Fans
Airflow + pressure + application conditions
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From Requirement to Configuration
Engineering Support From Requirement to Product Configuration
Not every HVAC requirement can be solved by choosing a model from a catalogue. Projects may involve unusual temperatures, fixed installation dimensions, hazardous atmospheres, high filtration requirements, corrosive gases, difficult water conditions or equipment that must integrate with an existing system.
YONGFAN Technical Support helps customers organize these requirements and identify an appropriate product family, model range and configuration. You do not need to know the final model before contacting us.
Project Data
Drawings
BOQ
Equipment Schedule
Existing Datasheet
Nameplate Photo
Data · Family · Range · Configuration
What We Can Help With
Product Selection
If you know the duty but not the model, YONGFAN can help narrow the product range. Current fan documentation specifically includes airflow/static-pressure sizing and series-selection support.
Filters
Efficiency + airflow + resistance + dimensions
Heat Exchangers
Heat source + temperatures + load + water quality
Hydronic Equipment
Flow + head + system pressure
Chemical Filtration
Target gas + concentration + airflow + application objective
Configuration Review
When a Standard Model Needs Additional Options
A standard product platform may still require project-specific configuration. Technical support helps determine whether a standard model is sufficient, or a configured / customized product is required.
Dimensions
Materials
Motor
Voltage
Filtration grade
Pressure class
Actuator
Control method
Accessories
Explosion-proof
High-temperature
Standard model? Configured product? Custom build?
Options locked against the duty
Drawing Support
Coordinate the Product With the Project
For suitable products, YONGFAN technical support can provide relevant drawings and dimensional information. Current ventilation documentation includes dimensioned drawings and performance curves among pre-sales technical-support services. Heat-exchanger documentation also includes technical drawings and nozzle schedules for project design and installation.
- Duct coordination
- Plant-room layout
- Piping connections
- Equipment clearances
- Retrofit interfaces
- Tender submissions
Drawings · Curves · Nozzle schedules
Retrofit & Replacement Support
Replace by Specification—Not by Appearance
Existing equipment does not always have to be replaced with the same brand. But replacement selection should not be based only on external appearance, nominal size, or connection diameter.
Function
Performance
Dimensions
Connections
Electrical Requirements
Control Interface
For a retrofit enquiry, send as much of the following as possible:
- Existing manufacturer and model
- Nameplate photo
- Overall dimensions
- Flange / connection dimensions
- Airflow or flow, pressure, voltage
- Existing drawings
Selected YONGFAN fan products are documented with compatible flange arrangements across related configurations, illustrating why interface information can be important in retrofit work.
Function + Performance + Interface
Fan Technical Support
Start With the Duty Point
YONGFAN fan materials state that final selection should be confirmed against project airflow, static pressure and actual duty conditions.
- Required Airflow
- ______ m³/h
- Required Pressure
- ______ Pa
- Air Temperature
- ______ °C
- Application
- Ventilation / Exhaust / Smoke Control / Process / Tunnel
- Airstream
- Clean / Dusty / Humid / Corrosive / Hazardous
- Installation
- Duct / Wall / Roof / Tunnel / Other
- Electrical Requirement
- Voltage / Frequency / Phase
- Special Requirement
- Noise / High Temperature / Explosion-Proof
Airflow · Pa · Temperature · Duty
Air Filtration Support
Efficiency Is Only One Selection Parameter
YONGFAN’s filtration materials use airflow, resistance, cleanliness requirement and installation dimensions as relevant selection factors.
- Required Filtration Stage
- Primary / Medium / Final
- Efficiency Requirement
- Project grade or applicable classification
- Rated Airflow
- ______ m³/h
- Available Resistance
- ______ Pa
- Filter Size
- ______ × ______ × ______ mm
- Application
- Commercial HVAC / Cleanroom / Pharmaceutical / Electronics / Other
- Operating Conditions
- Temperature / Humidity
Stage · Grade · ΔP · Frame
High-Efficiency Filtration Support
Confirm the Complete Installation
For HEPA or other high-efficiency filtration, also provide housing type, seal arrangement, final-stage requirement, available fan pressure and required test documentation.
High-efficiency filter performance should be considered together with installation sealing and system resistance. Current YONGFAN filtration documentation references scan/leak testing for applicable high-efficiency grades.
Housing · Seal · Scan / leak test
Chemical Filtration Support
Identify the Contaminant Before Selecting the Unit
Chemical-filtration projects require more application information than ordinary particulate filtration. YONGFAN’s gas-phase filtration documentation explicitly distinguishes room-protection systems from exhaust-treatment systems and requests airflow, gas analysis and application function for selection.
H₂S
SO₂
Cl₂
NOx
NH₃
VOCs
Other
Protect Indoor Equipment
Control rooms, server rooms, electrical rooms, instrument rooms.
Treat Exhaust Before Discharge
A different architecture from room-protection systems.
- Also send
- Concentration (if available) · Airflow ______ m³/h · Room volume ______ m³ · Existing environmental data
Gas · Concentration · Protect or treat
Heat Exchanger Support
Start With the Thermal Requirement
YONGFAN’s heat-exchange documentation specifically uses heat source, temperatures, load and water quality to determine exchanger type, capacity and material.
