The trick with the ventilation fan buy indoor use, kitchen and bathroom with three.

The trick with the ventilation fan buy indoor use, kitchen and bathroom with three.
1, bathroom general smaller, about 2-4 square meters, the choice of open-fan 150-200 mm.
2, kitchen options unscreened with 250 mm exhaust fan(kitchen ventilation fans), such as when the kitchen is equipped with a hood off, time to install ventilation fans.
3, bedroom and living room area is generally about 12-16 square meters, with two-way type ventilator 250-300 mm more appropriate.