Letter box

Letter Box
A receptacle for the placement and storage of mail.
Letter of Credit ...

Letter Box Lierne A short rib that runs from the one main rib of a vault to another.

Fit draught excluders to outside doors, inside doors, letter boxes, loft hatch, key holes.
Lag hot water pipes to stop heat escaping - especially important for pipes in the loft and under the ground floor floorboards (the latter are often overlooked).

See also: Window, Wall, Light, Doors, Glass