Drill the holes about 4 cm deep. When all holes are already pre-drilled, clean the window with anti-static fabric and anti-static cleaner and substitute it using the duct tape. Tilt and switch windows open up inwards to permit flexible air flow. Using a tilt switch window you won't need to https://balloon-dog43210.widblog.com/81675405/the-definitive-guide-to-secondary-glazing-installation