This is the short version: seven checks to run through before you press Buy. Each one links to a longer explanation.
1. Exact specification
Confirm the listing says what you expect: 250mm / 25cm diameter, 250 × 30mm body, 12V DC and a speed controller. Marketplace listings often have several variants, so confirm the one you select.
2. Space and mounting
Measure your space and leave clearance. See 250mm Cooling Fan Singapore: What to Look For Before Buying.
3. Power unit and mains rating
Check the mains input range of the power unit. Singapore is 230V, 50Hz. The listing mentions 110V, 115V, 220V and 230V options, so select the one that suits 230V.
4. Plug type
Singapore uses Type G. The featured product photo shows a flat two-pin plug that will not fit a Singapore socket. Look for a Singapore-suitable plug option or ask the seller. Can You Use a 250mm DC Fan in Singapore?
5. Use case
Match the fan to a job: general airflow, exhaust, or spot cooling. A large fan suits open air movement better than pushing through a dense filter. See How to Choose a Workshop Cooling Fan.
6. Delivered price and timing
Compare the full checkout total, including shipping and any taxes, and check the delivery estimate. See AliExpress Cooling Fan Deals: How to Compare the Real Cost.
7. Returns and support
Read the return and refund terms. For electrical items, check whether you can return a unit that arrives with the wrong plug or does not work.