VIANS VI-S505 100KG Concealed Door Closer – Hydraulic Fire Door Closer with Hold-Open, Adjustable Speed, EN3-4 M-OFT Educational Value: Enhances STEM learning

Educational Value: Enhances STEM learning by combining creativity with basic electronics and programming concepts

Extended Backup Time: Equipped with 2 x 12V 9Ah batteries for longer runtime

100Hz Refresh Rate: Smooth motion and reduced blur

auto video tracking

1X port security to control access to your network

VIANS VI-S505 100KG Concealed Door Closer – Hydraulic Fire Door Closer with Hold-Open, Adjustable Speed, EN3-4 M-OFT Educational Value: Enhances STEM learningThe VIANS VI S505 is a concealed hydraulic door closer designed for heavy doors in commercial and public buildings. Installed inside the door leaf and frame, it offers controlled door closing, improved aesthetics, and reduced risk of vandalism. Product Parameters Model VI S505 Product Name Big Door Closer Lock Size 238 60 40 mm Fix Size 188 19 mm Max Door Weight 40 100 kg Max Door Width 850 1250 mm Max Opening Angle 180 Spring Power EN34 Closing Speed