- Heat Source
- Steam / Hot Water / Other
- Primary Side
- Inlet ______ °C · Outlet ______ °C
- Secondary Side
- Inlet ______ °C · Outlet ______ °C
- Heat Load
- ______ kW
- Flow
- ______ m³/h
- Working Pressure
- ______ MPa
- Water / Medium
- Describe water quality or process medium
- Storage Requirement
- Yes / No
Source · ΔT · kW · MPa
Material Selection Support
The Medium Matters
Material choice can be critical for heat exchangers and other water-contact equipment. If water or process conditions are unusual, provide chloride level, hardness, pH, temperature and process medium rather than selecting material only from price.
SUS304
316
316L
316Ti
Copper
Titanium
Hastelloy
Not price-first. Medium-first.
Hydronic Technical Support
Flow, Pressure and System Volume
- Flow
- ______ m³/h
- Required Head
- ______ m
- Working Pressure
- ______ MPa
- System Volume
- ______ m³
- Temperature / Pipe Size
- ______ °C · DN ______
Water Make-Up
Expansion
Water Supply
Distribution
Condensate Recovery
Treatment
Controls & Valve Support
Match the Control Function
For controls and valves, send valve function, DN, flow, differential pressure, connection type, voltage, control signal, normally open / normally closed, and existing actuator or controller information.
For retrofit projects, photos and the original product datasheet can significantly improve cross-reference accuracy.
Tunnel Ventilation Support
Tunnel Fans Require System-Level Data
Jet-fan selection cannot be reduced to airflow alone. YONGFAN’s SDS/SDS(R) materials identify selection factors including tunnel dimensions, traffic volume, vehicle emissions, CO / NOx limits, tunnel air velocity, fire-emergency requirement and installed thrust, and state that fan quantity and configuration are confirmed against project thrust calculations.
Tunnel Length
Cross Section
Traffic Data
Required Air Velocity
Fire Strategy
Existing Pressure / Thrust Calculation
Thrust · Velocity · Fire strategy
Smoke-Exhaust & Hazardous Applications
Critical-Duty Products Need Clear Requirements
Some applications involve safety-related operating conditions: fire smoke exhaust, hazardous-area ventilation, explosion-proof equipment, high-temperature emergency operation.
- Applicable project standard
- Required temperature / duration
- Hazardous-area classification
- Required Ex configuration
- Motor requirements
- Destination market
Selected YONGFAN fan materials reference GB 3836 for applicable explosion-proof variants and specify configuration-dependent safety requirements. Final applicability must be confirmed against the selected product and project requirement.
GB 3836 · Ex · Emergency duty
Technical Document Support
Cannot find the file you need?
Technical Support can help identify datasheets, performance curves, drawings, manuals, material information, test records and applicable certificates.
When requesting a document, provide product, model, configuration, required document and destination market. Applicable certificates should be confirmed by product and order configuration.
Project Submittal Support
Information for consultant and contractor review
Depending on product and project, technical support can help prepare technical specification, performance data, dimensions, materials, drawings, connection schedules and applicable test information.
Quoted equipment = submitted equipment
OEM Technical Support
Define the product before defining the brand
For OEM or private-label projects, first establish base product, performance, dimensions, materials, electrical configuration, options and applicable documentation. After the technical configuration is agreed, branding and packaging can be coordinated.
Pre-Order Technical Review
Confirm Critical Details Before Production
Correcting these points before production is usually much easier than correcting them after shipment.
Model
Is the correct series selected?
Duty
Does the configuration match the operating requirement?
Dimensions
Will the equipment fit?
Material
Is it suitable for the medium or environment?
Electrical
Are voltage and motor/control requirements correct?
Compliance
What standards or certificates are required?
Documentation
What drawings or technical files must be supplied?
Rule
Lock the configuration before the production release.
What Technical Support Does Not Replace
Project Design Responsibility Remains With the Project Team
YONGFAN can support product selection, configuration, product data, technical drawings and equipment-related guidance.
However, final building or process-system design may involve local codes, fire strategy, structural design, electrical design, overall control sequence and complete system calculations. These responsibilities should remain with the qualified project designer, consultant or responsible engineering organization.
This distinction is particularly important for fire, hazardous-area, pressure and life-safety applications.
Equipment support ≠ system design
How to Get a Faster Technical Response
Send More Than “Please Quote”
These enquiries allow the technical team to begin with actual engineering parameters.
“We need an exhaust fan for 22,000 m³/h at 850 Pa, handling humid industrial air at approximately 55°C.”
“We need an F9 filter for 3,200 m³/h in a 595 × 595 × 600 mm existing housing.”
“We need to protect a control room from H₂S and SO₂. Room volume is 450 m³ and required fresh air is approximately 2,000 m³/h.”
“We need a heat exchanger for 500 kW with 80/60°C primary water and 50/60°C secondary water.”
Submit Your Project
Send Whatever Information You Already Have
YONGFAN can help organize the requirement into application, product family, selection parameters, recommended configuration and technical documentation.
Application→
Product Family→
Selection Parameters→
Recommended Configuration→
Technical Documentation
BOQ
Equipment Schedule
Technical Specification
Drawing
Existing Datasheet
Nameplate Photo
Duty Point
Operating Conditions