Exhaust Dilemma

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philanthropist21

Member
Hello all! Alright...so I've been attempting to finish up construction of my first room, and I have hit a little problem. During the testing of my exhaust fan and attached filter, I noticed that it actually created more heat inside the room than it pulled the warm air out. I have it mounted high in the corner of the room , through an air cooled hood, exhausting out into a different area. I'm using a portable AC unit housed in the opposite corner of the fan/filter. So far my initial solution would to just run the fan a certain amount of time per hour every hour, but that hinders the hood from being constantly cooled. I am wondering if it is possible that the fan is pulling so much air so quickly that it also pulling out the cold air produced by the AC?? When leaving the fan continuously running the room begins to feel very warm and dry. Any thoughts, ideas, or potential problem solvers?
 
Vento

Vento

Well-Known Member
philanthropist21 said:
Some pics to aid hopefully:
View attachment 1095325View attachment 1095326
Click to expand...
Hi ya Phil :)

Welcome to Riu :)

Yupp i can see the problem here ... your sucking air thru the filter into the fan and the fan is blowing that air thru the hood and out thru the other side ?

Try connecting ... Filter >short duct > HOOD > Fan sucking > Outside the room .

For some reason whenever i see air being BLOWN thru a hood i allways think of Fan heaters :)

The debate rages on about sucking and blowing ..the pros and cons of both .... But suckin works for me ...Im a sucker :)
 
HowzerMD

HowzerMD

Well-Known Member
Pulling air is far more efficient than pushing air. Add your blower to the very end of the line like Vento demonstrated.
 
P

philanthropist21

Member
Vento said:
Hi ya Phil :)

Welcome to Riu :)

Yupp i can see the problem here ... your sucking air thru the filter into the fan and the fan is blowing that air thru the hood and out thru the other side ?

Try connecting ... Filter >short duct > HOOD > Fan sucking > Outside the room .

For some reason whenever i see air being BLOWN thru a hood i allways think of Fan heaters :)

The debate rages on about sucking and blowing ..the pros and cons of both .... But suckin works for me ...Im a sucker :)
Click to expand...
I like your idea, that makes good sense to me, but do you think that will help me with my overall temperature problem?
When running all equipment, including lamp and A/C, but not the exhaust fan, the room temperature hovers around 82 degrees Fahrenheit. After plugging in the fan the temperature jumps up the low to mid 90's.
 
BoomerBloomer57

BoomerBloomer57

Well-Known Member
Lot's of sharp eyes in the room tonight,,,

what's up Vento?


HVAC. Ventilation. Cool air in, hot out.

Now lets work on the room venting.

And you will need to vent the heat from the room.

Floor vents opposite of your exhaust vent.

No. Not the light vent.

You need another room exhaust with a good fan.
Place your intake vents as low to or in the floor and draw cool into the room

It'll work.
 
P

philanthropist21

Member
BoomerBloomer57 said:
Lot's of sharp eyes in the room tonight,,,

what's up Vento?


HVAC. Ventilation. Cool air in, hot out.

Now lets work on the room venting.

And you will need to vent the heat from the room.

Floor vents opposite of your exhaust vent.

No. Not the light vent.

You need another room exhaust with a good fan.
Place your intake vents as low to or in the floor and draw cool into the room

It'll work.
Click to expand...
From what you said this is my understanding:
Add another exhaust fan (one for reflector and one solely for exhaust of filter?)
Also adding more intake near the ground

Right track?
 
BoomerBloomer57

BoomerBloomer57

Well-Known Member
Bingo,

I have multiple air inlets in both labs, floors and walls.

Bigger the fan for venting heat the better.

Flower Lab has 1 8" Elicient pulling in the corner of the end of the lab.

Space the floor vent furthest from your room exhaust fan.

I used inert smoke bombs to configure my ventilation.

The smoke tells me everything I need to do to be cool.
 
P

philanthropist21

Member
BoomerBloomer57 said:
Bingo,

I have multiple air inlets in both labs, floors and walls.

Bigger the fan for venting heat the better.

