Possibilities:
* A car vac runs on DC. The larger the volume of air the more powerful motor it needs, drawing several Amperes. Probably a deluxe model which specifies large Ampere draw and a tendency to overheat if run longer than a few minutes.
* Radio control airplane enthusiasts have a wide choice of store-bought electric motors based on how much power they draw. Suitable for operating several minutes. Tolerant of various supply voltages and propeller size.
* Homebrew wind tunnel projects. Designed to move a high mass of air quickly.