Reducers

Used to connect different sized ducting/fans to each other.
 
Reducers
5 to 4
6 to 4
8 to 4
10 to 4
6 to 5
8 to 5
10 to 5
8 to 6
10 to 6
12 to 6
10 to 8
12 to 8
12 to 10