The portable ventilating system of the invention includes a base adapted
for being towed behind a prime mover, ground engaging apparatus for
supporting the base frame in a manner permitting movement of the base over
the ground, a fan assembly mounted on the base and having an impeller for
creating an air flow, and power transfer apparatus for rotating the
impeller of the fan assembly. The power transfer apparatus is connectable
to and drivable by a power take off apparatus of the prime mover.
