• 🔥 Get Full Catalog
  • sales@longwellfans.com
  • Certifications
  • Factory & Quality
  • OEM Solutions
  • 🔥 Get Full Catalog
  • sales@longwellfans.com
  • Certifications
  • Factory & Quality
  • OEM Solutions
🔥 Get Full Catalog
  • Categories
    • Centrifugal Fans
      • Plug Fan
      • Anti-corrosion Centrifugal Fan
      • FFU Fans & Motors
      • Multi-wing Centrifugal Fan
      • Airfoil Centrifugal Fan
      • Backward Curved Centrifugal Fans
        • AC Fans
        • DC Fans
        • EC Fans
        • EC Plug Fans
      • Centrifugal Blower Fan
      • Forward Curved Centrifugal Fans
        • AC Forward Fans
        • DC Forward Fans
        • EC Forward Fans
      • Industrial Centrifugal Fans
    • Axial Fans
      • Proof Axial Fan
      • Industrial Ceiling Fan
      • Industrial Fans
        • Mist Fan
        • Industrial Wall Fan
        • Powerful Floor Fan
        • Commercial Floor Fan
        • Home Commercial Fan
        • Commercial Stand and Wall Fan
        • Industrial Tripod Stand Fan
      • Condenser Cooling Fans
      • DC Cooling Fan
      • Industrial Axial Blower
      • Internal Rotor Axial Fan
      • AC Axial Fan
      • Axial Compact Fan
      • DC Axial Fan
      • EC Axial Fan
      • Industrial Axial Fans
      • Tube Axial Fan
    • Cross Flow Fan
      • EC Cross Flow Fan
      • Elevator Cross Flow Fan
      • AC Cross Flow Fans
      • Cross Flow Impeller
      • DC Cross Flow Fans
      • Transformer Cooling Cross Flow Fan
    • Duct Fans
      • Anti-corrosion High Speed Air Exchange Duct Fan
      • EC Inline Duct Fans
      • Exhaust Ventilation Fans
      • Metal Duct Fans
        • AC Metal Duct Fans
        • DC Metal Duct Fans
        • EC Metal Duct Fans
      • Mixed Inline Duct Fan
        • AC Mixed Inline Duct Fan
        • EC Mixed Inline Duct Fan
      • Plastic Duct Fans
        • AC Duct Fan
        • EC Duct fans
      • PVC Duct Fan
      • Split Duct Fan
      • Square Duct Fans with Housing
      • Straight Through Duct Fan
      • Super Silent Duct Fans
      • Ceiling Duct Fan
      • Duct Fan Booster
      • Inline Centrifugal Fan
      • Inline Duct Fans
      • Metal Inline Fans
      • Mixed Flow Fans
      • Ultra Silent Duct Fans
    • Blowers
      • Air Movers & Blowers
      • Ventilation Fans and Blower Gather
      • Air Blowers
      • Exhaust Blowers
      • Floor Blowers
      • Gas Blowers
      • Lawn Blowers
    • Exhaust Fan
      • Bathroom Fans
      • Motor-cooling Fan
      • Wall Mounted Exhaust Fan
      • Bathroom Exhaust Fans
      • Industrial Exhaust Fans
      • Poultry Exhaust Fan
      • Wall Exhaust Fan
    • Commercial Fan & Blower
      • DDM Centrifugal Blower
      • AT Centrifugal Blower
      • REM Centrifugal Blower
      • RLM Centrifugal Blower
      • TEM Centrifugal Blower
      • ADH Centrifugal blowers
      • DD Direct Driven Centrifugal Blower
      • RDH Backward Centrifugal Blower
    • Motors & Drive System
      • AC Motors
        • AC Capacitor Motor
        • AC Gear Motor
        • AC Induction Motor
        • AC Servo Motor
        • Commutator Motor
        • Oven Fan Motor
        • Shaded Pole Motor
        • Single-phase Asynchronous Motor
        • Vacuum Cleaner Motor
        • Vehicle AC Motor
      • AC Shade Pole Motor
      • External Rotor Motors
      • DC Motors
        • BLDC Motors
        • DC Gear Motor
        • DC Servo motor
      • Motor Controllers
      • Motor Drivers
      • Stepper Motors
      • Vibration Motors
    • HVAC Systems
      • Air Handling Unit
      • Air-Cooled Chiller Heat Pump Unit
      • Central Air Conditioning
        • AHU Plug Fan
        • Belt Driver Centrifugal Fan
        • Centrifugal Impellers
        • Direct Drive Centrifugal Fan
      • Air Source Heat Pump
      • Rooftop Air Conditioner Unit
      • Fan Coil Unit
        • Vertical Fan Coil Unit
      • Rooftop Air Conditioning Unit
      • Water Chiller
    • Air Conditioning
    • Air Conditioner Fan Blade
      • Plastic Axial Fan
      • Plastic Centrifugal Fan
      • Plastic Cross Flow Impeller
      • Mould
    • HVACR Components
      • Air Conditioning Water Pump
      • Carbon Filter
      • Speed Regulator
      • Switch
      • AC Contactor
      • Air Purifier Parts
      • Temperature Controller
    • Roof Exhaust Fan
      • Direct Driven Roof Fans
      • No Power Roof Fans
      • Solar Panel Roof Fans
    • Accessories
      • DC Power Switch
      • Electromagnetic Switch
      • Fan Impeller
      • Potentiometer
      • Thermostat
    • Gas Heater Blower
  • Solutions
    • Residential Ventilation
    • Home Appliance Cooling
    • Commercial HVAC
    • Industrial Dust
    • Cold Chain
    • Battery Energy Storage System
    • Heat Pump
    • Data Center Cooling
