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Choosing a French Door Threshold Replacement Thresholds are required to fill in gaps that are uneven at the bottom of doors and protect you from all seasons of bugs, draughts and water. A lowered threshold is safer for wheelchairs, pushchairs/prams and can also link indoor and outdoor spaces more effectively. When advising on the options for their french door thresholds it is important to understand the different options that are available. Weathered The threshold of an exterior door is an important feature o