The right blade size is set by the cooler, not by preference. Fit a blade that’s too big and it hits the cabinet or overloads the motor. Fit one too small and the cooler loses air throw. Here’s how to get it right in five minutes.
How to measure a cooler fan blade
- Measure straight across the blade from the tip of one leaf to the tip of the opposite leaf. On a blade with an odd number of leaves, measure the circle the tips sweep.
- Note the leaf count.
- Check the hub: the shaft diameter and the motor model it sits on.
- Note which way the blade turns when the cooler runs.
With those four facts, you can match a replacement exactly.
Which size for which cooler
| Blade size | Typical cooler | Notes |
|---|---|---|
| 9 inch | Small personal coolers | Compact cabinets, small motors |
| 12 inch | Personal and small room coolers | Common in plastic personal models |
| 16 inch | Room coolers, tower coolers | The most common room-cooler size |
| 17 inch | Climatizer-style coolers | Specific cabinet designs |
| 18 inch | Large room and desert coolers | Most popular desert-cooler size |
| 19 inch | Climatizer-style coolers | Specific cabinet designs |
| 20 inch | Large desert and commercial coolers | Needs a motor sized for it |
16 inch vs 18 inch: the most common question
An 18-inch blade generally moves more air than a 16-inch blade — but only if the cabinet opening and motor are built for it. Never fit an 18-inch blade into a 16-inch cooler. It will foul the cabinet or overload the motor.
And size is not everything. A well-designed 16-inch blade with the right pitch can outperform a poor 18-inch one. That’s why leaf count and pitch matter as much as diameter (see our fan blade buyer’s guide).
Our blades by size
- 9 inch: M-911
- 12 inch: M-1201, M-1203, M-1205
- 16 inch: M-1601, M-1605, M-1606 (Tower), M-1611 (Ultra), M-1621 (Pro), M-1651
- 17 inch: M-1704 (Climatizer)
- 18 inch: M-1801, M-1804 (Exhaust), M-1805, M-1811 (Ultra), M-1814, M-1821 (Pro)
- 19 inch: M-1904 (Climatizer)
- 20 inch: M-2011 (Ultra), M-2051
Example spec — M-1821 (Pro) 18 inch: 430 mm, 5 leaves, 50 mm pitch, high-grade ABS, fits 32 mm shafts on 110 dia motors, 20 pieces per box. See the full range of air cooler fan blades.
What decides an 18 inch cooler blade’s price?
Price lists online vary a lot, and the cheapest blade is rarely the cheapest over a season. Five things drive the price:
- Material — virgin high-grade ABS costs more than recycled plastic, and holds shape far better in summer heat.
- Weight and wall thickness — a heavier, thicker leaf resists flexing and cracking.
- Design — leaf count, pitch and profile (Pro, Ultra, Exhaust) change the mould and the material used.
- Balance and finish — blades checked for balance cost more to make and save motors.
- Order volume and packing — bulk orders and boxed packing bring the unit price down.
We don’t publish prices because they depend on your model and volume. Send your requirement and we’ll quote.
Frequently asked questions
Which blade is best for an air cooler?
The one built for your cabinet size and motor. For most desert coolers that’s an 18-inch blade; for most room coolers, 16 inch.
Can I put an 18 inch blade in a 16 inch cooler?
No. It will hit the cabinet or overload the motor. Always match the original size.
How do I know my cooler blade size?
Measure tip to tip across the blade, or check the size moulded on the hub.
Does a bigger blade cool more?
It moves more air if the motor and cabinet are built for it. Cooling also depends on wet pads and a working pump.
Buying blades in bulk?
We make blades from 9 to 20 inch in our Delhi units. Ask for the full spec sheet and a quote.
