VELUX Support - Exterior heat protection
How to operate different exterior products with window open and closed
SSL-S and SML-S (frame installed)
- If the window is open, it is not recommended to roll down the shutter, the window should be closed first.
- If the window is open and the shutter is rolled down, the window should be closed before the shutter is rolled up.
SSS-SA, MSL-SA, MML-SA, SSL-K and SML-K (sash installed):
For these products there's no restrictions as the products are installed on the sash.
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