Flower Lab has 1 8" Elicient pulling in the corner of the end of the lab.

Space the floor vent furthest from your room exhaust fan.

I used inert smoke bombs to configure my ventilation.

The smoke tells me everything I need to do to be cool.
Click to expand...
This a very crude diagram of basically what I'm thinking and current location of things:
diagram.jpg
I was thinking of putting the intakes near the portable AC unit.
 
BoomerBloomer57

BoomerBloomer57

Well-Known Member
This is where it's cool to have a twin.

Madds will start by saying, "you know bb, if we",,
and I can visualize in his head what he's looking for
in the end results.

So,

Keep your fresh air intakes as far and as low from exhaust fan and Port A/C as you can.

No need to filter, just screen em.
 
F

fred flintstoned

Well-Known Member
Since you have an AC unit, why vent at all? A good fan cooling the lights combined with the AC unit should solve your heat problems. Venting conditioned air seems such a waste.
Of course, you'll need to inject CO2 with this setup. A tank, regulator and timer are pretty cheap.
A dehummer might be a good idea too.
Fred
 
BoomerBloomer57

BoomerBloomer57

Well-Known Member
No one here is venting A/C'd air.

why pay for A/C if you can ventilate effectively?

I run my Labs without A/C as a rule.

Should it get to be a southern california scorcher and the inside temps break 90f
guess what?

The A/C kicks in.

3 of em.

I pay enough for lights. HVAC. The V stands for Ventilating.

Co2? Yep. Got it.

A dehumider?

I don't need one.

Hell I run a Vortex heater at night with lights on just to keep the labs above 80f.

Cool Waters,
No Light.

bb57
 
1mikej

1mikej

Well-Known Member
it looks to me in those pics that the filter/exhaust is in the same room as you light and you getting your fresh air from outside the grow room. if this is the case that could be the problem. you creating possitive pressure in your room. this causes 2 problems. 1st the possitive pressure makes it harder for ac to push its cold air into room. 2nd your displacing the chilled air with the hot air from lights. i cool my lights by sucking in air from a source outside of my grow room and it vents outside my home. if you do it this way you wont need the filter becuase the air cooling lights wont mix with air in the grow room
 
F

fred flintstoned

Well-Known Member
The dude is absolutely venting conditioned air. Read the posts

I'm using a portable AC unit housed in the opposite corner of the fan/filter. So far my initial solution would to just run the fan a certain amount of time per hour every hour, but that hinders the hood from being constantly cooled. I am wondering if it is possible that the fan is pulling so much air so quickly that it also pulling out the cold air produced by the AC?? When leaving the fan continuously running the room begins to feel very warm and dry. Any thoughts, ideas, or potential problem solvers?

When running all equipment, including lamp and A/C, but not the exhaust fan, the room temperature hovers around 82 degrees Fahrenheit. After plugging in the fan the temperature jumps up the low to mid 90's.

Now look at the diagram. The exhaust fan is pulling conditioned air.

This a very crude diagram of basically what I'm thinking and current location of things:

I was thinking of putting the intakes near the portable AC unit.

Your advice to run another fan circuit, 1 for lights, 1 for exhaust makes perfect sense.In this scenario the AC is used as an emergency back up only. Again, perfect sense.
I was suggesting philanthropist consider an alternative. Sealed room.
Fred
 
kingofqueen

kingofqueen

Well-Known Member
I,m gonna say that yeah sucking is more efficent than pushing the the air thats common knowlage on here .Are u running that fan at full speed ?Is it on a timer ? U may be not allowing for the ac to have an chance and it doesnt matter if your pushing or pulling the air out if tha ac never has a chance to fill the room with cold air .you should try putting a timer on your exhaust ,and your ac so that when the fan is off the ac is on and it has a chance to cool the room instead of being exhausted out constantly.I have the same problem on hot days i load my room with frozen 1 gallon jugs . But if i dont cycle my exhaust it doesnt do shit .If i cycle i get a cooling effect of 4 degrees.

Peace !
 
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