Which lintel?

[Meeja]

I'm planning to build a small store/shed, which will have an opening for double doors which will be 1.2m wide.

Overall dimensions will be 2.5m deep x 1.8m wide x 2.2m height at the lowest point (where the pitched roof meets the wall)

It will be a single skin brick structure, with a couple of double skin pillars to strengthen, and a pitched roof on it covered with tiles.

I imagine that there will be perhaps two or three brick courses above the top of the door frame.

What kind of lintel should I be installing to span the door opening?

I'm thinking something ike this:

http://www.wickes.co.uk/Concrete-Lintel/invt/244004

 

[PrenticeBoyofDerry]

100x150mm section x 1.5 m concrete lintel will do, bed it so the lintel stand up 150mm high, this will add strength.