FAN SELECTION GUIDE
How to Select an Equipment Cooling Fan
Choose an equipment cooling fan around the required operating point and the actual installation. A matching size code or a high free-air airflow figure is only a starting point.
1. Define the cooling task
Describe the equipment, heat load, available inlet and exhaust paths, ambient conditions and required operating temperature. Cabinet obstructions, filters and grilles affect airflow. Ask your equipment designer to establish the required airflow and system resistance rather than selecting by a catalogue maximum alone.
2. Choose an airflow arrangement
An axial fan moves air along its axis. A centrifugal fan or blower turns the airflow through its impeller and needs the intended housing or outlet arrangement. A crossflow fan has an elongated outlet layout. These descriptions help identify a mechanical arrangement; compare the actual curves and drawings before deciding which meets your installation.
3. Match the supply and controls
Check the voltage, AC frequency where applicable, running current, input power, starting requirements, connector and wiring. DC and EC descriptions do not guarantee a PWM, 0–10 V or speed-feedback interface. Request the exact pinout and supported control method for the ordered configuration.
4. Read the performance curve correctly
Free-air airflow and maximum static pressure are different endpoints of a performance curve. They are not achieved at the same operating point. Compare a confirmed fan curve with the system resistance curve. The CM catalogue contains pressure-unit inconsistencies, so request the original test sheet and a confirmed unit before converting or designing around a pressure value.
5. Confirm the mechanical fit
Use a current production drawing for outside dimensions, depth, hole spacing, inlet and outlet clearance, airflow direction and cable routing. Catalogue codes such as 8025 are references; do not treat them as a complete verified dimensional drawing. Match guards and filters separately.
6. Check evidence for the ordered configuration
Request noise measurement conditions, bearing and life assumptions, ambient temperature limits, ingress evidence and any required electrical or material certification. A catalogue application label does not establish medical, safety-critical or other regulated suitability. Compare noise only when test methods and conditions are comparable.
What should you send with an enquiry?
Send the BROSNGAN CM reference, supply voltage and frequency, required airflow at pressure, available drawing or mounting envelope, control needs, operating environment, quantity and timing. If replacing a fan, include the existing label and mounting drawing. Availability, configuration and price are confirmed on enquiry.