inline vs duct fans

I am at a similar situation would love to see some comments

A duct fan is actually a type of low performance inline fan. Noise level vary a lot, a value in DB is always indicated on manufacturer package. Duct fan normally emit less noise than a high velocity inline fan & for a small grow space they can do the same job at a lower cost. Using a high velocity inline fan will often require the use of a sound muffler and a variable speed controller.


Duct fan duct fan.jpg High velocity inline fanIn-Line-Fan vortex.jpg

I have 2 435cfm fans for my 2x4x5(ft) tent. One venting the 600w hood and the other pushing fresh air into the tent from outside the garage. I live in Northern CA and the dead of summer has yet to hit but my recorded low is 64, high is 88 and it normally runs around 76-78 during the day. My plants have been thriving on that for over 5 weeks and I have had no issues with my temps, air, or plants. My fans when running full speed (which they always are) are not loud but they are not quiet. My 2 year old daughter constantly thinks the dryer is running in our garage (which is what I would compare it to as well) but she corrects herself and says "Oh, nope! Just daddy's garden!" I cannot offer any input on the duct fan being as I have not used them but I am considering a small one to push air in and use my 435 to pull hot air from the top instead of ushering air in..

If you have lengths of ducting you will need a centrif, if there is little ducting the vent fan should be ok. And the centrif is much louder than a vent fan.

alright thanks guys. i will deffenitly be going with a 4" duct fan. they are alot cheaper and i dont want something as loud as a dryer haha. i wont have any ducting but i will have a carbon filter attached to the fan. and be running a passive intake

i think the term "inline" or inline fan can be misused a bit
it is just about the shape of the blades, and what direction the air is pushed in
the ducting fits on each end of an inline fan so the input and output ducting are "inline with each other" 180 degrees

the fan i am using, is pre-mounted in a metal box to reduce noise, the ducting is attached at right angles 90 degrees , so my fan cant be an "inline fan"
the shape of the blades are pushing the air out at right angles to the input
an inline fan pushes the air to the center in a straight line
you can find diagrams to illustrate this if you want to search for them
the boxed fan i am using removes more air than a standard inline fan with less noise output
mainly due to the size of the fan and motor, the fan has a 6 inch outlet, but is using an 8 inch blade 250 watt motor inside the box

peace

Originally Posted by dank smoker420

alright thanks guys. i will deffenitly be going with a 4" duct fan. they are alot cheaper and i dont want something as loud as a dryer haha. i wont have any ducting but i will have a carbon filter attached to the fan. and be running a passive intake

Unfortunately the use of a carbon filter require that you also use a high velocity fan.....but on the other hand it also cut some of the noise. A 4" high velocity fan couple to a carbon filter would run at a similar noise level than the advantage washroom fan or even more quiet if you go for a high-end one.

i started off with a duct booster, and yes, they're super quiet, but that's only because they're hardly doing any work ime.. mine was a hunk of junk, and in no way would i compare it tot he quality inline fan i have now..
yah, it's way noisier and i have to run it on a speed controller and a duct muffler to make it bearable, but the difference is night and day...