No one: How many Gigabytes do you have on ducts and vents?
Me: yes

@smokified: I know. But that's what happens when you import assets late at night. And by the time I noticed the mistake, they'd already been used in so many buildings, it wasn't worth fixing (they will disappear if I rename them).

It is spelled DUCTS. Not ducks...lol

Thanks

That can only be done in the asset editor. Props placed while playing a city will always be on the ground.

how to put roof assets on roof? THe most of them appears inside the buidling with the anarchy on :(

These are really nice, thanks a lot, I'm gonna be using them a lot on rooftops :)

@Tim The Terrible: Damn, one of them slipped through! I kept spelling "duck" every time I wanted to put "duct" and I guess one slipped through! :P If I do make some air ducks, they will be more duck-shaped than this. :P

@Shroomblaze: Ty for sending me the texture! Made it so much easier to get it right. It also bothered me how the different hvac system didn't really fit together - different colors and different shapes. So you couldn't really fill up a flat roof with them. :)

Great Job on all of these props. I think they are fantastic additions to my hvac system. I know others have created hvacs as well but the lods of those others ones weren't just up to my standard and so I don't subscribe to those ones even though their main models are good. These ducts will give a lot more variety. Thanks

Not sure but I think you mean 'Air Duct' https://en.wikipedia.org/wiki/Duct_(flow)
Although, duck sounds funny too :p