TOO MANY WHIRLY BIRDS ON ONE ROOF

While driving back from Ipoh to Sitiawan, I spotted the roof of one shop house with a lot of whirly bird vents.  Whirly birds are actually roof ventilation with turbine vents.  What they do is to draw fresh air into the roof cavity and draw them out.
So, is it considered good to have so many Whirly Birds to circulate the Qi?  Not really.  Why?  Firstly the flow of the Qi circulating in the house would be overwhelming.  Secondly, the placement of so many vents all over the roof would  produce a lot of unwanted Feng Shui problems.  A ventilator in the centre of the roof would indicate that the occupants of the house are not able to take full control of their lives.  Placing a vent on the right side would give strength to the white tiger, which is not good.  Placing rows and rows of vents at the same levels would result in internal clash or conflicts within the family.  The best place to place an air vent is on the far left hand side of the roof as this is the location of the Green Dragon.