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The EPA suggest as well that homeowners maintain an environment below 60% of
humidity to inhibit the growth of mold and mildew in their basements.
Natural method
Natural ventilation makes use of natural air currents, but this type of ventilation
works only for basements with windows that are strategically placed and able to
open and close. While the natural method conserves energy.
Its does require more work. Windows must be opened at regular intervals and
closed during times of rainfall, high outside humidity level, or at night because of
the air features change over from dusk to dawn. For best results, window should be
opposite each other across the basement space, following the dras of the
basement.
If the basement is continuously wet, the natural method is most likely insuicient,
and a more mechanical system may be required.
Mechanical method
Mechanical ventilation uses fans and vents to exhaust existing basement air and
bring in fresh air. The simple but not very eicient type may be placing small
window fans in opposite windows or as technical as installing an exhaust fan with
ventilation pipe to bring outside fresh air.