It has been a time since last post in this project. As per options for increasing the air ventilation inside the dome we decided to go with installing a grid powered exhaust fan to increase the draft in the dome.
For this function i chose a 15 Inch 160 Watt 230 V AC Almonard Exhaust fan. I tinkered a way to install it at the apex of my dome where my previous outlet hole existed.

