fourtwentychat
Well-Known Member
4" Can fan or 4" Booster Duct fan to go with 4" carbon filter?
I've decided that a 4" fan would be best for a very small setup, which would only have to deal with some minor CFL heat in an area of about 2' x 3' x 4'. So, ignoring heat in this discussion:
a) How much of a noise difference will there be between a 4" duct fan and a 4" can fan? In both cases, it would be the 4" filter -> ~ 1 foot ducting -> fan -> ~1 foot ducting...that is, there may or may not be about 1 foot of duct work on both sides of the fan (at most), which is probably insignificant.
Noise (and odor) is most important, so if a 4" inferior duct fan will make much less noise than a can fan and can adequately pull through a 4" carbon filter to eliminate odor, then this is perfect.
I know with the 4" can fan, there is the option of a speed controller, but I've read that speed controllers can cause cheaper inline fans to hum substantially. Since this would be a cheap HTG fan, a speed controller will be avoided, even if the 4" can fan is the only option.
*Note: Since heat is not an issue, exhausting will be done "scrubber" style, instead of outside the room. Also, there is a video in htg's "mother tent" page, that shows them using a 4" duct fan in their tent (but not attached to a filter as it was only their "mother tent" making the filter unnecessary. All they did was slide a 4" duct fan directly into the 4" flange that lead air to the outside of the tent. So really, I'm wondering if a 4" carbon filter with at most 1 foot ducting leading to the 4" Duct booster fan that is connected directly to a flange leading to outside (as in the video) would be enough?
b) I'm sure the 4" can style fan will adequately pull air through the 4" filter, but will a 4" duct style fan also be able to pull enough air through the filter to completely eliminate external odor compltely in an area of only about 2' x 3' x 4' or 24 cf?
I've decided that a 4" fan would be best for a very small setup, which would only have to deal with some minor CFL heat in an area of about 2' x 3' x 4'. So, ignoring heat in this discussion:
a) How much of a noise difference will there be between a 4" duct fan and a 4" can fan? In both cases, it would be the 4" filter -> ~ 1 foot ducting -> fan -> ~1 foot ducting...that is, there may or may not be about 1 foot of duct work on both sides of the fan (at most), which is probably insignificant.
Noise (and odor) is most important, so if a 4" inferior duct fan will make much less noise than a can fan and can adequately pull through a 4" carbon filter to eliminate odor, then this is perfect.
I know with the 4" can fan, there is the option of a speed controller, but I've read that speed controllers can cause cheaper inline fans to hum substantially. Since this would be a cheap HTG fan, a speed controller will be avoided, even if the 4" can fan is the only option.
*Note: Since heat is not an issue, exhausting will be done "scrubber" style, instead of outside the room. Also, there is a video in htg's "mother tent" page, that shows them using a 4" duct fan in their tent (but not attached to a filter as it was only their "mother tent" making the filter unnecessary. All they did was slide a 4" duct fan directly into the 4" flange that lead air to the outside of the tent. So really, I'm wondering if a 4" carbon filter with at most 1 foot ducting leading to the 4" Duct booster fan that is connected directly to a flange leading to outside (as in the video) would be enough?
b) I'm sure the 4" can style fan will adequately pull air through the 4" filter, but will a 4" duct style fan also be able to pull enough air through the filter to completely eliminate external odor compltely in an area of only about 2' x 3' x 4' or 24 cf?
