Bathroom (2nd floor) & kitchen (1st floor) vents of 782 & 784, shown as example, complex-wide.

Dryer vent shared by 790-792, flap ajar

Dryer vent shared by 794-796, flap ajar

Dryer vent shared by 212-214, flap ajar

Dryer vent shared by 786-788, flap at rest correctly sealing vent!

Dryer vent 210, no flap or hood

Dryer vent 780, flap ajar

vent guard at Lowe's but Home Depot has a similar item

the vent guard opens for cleaning!