Home appliances
Nearly every fan is sold on design. The two numbers that decide whether a room actually feels cool are sweep size and air delivery in cubic metres per minute.
A few questions about your situation, not about the product.
Answer all 3 questions to see the spec sheet to shop with.
Diameter of the circle the blades cut.
Why it matters
The sweep must match the room, or airflow either misses the corners or feels like a storm.
What to check
Up to 75 sq ft: 900 mm. 75–120 sq ft: 1200 mm. Over 120 sq ft: 1400 mm, or two fans.
Cubic metres of air moved per minute.
Why it matters
This is the actual cooling number; RPM alone tells you nothing about airflow.
What to check
210+ CMM for a 1200 mm fan is good; below 200 feels weak.
Brushless DC motor versus conventional.
Why it matters
BLDC draws around 28–35 W versus 70–80 W, and runs quieter with remote speed control.
What to check
BLDC electronics can fail; check warranty on the motor and the driver separately.
The pipe between ceiling and fan.
Why it matters
Fans need clearance above and around them to breathe; too close to the ceiling kills airflow.
What to check
Aim for blades 8–9 ft above the floor and at least 25 cm below the ceiling.
Metal, ABS or wood, and the tilt angle of each blade.
Why it matters
Pitch drives airflow more than blade count; metal is efficient, ABS resists coastal rust.
What to check
Three well-pitched blades usually outperform five decorative ones.
A BLDC fan costs more but uses roughly a third of the power of a conventional one.
