Should I use 2 fans or 1 large one. - Growroom Designs & Equipment - International Cannagraphic Magazine Forums

Fitz carraldo · 01-05-2018, 07:41 PM

I'm setting up my grow any would like opinions and advice...please.

I'll be growing in a 15' X 20' room in the basement, I plan on the grow area being along the short wall... so 4'-5' X 15'.

The lights are 2 1k watt with 6" vented hoods and a twin 400w hood that has no duct connection. I'll most likely be repurposing the 2x 400w to a veg area and replace it with another 1k at some point. It would most likely be a 6" vented hood, same as the others.

I'll be cutting holes for duct in the corner of the room that has a closet on the corresponding wall so everything will stay hidden from the eye.

So the question is should or could I use a 8" or 10" filter fan combo to vent the lights AND give negative pressure/ air freshening? Could the larger fans take being reduced to 6" thru 3 hoods and still move enough air to be effective.

What say you?

Speed of green · 01-06-2018, 01:23 AM

Yes you can still move enough air, depending on the fans capacity and how you have it setup.

The ducts dont like to be "sucked" through, they kink and restrict airflow.

This is my old setup, its 8"... positive pressure from the fan to outside will make sure no smells creep in through your lighs and ductwork. .

troutman · 01-06-2018, 02:04 AM

^^^^^^ That's a very nice set up.

pop_rocks · 01-06-2018, 03:17 AM

*lagunitas
/nods and smiles approvingly

Fitz carraldo · 01-06-2018, 04:40 AM

Yea, lagunitas is some tasty stuff! I bought a magnum of their unlimited editon imperial stout recently....A+ and pretty affordable.

Speed, is that 8" or 10"? What kind of trouble will it cause necking the duct down to 6" repeatedly?

Basically, do you think an 8" would work or should I go 10"?

brown_thumb · 01-06-2018, 05:12 PM

I like redundancy so I would use two fans. If one fails, I'll still have some air exchange.

Speed of green · 01-07-2018, 04:42 AM

i would get one reducer from an 8" fan to the 6" ducting. i dont think going back and forth between 8 and 6 would benefit you.

This system is all 8" i think the fan is like 750cfm.

i think an 8" fan and filter will be fine for a 6" duct. it will flow better than you think.

to attach the ducting to the walls and ceiling i get the big zip ties from Lowes, and loosely zip tie the duct and then screw the tail part of the zip tie to the ceiling or wall.

https://www.lowes.com/pd/Utilitech-1...-Ties/50005758

01-05-2018, 07:41 PM	#1
Fitz carraldo Newbie Join Date: Jan 2018 Location: Midwest Posts: 6	Should I use 2 fans or 1 large one. I'm setting up my grow any would like opinions and advice...please. I'll be growing in a 15' X 20' room in the basement, I plan on the grow area being along the short wall... so 4'-5' X 15'. The lights are 2 1k watt with 6" vented hoods and a twin 400w hood that has no duct connection. I'll most likely be repurposing the 2x 400w to a veg area and replace it with another 1k at some point. It would most likely be a 6" vented hood, same as the others. I'll be cutting holes for duct in the corner of the room that has a closet on the corresponding wall so everything will stay hidden from the eye. So the question is should or could I use a 8" or 10" filter fan combo to vent the lights AND give negative pressure/ air freshening? Could the larger fans take being reduced to 6" thru 3 hoods and still move enough air to be effective. What say you?
	Quote

01-06-2018, 01:23 AM	#2
Speed of green Member Join Date: Feb 2015 Location: SoCal Posts: 627	Yes you can still move enough air, depending on the fans capacity and how you have it setup. The ducts dont like to be "sucked" through, they kink and restrict airflow. This is my old setup, its 8"... positive pressure from the fan to outside will make sure no smells creep in through your lighs and ductwork. .
	Quote 2 members found this post helpful.

01-06-2018, 02:04 AM	#3
troutman Seed Whore Join Date: Dec 2016 Location: In the Fridge Posts: 1,603	^^^^^^ That's a very nice set up. __________________ I just died.
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01-06-2018, 03:17 AM	#4
pop_rocks Senior Member Join Date: Apr 2016 Location: in my empire of dirt Posts: 2,185	*lagunitas /nods and smiles approvingly
	Quote

01-06-2018, 04:40 AM	#5
Fitz carraldo Newbie Join Date: Jan 2018 Location: Midwest Posts: 6	Yea, lagunitas is some tasty stuff! I bought a magnum of their unlimited editon imperial stout recently....A+ and pretty affordable. Speed, is that 8" or 10"? What kind of trouble will it cause necking the duct down to 6" repeatedly? Basically, do you think an 8" would work or should I go 10"?
	Quote

01-06-2018, 05:12 PM	#6
brown_thumb Senior Member Join Date: Jun 2016 Posts: 2,094	I like redundancy so I would use two fans. If one fails, I'll still have some air exchange.
	Quote

01-07-2018, 04:42 AM	#7
Speed of green Member Join Date: Feb 2015 Location: SoCal Posts: 627	i would get one reducer from an 8" fan to the 6" ducting. i dont think going back and forth between 8 and 6 would benefit you. This system is all 8" i think the fan is like 750cfm. i think an 8" fan and filter will be fine for a 6" duct. it will flow better than you think. to attach the ducting to the walls and ceiling i get the big zip ties from Lowes, and loosely zip tie the duct and then screw the tail part of the zip tie to the ceiling or wall. https://www.lowes.com/pd/Utilitech-1...-Ties/50005758
	Quote