Crossflow Fan Design Benefits for Slim Profile HVAC and Air Curtain Applications
What Is a Crossflow Fan and How Does It Work?
A crossflow fan (also called a tangential fan or through-flow fan) generates airflow that passes through the fan rotor twice—entering radially from one side and exiting radially from the opposite side, with the airflow direction perpendicular to the fan's rotational axis. This unique geometry produces a wide, flat, laminar airflow sheet—ideal for applications requiring long, thin, uniform airflow distribution. Cooltron manufactures crossflow fans from 60mm to 1000mm in length. Visit https://www.cooltron.com/
Key Advantages of Crossflow Fan Design
Crossflow fans offer a distinctive set of benefits over axial and centrifugal alternatives:
✓ Very thin profile – fan depth is a fraction of its length, enabling ultra-slim product designs
✓ Uniform airflow distribution – consistent velocity across the entire outlet width
✓ Low noise at given airflow – large airflow area means lower air velocity and less turbulence noise
✓ Simple integration – no inlet/outlet duct required; mounts flush with product housing
✓ Wide outlet aspect ratio – typical length:depth ratios of 5:1 to 20:1
Primary Applications of Crossflow Fans
Crossflow fans excel in applications requiring wide, uniform airflow:
Air curtains (air doors) – commercial entrance air barriers preventing heat/cold exchange
Fan coil units (FCUs) – slim HVAC units for offices and hotel rooms
Air purifiers – wide-front filter-to-air purifiers with laminar outflow
Flat panel displays – cooling large LCD/LED screens with uniform temperature distribution
Copy machines and printers – wide paper path cooling without hot spots
Laser cutting machines – fume extraction across wide work areas
Refrigerator evaporators – slim profiles fitting standard European refrigerator cavities
Cooltron Crossflow Fan Technical Specifications
Cooltron's crossflow fan product line:
Rotor diameter: 40mm, 50mm, 60mm, 80mm standard; custom available
Rotor length: 60mm to 1000mm; multi-section designs for longer spans
Operating voltage: 5V–24V DC; 110V/220V AC
Motor position: end-drive or mid-drive configurations
Airflow direction: horizontal or vertical, reversible
Temperature range: -10°C to +70°C (standard); high-temperature variants to +120°C
Designing with Crossflow Fans: Key Considerations
Successful crossflow fan integration requires careful housing design:
Inlet chamber geometry – the vortex chamber upstream of the rotor strongly affects performance
Rear guide wall curvature – the stabilizer wall controls vortex position and pressure generation
Outlet nozzle angle – determines airflow discharge angle (typically 45°–70° from horizontal)
Housing material – must be rigid to prevent vibration amplification across the fan's length
Thermal management of motor – end-mounted motor in long configurations requires heat path design
Cooltron provides housing design guidelines and CFD modeling support for OEM crossflow fan integrations.
Custom Crossflow Fan Solutions from Cooltron
Cooltron's custom crossflow fan capabilities:
Rotor length from 60mm to 1000mm in single-piece or modular sections
Custom blade count and blade angle for target P-Q performance
Special end-caps with built-in motor support brackets
Conformal coating for humid environments (FCUs, evaporators)
UL 507 certified fan motors for North American HVAC market compliance
Request a crossflow fan design consultation at https://www.cooltron.com/