Hook up a leaf blower.
Birds in exhaust vent.
The vent pipes that the birds infest are usually the upper floor bathroom exhaust vents and dryer vents.
The is the very simple version of the bird in vent removal process a more complex version may be needed to remove the birds from your vent pipes and an on site evaluation is needed as all homes are created differently.
Bang on it with a solid object and the noise will make.
Bird nests in your bathroom vent can also mean that the dust debris and droppings are disturbed and blown into your bathroom every time the fan is turned on.
Signs of a bird stuck in a vent scratching sounds as the bird attempts to escape chirping if the bird is young.
Disconnect the beginning or interior end of the vent from the fan.
If inhaled bird droppings can cause histoplasmosis a serious lung disease.
Birds in vents is a very common problem that is found in most cities and towns on the eastern seaboard birds will start attempting to get into vents usually in the later part of march they will attempt to get into any vent in the home some of the more common vents that you will find birds in are kitchen vents and higher up bathroom vents.