Contact Us We are a team of engineers and thinkers who care about the air we breathe. Address Dhanmondi Office: Aprt # C-1, House # 35, Road # 28 (Old), 15 (New), Dhanmondi R/A, Dhaka-1209, Bangladesh+88 01955560400,+88 01955560401,+8801955560402wellis@oss.com.bd Connect Facebook-f Linkedin Youtube Please enable JavaScript in your browser to complete this form.Name *FirstLastEmail *Subject *MessageCommentSubmit Our Location