    • Fan Grids
  • Industries
    • Ventilation technology
      • Central residential ventilation
      • Decentralized residential ventilation
      • Air purifiers
      • Heat pumps
      • Harvest storerooms
      • Greenhouses
      • Livestock farming
      • Vertical Farming
    • Air conditioning technology
      • AHUs in industrial buildings
      • Air doors and air curtains
      • Heat exchangers and condensers
      • Precision air-conditioning units
      • Condensers
      • Server cooling
      • FFU/EFU
      • Heat pumps
      • Air heaters
      • Cooling towers
      • FanGrids
    • Refrigeration
      • Evaporators
      • Adiabatic cooling
      • Refrigeration and freezer units
      • Bottle coolers/drinks machines
      • Cooling towers
      • Gas and oil
      • Process refrigerating plants
      • Condenser units
    • ICT and the electronics industry
    • Drive technology
      • Automation
      • Medical technology
      • Intralogistics
      • Access control
    • Rail Technology
    • Heating technology
      • Residential gas condensing technology
      • Commercial gas condensing technology
      • Solid-fuel heating technology
      • Heat pumps
      • Gas conventional heating
      • Hybrid systems
      • Oil condensing technology
      • Electrical heating
      • Fuel cells
      • Fan burners
      • Tube radiant heaters
    • Household appliances
      • Commercial dryers
      • Convection ovens
      • Dishwashers
      • Extractor hoods
      • Commercial dishwashers
      • Tunnel ovens
    • Machinery and systems
    • Medical technology
    • Data Center Cooling Solutions
    • Retrofitting fans
  • Resources
    • Calculators & Tools
    • Engineering Guides
    • Cross Reference Guide
    • EC Fan Selection Calculator
    • EC Fan Savings Calculator
    • Buyers’ Guide
    • Use Cases
    • Faqs
    • Projects
    • Technical Articles
  • Newsroom
    • Company & Product News
    • Engineering Case Studies
    • Events & Exhibitions
    • Video Library
  • Company
    • About LONGWELL
    • Memberships
    • Sustainability
    • Social responsibility
    • Milestones
    • Compliance
    • Global Network
  • Support
    • Contact & Support
    • Catalogs & Brochures
    • Certifications
    • Download Center
    • Ordering Policies
      • Sales & Delivery
      • Return Policy
    • Legal Information
      • Terms and Conditions
      • Privacy Policy
      • Intellectual Property
      • Imprint
  • Fan Selector
  • Categories
    • Centrifugal Fans
      • Plug Fan
      • Anti-corrosion Centrifugal Fan
      • FFU Fans & Motors
      • Multi-wing Centrifugal Fan
      • Airfoil Centrifugal Fan
      • Backward Curved Centrifugal Fans
        • AC Fans
        • DC Fans
        • EC Fans
        • EC Plug Fans
      • Centrifugal Blower Fan
      • Forward Curved Centrifugal Fans
        • AC Forward Fans
        • DC Forward Fans
        • EC Forward Fans
      • Industrial Centrifugal Fans
    • Axial Fans
      • Proof Axial Fan
      • Industrial Ceiling Fan
      • Industrial Fans
        • Mist Fan
        • Industrial Wall Fan
        • Powerful Floor Fan
        • Commercial Floor Fan
        • Home Commercial Fan
        • Commercial Stand and Wall Fan
        • Industrial Tripod Stand Fan
      • Condenser Cooling Fans
      • DC Cooling Fan
      • Industrial Axial Blower
      • Internal Rotor Axial Fan
      • AC Axial Fan
      • Axial Compact Fan
      • DC Axial Fan
      • EC Axial Fan
      • Industrial Axial Fans
      • Tube Axial Fan
    • Cross Flow Fan
      • EC Cross Flow Fan
      • Elevator Cross Flow Fan
      • AC Cross Flow Fans
      • Cross Flow Impeller
      • DC Cross Flow Fans
      • Transformer Cooling Cross Flow Fan
    • Duct Fans
      • Anti-corrosion High Speed Air Exchange Duct Fan
      • EC Inline Duct Fans
      • Exhaust Ventilation Fans
      • Metal Duct Fans
        • AC Metal Duct Fans
        • DC Metal Duct Fans
        • EC Metal Duct Fans
      • Mixed Inline Duct Fan
        • AC Mixed Inline Duct Fan
        • EC Mixed Inline Duct Fan
      • Plastic Duct Fans
        • AC Duct Fan
        • EC Duct fans
      • PVC Duct Fan
      • Split Duct Fan
      • Square Duct Fans with Housing
      • Straight Through Duct Fan
      • Super Silent Duct Fans
      • Ceiling Duct Fan
      • Duct Fan Booster
      • Inline Centrifugal Fan
      • Inline Duct Fans
      • Metal Inline Fans
      • Mixed Flow Fans
      • Ultra Silent Duct Fans
    • Blowers
      • Air Movers & Blowers
      • Ventilation Fans and Blower Gather
      • Air Blowers
      • Exhaust Blowers
      • Floor Blowers
      • Gas Blowers
      • Lawn Blowers
    • Exhaust Fan
      • Bathroom Fans
      • Motor-cooling Fan
