how do I flip all normals in a box?

[Jeay]

Hi guys, Im trying to follow this tuturial but I dont know how to flip all polygon's normals.

link to tuturial:
http://www.cgarchitect.com/resources/tutorials/smoke3d/tutorial13.asp
numberr 2.

can anyone explain how to do this?

by the way: Ayone know of any tuturials about modeling&texturing houses and rooms?

[DeadlyFreeze]

Just apply a normal modifier to your object.

[Emperor]

Or if you want to do it without having to add a modifier+ collapse then select all faces in polygon mode and find this button....

"FLIP"