Carbon Filter to HPS to exhaust fan placement question

Hello Everyone!

As the title vaguely implies - I am trying to figure out the best placement for a carbon filter, 600 or 1000 air cooled HPS and exhaust fan.

The room is 6 1/2 feet long, 4 1/2 feet deep, by 7 feet tall. My original idea was to place the carbon filter on the rear end of the system - directly before exiting outside. From exiting the room to exiting the house will be under 4 feet - rough estimate of a 10 1/2 to 11 foot system.

I have seen a couple set ups where they actually have the filter as the first section of the system - pulling hot air at the top, down and across the light, out the room and then outside/other room. Doesn't that kind of defeat the purpose of the carbon to a certain degree since you are pulling clean air across the bulb, which is contaminating the air ( fractions of % I understand ) then out? If this is the preferred method tho - I can see how having the filter stationary near the top of the room would be better for cooling. Maybe I am missing a step in the scrubbing method?

I have also read that it is better to pull air rather than push it - would an exhaust fan near the end of the system be more beneficial rather than in the middle of the system?

Sorry for the newbie questions - just want to give my future girls the best climate possible : )

Thank you in advance,
Hornchen
Semper Fi

Hello,

I placed my Carbon filter hanging from the ceiling so as to remove hot air (no need for air cooled lamp) and to give me more grow space on the floor.

Just my 2 cents.

Good call! Didn't even think of no air cooled lamp - that makes life so much easier.

I would say the same for the filter to fan and out. If you still want to cool the light run another duct with a small inline fan pulling cool air from outside your room and vent it outside your room. The only reason to cool your hood is to remove the heat from the room. I have heard it can also extend the life of your bulb. The carbon filter scrubs the smell from the air before venting it.

Push through your hoods to cool. If you pull through them and there is any leaks its going to pull un filtered air with it and defeat the purpose of the carbon filter.

Always put your extractor at opposite end to your inlet otherwise your ext fan wil just suck up all the clean cool air as it comes in.
Keep your ducting to an absolute minimum if you want to keep the efficiency of your fans.
Don't scrimp on jubilee clips and use tape, the glue will soften and you will get leaks.
No need for an inlet fan in most cases uness you have a huge ext fan, passive inlet is usualy adequate.
Do fit a fan control, it wil be your best friend in winter to control temps.

Just a few pointers, hope they help

thanks again for all the help and great info!

I think I am going to run a non-air cooled HPS with the full carbon filter/exhaust fan system separate and running as close to the ceiling as possible. Can't wait to get my journal started when construction actually starts!