Where I live I find birds like to build nests inside of exhaust vents. If you don't have this problem then you should be OK.

Interesting point, I hadn't thought of that. It turns downwards and could conceivably hold a small bird's nest...

Birds can open the typical dryer 'flapper' style vent without much trouble.
They then build a nest in the duct.

Ok, you've convinced me. This is for the kitchen vent, but same deal I guess.

One thought, though, regard dryer vents which I've been debating...I see lots of models with removable plastic cages, so they should be relatively easy to clean, but what's the trade-off regarding prevention of birds nesting (good) vs people not remembering to clean the cages, which are going to result in a quicker buildup of lint (bad) - in other words, if you can't guarantee a regular clean of the cages, might you be better off leaving them off?

"if you can't guarantee a regular clean of the cages, might you be better off leaving them off?"

Right up to the birds nesting and blocking the line that way.

Houses require maintenance.
If you do no t want to do anything rent.

The landlord adds it to your rent so you do not have to do anything.

I had a tenant once that did not want to have to mow the law on a SF rental.
I said it could be covered by raising the rent.

They decided it was worth mowing.