What are the types of volume dampers ? and what is the limitation for each type?

Volume control – VCD series

Insulated control – ICD series

Air measuring control - AMD series

* Single blade volume damper:

I. Butterfly damper

II. Gate damper.

- some data indicate that it is allowed up too 300 mm.

* Multi blade volume damper:

I. Parallel blades volume damper.

II. Opposed blades volume damper. (preferable)