ventilation help needed please... pics included

been working on this project for little over a week now. its a 8x6 wooden box thats 7 ft tall.

1000w light
big reflector air cooled 6inch
switchable ballast
some quality mylar
6 inch fan
4x4 tray
not sure of reservoir size

i was told to use 6inch insulated ducting which i will purchase tom hopefully after consulting with you guys first.

my growbox is located inside of another room that has a fan on the ceiling and a vent that is hooked up to the central heating and cooling unit for the home.

i need help setting up my growbox's entire ventilation system.

where do i start my ducting (in my box or outside the box) and where do i want to put my fan and where do i dump the air that i will be taking out of my light/box?.....window is not an option... just the room the box is in or via air vents into other rooms of the house. ?

lastly.... i was told to get a portable ac unit to bring fresh/cool air into the room...

can i use the air vent that i already have inside the room where my growbox is and duct it into the box?

if i were to have a portable ac system would i put it inside my box or outside my box?


sorry if i was not clear on my questions or explanations... im a newb at this and this is my first grow attempt i attached some pictures for you guys to make it easier to see the things im talking about.
 

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