Would anyone know of a place to buy a nice, reliable, low-speed, inexpensive 12 VDC fan, 12-16" in diameter, rated for about 1000 cfm? Something like a 12 V window fan... Auto radiator fans come to mind, but it seems to me that they are high speed and not too efficient. Norman saunders says that the efficiency of a fan is about the same as its diameter in inches... Nick