      • Wall Mounted Exhaust Fan
      • Bathroom Exhaust Fans
      • Industrial Exhaust Fans
      • Poultry Exhaust Fan
      • Wall Exhaust Fan
    • Commercial Fan & Blower
      • DDM Centrifugal Blower
      • AT Centrifugal Blower
      • REM Centrifugal Blower
      • RLM Centrifugal Blower
      • TEM Centrifugal Blower
      • ADH Centrifugal blowers
      • DD Direct Driven Centrifugal Blower
      • RDH Backward Centrifugal Blower
    • Motors & Drive System
      • AC Motors
        • AC Capacitor Motor
        • AC Gear Motor
        • AC Induction Motor
        • AC Servo Motor
        • Commutator Motor
        • Oven Fan Motor
        • Shaded Pole Motor
        • Single-phase Asynchronous Motor
        • Vacuum Cleaner Motor
        • Vehicle AC Motor
      • AC Shade Pole Motor
      • External Rotor Motors
      • DC Motors
        • BLDC Motors
        • DC Gear Motor
        • DC Servo motor
      • Motor Controllers
      • Motor Drivers
      • Stepper Motors
      • Vibration Motors
    • HVAC Systems
      • Air Handling Unit
      • Air-Cooled Chiller Heat Pump Unit
      • Central Air Conditioning
        • AHU Plug Fan
        • Belt Driver Centrifugal Fan
        • Centrifugal Impellers
        • Direct Drive Centrifugal Fan
      • Air Source Heat Pump
      • Rooftop Air Conditioner Unit
      • Fan Coil Unit
        • Vertical Fan Coil Unit
      • Rooftop Air Conditioning Unit
      • Water Chiller
    • Air Conditioning
    • Air Conditioner Fan Blade
      • Plastic Axial Fan
      • Plastic Centrifugal Fan
      • Plastic Cross Flow Impeller
      • Mould
    • HVACR Components
      • Air Conditioning Water Pump
      • Carbon Filter
      • Speed Regulator
      • Switch
      • AC Contactor
      • Air Purifier Parts
      • Temperature Controller
    • Roof Exhaust Fan
      • Direct Driven Roof Fans
      • No Power Roof Fans
      • Solar Panel Roof Fans
    • Accessories
      • DC Power Switch
      • Electromagnetic Switch
      • Fan Impeller
      • Potentiometer
      • Thermostat
    • Gas Heater Blower
  • Solutions
    • Residential Ventilation
    • Home Appliance Cooling
    • Commercial HVAC
    • Industrial Dust
    • Cold Chain
    • Battery Energy Storage System
    • Heat Pump
    • Data Center Cooling
    • Fan Grids
  • Industries
    • Ventilation technology
      • Central residential ventilation
      • Decentralized residential ventilation
      • Air purifiers
      • Heat pumps
      • Harvest storerooms
      • Greenhouses
      • Livestock farming
      • Vertical Farming
    • Air conditioning technology
      • AHUs in industrial buildings
      • Air doors and air curtains
      • Heat exchangers and condensers
      • Precision air-conditioning units
      • Condensers
      • Server cooling
      • FFU/EFU
      • Heat pumps
      • Air heaters
      • Cooling towers
      • FanGrids
    • Refrigeration
      • Evaporators
      • Adiabatic cooling
      • Refrigeration and freezer units
      • Bottle coolers/drinks machines
      • Cooling towers
      • Gas and oil
      • Process refrigerating plants
      • Condenser units
    • ICT and the electronics industry
    • Drive technology
      • Automation
      • Medical technology
      • Intralogistics
      • Access control
    • Rail Technology
    • Heating technology
      • Residential gas condensing technology
      • Commercial gas condensing technology
      • Solid-fuel heating technology
      • Heat pumps
      • Gas conventional heating
      • Hybrid systems
      • Oil condensing technology
      • Electrical heating
      • Fuel cells
      • Fan burners
      • Tube radiant heaters
    • Household appliances
      • Commercial dryers
      • Convection ovens
      • Dishwashers
      • Extractor hoods
      • Commercial dishwashers
      • Tunnel ovens
    • Machinery and systems
    • Medical technology
    • Data Center Cooling Solutions
    • Retrofitting fans
  • Resources
    • Calculators & Tools
    • Engineering Guides
    • Cross Reference Guide
    • EC Fan Selection Calculator
    • EC Fan Savings Calculator
    • Buyers’ Guide
    • Use Cases
    • Faqs
    • Projects
    • Technical Articles
  • Newsroom
    • Company & Product News
    • Engineering Case Studies
    • Events & Exhibitions
    • Video Library
  • Company
    • About LONGWELL
    • Memberships
    • Sustainability
    • Social responsibility
    • Milestones
    • Compliance
    • Global Network
  • Support
    • Contact & Support
    • Catalogs & Brochures
    • Certifications
    • Download Center
    • Ordering Policies
      • Sales & Delivery
      • Return Policy
    • Legal Information
      • Terms and Conditions
      • Privacy Policy
      • Intellectual Property
      • Imprint
  • Fan Selector

