Details

How to check the sizes for a replacement 12 inch letterbox:

Open the inside letter plate and measure across the postal slot.

The postal slot through your existing door letterbox can be slightly larger than the sizes shown below (upto 290mm x 55mm max).

12 Inch Letterbox O/A sizes: 305mm x 70mm Fixings @ 275mm centres.

Replacement letterboxes on upvc, or composite doors, is straight forward in many respects as long as you are aware of the basics. The best way to check which size you need, or whether the chosen letterbox will fit, is to take the old one out first and measure the aperture that has been cut through the door. The principle behind a sleeved letterbox is that you can seal off the inside of the door from any kind of ingress, but importantly if you are going to replace the letterbox then you need to be aware of how large the sleeve can be to ensure it then fits through the door aperture.

Fixing your 12 inch letterbox

Our letterboxes have two ports or lugs which accept a self tapped thread from a typical wood screw and usually the aperture through the door is elongated at the end each side for the lugs to go through. This is known as the 'clamp method' and is the best form of fixing. If your existing letterbox is face fixed from each side with four screws then this is still achievable but will require a little bit of diy nouse! All you need to do is slice the plastic ports off the one side of the letterbox with a sharp chisel and then use the pre-moulded fixing positions in each corner. The moulded positions are handy as they make it easier to set a position for fixing but again they will require a little 'spot' through with a drill. If they are not required then you won't even know the markings are there!

Taking care of your 12 inch letterbox

Like everything these days if you look after things they will last a long time and these upvc door letterboxes are no exception. When it comes to the finish of the letter plates then all you need to remember is keep solvents and chemicals of any kind away from the surface. Just use a dry cloth to keep the letterplate clean.