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The installation plan of door and window anti-fall chains for renovation in old residential areas should be formulated according to the aging situation of doors and windows:

- Material adaptation: For old wooden doors and windows, choose self-tapping screws for fixation to avoid excessive drilling causing frame cracking; for steel doors and windows, use metal drills for drilling, and match with expansion screws to enhance fixation.

- Reinforcement pretreatment: If the door and window frames are loose, decayed (wooden) or rusted (steel), they should be repaired first (such as filling wooden wedges, derusting and painting), and then anti-fall chains should be installed to avoid installing in weak parts.

- Position selection: Priority is given to installing on the frame on the hinge side of the door and window (this position has strong load-bearing capacity), avoiding the edge of the glass (to prevent glass breakage caused by vibration).

- Function adaptation: Old doors and windows have poor airtightness, so anti-fall chains with adjustable length can be selected to balance protection and ventilation needs; if the door and window opening is stuck, lubricate the hinges before installation to avoid excessive force on the anti-fall chain.

- Overall coordination: If the doors and windows are renovated at the same time (such as painting), anti-fall chains matching the new color can be selected to improve the overall aesthetics.