Why is there dirt in my air vents?

Why is there dirt in my air vents?

A

What causes air vents to turn black?

i

How do you get dirt out of air vents?

r

Can you get sick from not cleaning vents house?

Can you get sick from dirty air ducts?

d

Can dirty air ducts cause sinus problems?

u

What is the easiest way to clean vents?

c

Can I clean air vents myself?

t