There may be a vertical part to this vent, leading to the outdoors above ground.
From the timesunion.com
Slugs and snails will chew on tender flower spikes and buds of orchids outdoors.
From the sfgate.com
Love of the outdoors, though, brings enthusiasts back to the Monday Night Skate.
From the sacbee.com
Chard seed can be started outdoors in August in both San Francisco and San Jose.
From the sfgate.com
However, when I do have some spare time I like exercising outdoors and swimming.
From the dailymail.co.uk
Working outdoors can be dangerous and even deadly if you don't take precautions.
From the stltoday.com
Activities for young children to educate them about the wilderness and outdoors.
From the tennessean.com
There's something about the great outdoors that gives you an extra workout kick.
From the kansas.com
To prevent them, adults with contact lenses still must wear sunglasses outdoors.
From the orlandosentinel.com
More examples
Outside: outside a building; "in summer we play outside"
Where the air is unconfined; "he wanted to get outdoors a little"; "the concert was held in the open air"; "camping in the open"
Outdoor(a): located, suited for, or taking place in the open air; "outdoor clothes"; "badminton and other outdoor games"; "a beautiful outdoor setting for the wedding"
(Outdoor) Wilderness or wildland is a natural environment on Earth that has not been significantly modified by human activity. ...
The environment outside of enclosed structures; the natural environment in the open air; Not inside a house or under covered structure; unprotected; in the open air
(outdoor) Situated in, designed to be used in, or carried on in the open air
Outdoor advertising on posters and billboards.
(Outdoor) Billboard and poster locations which advertisers rent to place their creative.