Intake question- fancy diagram included

So pictured above is my current setup for cooling my lights. I'd like to add an intake to help cool the room down further but I'm not sure where I should put it.

I plan to just put a tee where the intake will be and put a filter on the open end of the tee. This way I can still cool my lights and can add more fresh air without adding another fan.

My question is would it be more efficient if I put the tee before or after the fan? I'm afraid that if I put it before the fan, it will suck air in from the room instead of push air into it. This would be really bad because I would be dumping dirty air outside and stink up the 'hood.

The other thing is that both fans have 8"to6" reducers on them that go to the 6" duct that goes outside. I could only find a 6" tee so it would be nice if I could place it before the fan and just hook it to the reducer. If I put it after Ill have to get two more reducers(which would probably be the same price as a 8" tee if I could find one) but if it's my only option I don't really mind.

Any help would be great guys. Thanks in advance

anyone ?? I'd like to do this today and the lights go off soon so if someone could chime in soon thatd be great!

What if I put the tee before the 8" fan and then hooked a 6" onto the tee pulling air into the room?

is there a problem running to fans with different strengths more or less next to eachother?

This would be really easy for me to do but I would prefer not to if possible!

cool and exhaust without loosing air power

I actually have a separate exhaust and intake, this a closed circuit for cooling my lights only. Maybe I misunderstood what you were saying but that seems like a traditional set up for 1 light...

Crispy Bacon said:

View attachment 2936708 So pictured above is my current setup for cooling my lights. I'd like to add an intake to help cool the room down further but I'm not sure where I should put it. I plan to just put a tee where the intake will be and put a filter on the open end of the tee. This way I can still cool my lights and can add more fresh air without adding another fan. My question is would it be more efficient if I put the tee before or after the fan? I'm afraid that if I put it before the fan, it will suck air in from the room instead of push air into it. This would be really bad because I would be dumping dirty air outside and stink up the 'hood. The other thing is that both fans have 8"to6" reducers on them that go to the 6" duct that goes outside. I could only find a 6" tee so it would be nice if I could place it before the fan and just hook it to the reducer. If I put it after Ill have to get two more reducers(which would probably be the same price as a 8" tee if I could find one) but if it's my only option I don't really mind. Any help would be great guys. Thanks in advance

Click to expand...

"I'm afraid that if I put it before the fan, it will suck air in from the room instead of push air into it. This would be really bad because I would be dumping dirty air outside and stink up the 'hood. " Any air you "push" into the room forces an equal amount of air out.

Red1966 said:

"I'm afraid that if I put it before the fan, it will suck air in from the room instead of push air into it. This would be really bad because I would be dumping dirty air outside and stink up the 'hood. " Any air you "push" into the room forces an equal amount of air out.

Click to expand...

Im not sure I understand what youre saying. I already have an 8" exhaust and a 6" intake, wouldn't that mean that my room has an overall negative pressure? If that were the case, would adding this intake really make the room pressure positive(not sure if its as simple as adding and subtracting)?

Even so, I'm not sure if that really pertains to my question. I'm asking if I put the hole before the fan, wouldn't it suck air in from outside AND the room and then pump that through the lights, and then eventually outside? That is the scenario im trying to avoid

Not sure if this is a case of negative/positive pressure or not. I think I may try putting it after the fan, just seems more logical even though it will be more costly. Will report back after I guess...

Also just realized this will work because when the fans aren't running(they only run 12/12), and the exhaust is(24/7), it will just work as a passive intake which may lower nighttime temps, but some kind of heat source is on the list anyways.

Still would like any insight on this whole deal, may even hold off on this until it gets warmer(temps have been mid 70's). Thanks again guys

Hopefully this will clear up any confusion. This is the intake fan I'm talking about. It doesn't pump air into the room just through the lights. Going to put the 6" tee before that reducer in the pic

figured I can just get a duct cap and cap it when it's not needed? This wouldn't be ideal but beats having the room too hot/too cold I guess

Will report back later

i dont understand, why not just use a regular air intake and take the glass off the light and use the intake from the floor, passivly pulling up through the light (cooling it) up to your exhaust? you get maximum efficiency from your fan with the minimal bends, and on top of that you don't have a lens reducing lumens.

IMO the glass is for when your running co2 in a closed grow and want to put the lights on their own seperate air loop

Don't install before fan. It will have the opposite effect that your looking for. You already answered your own question.

Sent from my SCH-I545

But the smartest is not to mess with your light exhaust and run a new fan to pull cold air in to grow. I completely understand your set up and understand what u were going for. Any addition put into your current set up will reduce pressure going to light and possibly make your light run hotter and that would defeat what u were trying to do cool the room down more right?

Sent from my SCH-I545

Nizza said:

i dont understand, why not just use a regular air intake and take the glass off the light and use the intake from the floor, passivly pulling up through the light (cooling it) up to your exhaust? you get maximum efficiency from your fan with the minimal bends, and on top of that you don't have a lens reducing lumens.

IMO the glass is for when your running co2 in a closed grow and want to put the lights on their own seperate air loop

Click to expand...

Thats exactly what I'm doing. And I already have a 'regular' air intake, I'm trying to avoid cutting ANOTHER(5th) hole and use one of the existing ones. My filter is also not an inline filter so there would be no way to clean the air if its hooked up to my lights UNLESS I have the glass on

As far as lumen loss, far outweighs the benefits IMO. Do you know how many times I would have put my head through a bulb if it werent for that glass? Obviously thats my fault but hey shit happens. I like to avoid hospital visits anyway I can

regardless, for my system a closed loop to cool the lights + independent intake and exhaust is the most effective way IVE found to cool the room...

Appreciate the input though man

alwaysgreen420 said:

But the smartest is not to mess with your light exhaust and run a new fan to pull cold air in to grow. I completely understand your set up and understand what u were going for. Any addition put into your current set up will reduce pressure going to light and possibly make your light run hotter and that would defeat what u were trying to do cool the room down more right?

Sent from my SCH-I545

Click to expand...

Ahhh finally the answer I was looking for! Yes I figured that putting it before the fan would have that effect but like i stated previously it will be much easier this way and I figured Id try it.

Not going to bother anymore though, thanks brother

as far as reducing pressure to the lights, do you really think it would significantly impact the light cooling? Keep in mind I have an 8" exhaust AND an 8" intake on my light-loop.

My logic is that the additional intake will outweigh the possible decrease in light cooling efficiency? It has been <40 here lately!

Cutting a new hole for another intake is actually something I plan to do in the future. It's something my landlord will do for me but he takes forever to do anything(RO hookup, CO2 gas line) so I won't hold my breath!

Don't get me wrong though, he is okay with me doing my thing in his house, so he is the man really

Thanks again for the knowledgable response though man really appreciate it