Quiet ventillation? 240 cfm vs 800 cfm @ 1/4 speed?? -- advice please

C

creq2

New Member
I'm thinking about buying a 800cfm vortex fan...
From what i've been looking into I'm going to need about 150-200CFM for cooling, and I was thinking that i could speed control an 800cfm model since they're not that much more (and are rated at 54dBa, the 449cfm are rated at 49dBa)...

I was thinking I could get the 800cfm model and run it with a controller to about 150-200cfm... and this will make it a lot more silent?
Also the bigger ducting (8" vs 6") I figured would make it more quiet a little too?

I don't know this for a fact I've never used them before, that's why I'm looking for advice...

Is there something I should be aware of that i don't know about or anything when tuning down a fan? Like the 800cfm vortex is going to be wayyy too much, but I figure I'd rather pay $20 extra for the model that's 800cfm compared to the 440cfm model so I know it's gonna be enuogh air flow, and so I can tune it down and it'll be quieter than a 449cfm running at half speed?

Sorry I just don't know shiet about these and they cost like $150-200 and I don't want to have that be wasted $ (like a 800cfm fan running at 200cfm..will it have good static pressure or will this seriously compromise its sucking capability for a pass thru a carbon filter?

Thanks I really need some info,
CreQ
 
sparki

sparki

Active Member
creq2 said:
I'm thinking about buying a 800cfm vortex fan...
From what i've been looking into I'm going to need about 150-200CFM for cooling, and I was thinking that i could speed control an 800cfm model since they're not that much more (and are rated at 54dBa, the 449cfm are rated at 49dBa)...

I was thinking I could get the 800cfm model and run it with a controller to about 150-200cfm... and this will make it a lot more silent?
Also the bigger ducting (8" vs 6") I figured would make it more quiet a little too?

I don't know this for a fact I've never used them before, that's why I'm looking for advice...

Is there something I should be aware of that i don't know about or anything when tuning down a fan? Like the 800cfm vortex is going to be wayyy too much, but I figure I'd rather pay $20 extra for the model that's 800cfm compared to the 440cfm model so I know it's gonna be enuogh air flow, and so I can tune it down and it'll be quieter than a 449cfm running at half speed?

Sorry I just don't know shiet about these and they cost like $150-200 and I don't want to have that be wasted $ (like a 800cfm fan running at 200cfm..will it have good static pressure or will this seriously compromise its sucking capability for a pass thru a carbon filter?

Thanks I really need some info,
CreQ
Click to expand...

it depends on your growspace size really, hard to tell if your under of if its overkill. either way a controller is gonna be beneficial, both for noise and energy efficiency
 
C

creq2

New Member
So you'd suggest getting the 747cfm model as opposed to the 480cfm model?
I'm not askin for what'll be sufficient, i figure 200cfm will be about sufficient..

I'm wondering if a 747cfm fan running at about 1/4 speed will be at least as quiet & operate just as good as a 449cfm fan running at half speed..?

Anyone know? Anyone go overkill for their fan by a lot and tune it down? I'm just scared it's gonna hurt the pulling capacity for the carbon filtration, but the reason I am scared of this is because I DONT KNOW hehe, so if anyone DOES i'd really appreciate it..
 
C

creq2

New Member
I'm basically trying to figure out if I'll be happier with a 449cfm model running at 1/2 speed, or a 747cfm model running at 1/4 speed.. and whether or not this will cause Static Pressure problems with a filter =//
I can't seem to find any specific info..
Does anyone know? I'm trying to order this asap (today) heh..
 
sparki

sparki

Active Member
creq2 said:
I'm basically trying to figure out if I'll be happier with a 449cfm model running at 1/2 speed, or a 747cfm model running at 1/4 speed.. and whether or not this will cause Static Pressure problems with a filter =//
I can't seem to find any specific info..
Does anyone know? I'm trying to order this asap (today) heh..
Click to expand...
do the basic math

how are you planning to get any help if you dont tell us the cubic feet of your space?
 
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