Overview
Closed shutters reduce incoming light, but they are not a sealed blackout system. Working clearances remain around blades, panels and frame edges. Plan a separate blockout layer if the room needs stronger darkening.
Why small light gaps remain
Small clearances are needed for blades and panels to move. Light can enter around those edges and meeting points, so a shutter should not be treated as a sealed blackout system.
How to improve light reduction
Correct frame choice and careful panel alignment help avoid unnecessary gaps. Check the opening and frame overlap before ordering, then adjust the installation so the panels close evenly.
When true blackout matters
For stronger room darkening, consider a suitable blockout layer in addition to shutters. Plan the space for both products and check edge coverage before deciding on the combination.
