Birds nest in the spaces between the louvers and the cooling-and-heating units, leaving behind droppings and nesting material. The board says condo owners are responsible for cleaning and removing the nests. The birds that have settled in your building have found an equally logical place to call home, albeit one that is inconvenient for you. He suggested using bird netting or mesh cloth to keep the birds out of the louvers. I’ve written to the condo board advising them of this and asking them to install some sort of railing.

Source: New York Times September 10, 2016 13:52 UTC