900w (0.9kw, 1.2hp) or greater 12v (13.88-14v) DC motor sought to buy

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I would like to buy 900w (0.9kw, 1.2hp) or greater 12v (13.88-14v) DC motor with a small-medium size foot print.
I intend to install a 12 blade propeller fan to the DC motor and place inline within a 100-110mm (4in+) duct.
The DC motor and fan will push/pull air at a very high rate of flow through the duct.
Please help or direct to someone who can.
Thanks,
Ren