Collection Box

• A = 80mm, the height of the opening.
• B = 250mm, the width of the opening.
• D = 242mm, the overall depth of the standard size collection box, used for single, double or cavity brick walls. See below for details of sizes for cases to fit deeper walls or piers.
• H = 425mm, the overall height of the collection box.
• W = 295mm, this dimension is the overall width of the collection box.
• X = 286mm, the distance from the bottom of the letterbox casting to the bottom of the letter opening for a single wall depth chute.

Collection Box Sleeve

Shown below are the dimensions of the inner sleeve of the standard size collection box.

• A = 402mm, the distance between the bottom face of the sleeve and the top of the apex, the overall height of the letterbox sleeve is taller as the sides extend below the bottom by 13mm making a total depth of 425mm. These extensions to the sides are generally bedded into the mortar when being built into a brick wall or pier.
• B = 383mm, the distance between the bottom of the sleeve to the top of the side before the apex begins. The apex of the sleeve rises 20mm from the side to the peak in the centre.
• C = 397mm, the dimension of the side of the sleeve from the very bottom to the lower point of the top apex.
• D = 230mm, the depth of the standard size sleeve. See below for details of sizes for cases to fit deeper walls or piers.
• E = 275mm, this is the width of the sleeve.
• F = 13mm, this dimension is the distance between the bottom of the sides and the floor of the mailbox sleeve.

Rear Access Door

Below are the dimensions of the rear access door of the LS10 Stamford rear retrieval postbox.

• A = 180mm, this is the width of the rear retrieval doorway
• B = 185mm, this is the height of the rear door entrance

The diagonal distance of the letterbox opening is 257mm, easily big enough to remove A4 or large packages. A telephone directory sized package can be removed from the letterbox without needing to be bent in any way.