← Resources

Engineering & Compliance Knowledge

In-depth technical and regulatory guides for engineers specifying fans — regulation deep-dives, standards explainers and the calculators that go with them.

ErP 2026 Fan ComplianceWhat Regulation (EU) 2024/1834 actually requires — ηmin formulas, the grade-N table, correction factors and a procurement checklist. ErP 2026 Fan Efficiency CalculatorCompute ηmin and the corrected η (Cp/Cc/Cguard) for any fan type and category, with a pass/fail verdict and margin.

🧮 Free calculators for this topic

  • Fan Efficiency Calculator (Static, Total & Wire-to-Air) — Fan static/total efficiency and wire-to-air efficiency from airflow, pressure and measured power — with an FEI-style benchmark.
  • ErP 2026 Fan Efficiency Calculator — Minimum threshold ηmin and corrected efficiency η per (EU) 2024/1834, with pass/fail verdict.
  • Fan Total Cost of Ownership (TCO) Calculator — Lifetime cost of two fan options: purchase price, energy, replacements, maintenance and downtime — side by side.

All 30 fan engineering tools →

longwellfans
To provide best solutions of HVACR
OEM / ODM Design
7*24 hours after-sale service

Company

  • About LONGWELL
  • Contact
  • OEM & Partners
  • Manufacturing & Quality
  • Supplier Cooperation
  • Fan Selector (by duty point)
  • Model datasheets & drawings
  • About LONGWELL
  • Contact
  • OEM & Partners
  • Manufacturing & Quality
  • Supplier Cooperation
  • Fan Selector (by duty point)
  • Model datasheets & drawings

Contact Us

  • No. 100 Henan Road, Ditang, Yuyao, Ningbo, Zhejiang 315400, China
  • +86-18358274663
  • sales@longwellfans.com
  • Склад: Москва
  • Долгопрудный, микрорайон Павельцево, Новое шоссе 38В
  • с 9:00 до 17:00, без обеда
  • Офис/Склад: Ижевск
  • Ижевск, ул. Салютовская, 19, корпус 8
  • с 9:00 до 16:00, без обеда
  • +7 (495) 085-85-90
  • info@longwell-rus.ru
1688
LONGWELL
© 2026 Ningbo Longwell Electric Technology Co., Ltd. All rights reserved.
Facebook X-twitter Linkedin-in Instagram Youtube Tiktok
Contact Us
WhatsApp
Mail to sales

Leave your requirements and our team will respond within 1 business day.

×

Download Our Catalog

Fill in the form — your download starts immediately.

* Your information is only used for catalog delivery and professional support.

Privacy choices

We use optional Google Analytics, Google Ads and Yandex analytics (including session replay on Russian-language pages) to understand visits and enquiries. If you accept, contact information submitted with an enquiry may be normalized and securely hashed by the Google tag to measure the ad that led you here. This choice does not enable personalized advertising. You can reject optional measurement and still use forms, quotations and downloads. Read our privacy notice.