Plastic External Louvre shutters.
These are general use shutters for the outside of premises.
Suitable for all types of fan.
The louvres close when the fan is not in use to stop back drafts.
Available in various sizes.
The size is the size of the ducting that attaches, NOT the overall size which is a little more.
Please note we list these by suitable duct size, not the overall size.
Please refer to the dimensional diagram in the images section.