Fans look interchangeable on a shelf. They are not, and the differences show up in your electricity bill and in how the room actually feels.
Match the sweep to the room
- Up to 70 sq ft (small bedroom, kitchen): 900 mm sweep.
- 70–110 sq ft (standard bedroom): 1200 mm.
- 110–150 sq ft (large bedroom, small hall): 1400 mm.
- Above 150 sq ft: 1400 mm plus, or two fans rather than one large one.
A fan that is too small for the room never feels right, no matter how fast you run it.
What BLDC actually means
A conventional fan motor draws roughly 70–80 watts. A BLDC motor does similar work on about 28–35 watts.
BLDC fans cost more up front. Running several of them for long hours through an Indore summer, the difference usually pays back within a couple of seasons — and then keeps paying.
If a fan runs only occasionally, a conventional motor is perfectly sensible and the extra cost is hard to justify. Tell us how the room is used and we will say which way the maths falls.
Air delivery is the number that matters
Air delivery, measured in cubic metres per minute, tells you how much air the fan actually moves. Two fans with the same sweep can differ noticeably here.
A higher figure at similar wattage means a more efficient fan. It is printed on the box, and it is a better guide than the styling.
Why the cheapest fan is rarely the cheapest
Very low-cost fans tend to use thinner motor windings and lighter bearings. They draw more power for less air, run hotter, and start to hum or wobble sooner.
Over a fan's life, the electricity it uses costs far more than the fan itself. Paying a little more for a better motor is one of the few places where spending more genuinely saves money.