S & P Aluminium Axial Fan Louvre Shutter - PER-CR- 630

External Aluminum Louvre shutters for heavy duty external use..
This is a 630mm version only,
The PER-CR units are different from the PER-CN shutters as they open all together at the same time,
The PER-CN shutter are all individually hinged to open seperatley from the other blades.