Air Duct
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The Air Duct is a new block from Block Party on June,12 2015.
It is a Grey Wallpaper.
Recycling 1 of them you get 0-3 gems.
It spawns in random events.
In-game description
''Sneak around in these to find the secret documents. Nobody knows why they build them human-sized!''
Rarity: 15
To grow, splice a Dark Grey Block and a Grey Block