thanks for the great suggestions! Will speak to the archi. to check if the bars can be reduced in numbers.One suggestion from his end was to cover these bars by using cement fibre sheets that have the look n feel of wooden texture but I am not sure of the end result.Any other material that can be used to enhance the look?

Wooden windows can work in hot and humid climates in India if treated and maintained properly. Wood offers excellent insulation and aesthetic appeal, but it’s prone to moisture damage, warping, and termites. Opt for seasoned or engineered wood with protective coatings to resist humidity. Regular maintenance, like sealing and polishing, is essential. While charming and versatile, wooden windows require effort, making UPVC or aluminum alternatives with wood finishes worth considering for easier upkeep.

Pawan, The function you are describing is of a Awning Window. Yes , you can still have an exhaust. You need to get an opening cut according to size of your exhaust and mount it on the top part. You have described it as being made of cardboard. It doesn't look like a cardboard though. If it is indeed a cardboard then mounting an exhaust on it may not be durable. Use UPVC or Alum composite sheet. Changing the top part to Awning may still be feasible. But you will need some local help. Thanks, Nitin Cornerstone Designs, Bangalore.

but I am concern about weather effects, design facade in south west direction, durability of aluminium section is worthy or not?