Distribution transformers drying oven

we are iraqis company, working in the field of supply and delivery for
machine equipment’s and measurement instrumentation , we have received
requests from our electricity directorates to supply dry oven for distribution
transformer .
the main specification for the oven as following :
1) the rated power for the distribution transformer that we want to dry it up to
1000 kva .
2) the temperature rise up to 150 c .
3) the final outer dimension of oven is (4*3*3) m (l*w*h) .
4) the oven wit