Varia - Varia T -Varia Lux, the farrnly of chain operalors for bottom-hung. top-hung and dormer windows. Slurdy and inexpensive with a thrust force ranging from 150 to 200 N and a drive force of 300 N. They are available for opération at 230 VAC and at 24 VDC. Ultimate versatility: the stroke can be adjusted from 90 to 400 mm. The best quality/price product available on the market.