Traditional LetterboxA letterbox is a small door fitted into the top of a uPVC or composite door. It is used to receive mail and other deliveries. The traditional letterbox is usually fitted with a tunnel, brushes and an insulation sleeve to reduce drafts and insolate the door. The From the Anvil Traditional Letterbox comes with a stainless steel tunnel for protecting the door and eliminating the draughts. The door is fitted with brushes on the inside, which reduce air