Almost Ready. few ? much needed answers

Hi All. Building my 1st cab very soon and their all still a few ?s that I have and am unclear on. 1st off this is what I will be using.

-Easycool 8 inch reflector from HTGS

-8inch inline duct fan from HTGS

-400 watt agromax HPS AND MH conversion bulbs.

-I will be using 8inch ducting

OKAY My ?s

1) Exhuast. I am thinking of running the ducting from the right side of the reflector to the side or top of the cab and cutting a hole there as my exhuast.

2) The inline fan cooling the light. Should it be pushing or pulling the air to the bulb. I am thinking of cutting a hole on the top left side of the cab and attaching it their pushing in air through the ducting to the left side of the reflector, passing through the bulb and out the right side of the reflector to that ducting and out a hole on the right side of the cab.

3) Carbon scrubber...I have NO idea where to place this.

Here is a blueprint minus the ducting and placement of a scrubber and fan. I need help with this. Also there will be a small ocalating fan on the plants hitting them directly for air circulation. Thank you all in advance

put your carbon filter were your exhaust is. (you want fresh air going out, so the air would have to go though the filter before it leaves the room) If you want to cool your fan, have it blow onto the fan, as long as you have good airflow, you will be able to manage your temps fine.. If i understand you correctly, try get the exhaust on the roof (hot air rises) so it would be easy to get it all out..