Help making Surface Urgent !!!!
 

Hi All ;
If anyone help me to make surface on two sides of model described in the picture .

this is the result when selecting curves to make surface !

You are trying to loft, that works if the curves are roughly parallel. It tries to connect each curve in the series...

What you need is Create surface from 2 to 4 curves... You actually have more, but they are planar so it can figure it out.

If the first attempt fails, it may give a large untrimmed surface. Just run build topology and it will trim that surface. Then you can delete the outer portion.

Another option is to just create a surface (2 to 4 curves from the inlet and outlet side curves... Then trim out the two small squares (using build topo and then delete).

I try to make surface but still one problem as described below in figure.

Odd, you could either fill that in with another surface, or you could try my second suggestion and stretch a surface from one side of the box to the other (just using 2 curves) and then build topo and cut out the small boxes...