In the debris were some cast skins from carpet beetle larvae but no live house beetles.
Carpet beetles in kitchen cabinets.
They can also be brought in by way of cut plants and flowers.
These nocturnal insects prefer to hide in places such as storage containers crevices of furniture and behind kitchen shelves.
Some live inside the nests of birds or other animals and can live in walls or chimneys.
Warehouse beetles trogoderma variable and larger cabinet beetles trogoderma inclusum are two of several household pests that are closely related to carpet beetles coleoptera.
Carpet beetles can also thrive on lint hair and debris accumulating under baseboards and inside floor vents and ducts.
Warehouse and cabinet beetles are a nuisance to insect collectors around the world because they infest boxes of stored dried insects and reduce them to collections of dust and insect parts.
The pests can also proliferate on bird nests animal carcasses and dead insects cluster flies lady beetles stink bugs wasps etc which tend to be associated with attics chimneys basements and light fixtures.
Adult carpet beetles can live both indoors and out but females prefer to lay eggs where larval food sources are abundant.
I removed the vent cover and felt around inside the duct and pulled out handfuls of debris including lots of pet hair that had accumulated there.
In most cases pest management professionals refer to these beetles simply as trogoderma beetles or use the term warehouse or cabinet beetles.
Carpet beetles are grouped and named according to their feeding habits which are varied carpet beetles black carpet beetles furniture carpet beetles and common carpet beetles.