperature: ______ °C
Medium: ______
Dust / corrosion condition: ______
Voltage / frequency: ______
Duct size / layout: ______
Rotation / outlet: ______ / Unknown
Quantity: ______ sets
Destination: ______
Existing photos / drawing: Available / No