6" inline fans. What brand is best?

[TribalSeeds]

I was talking about the the temp diff between a 6 inch vortex and a 6 inch S&P. Not a 6 vs 8 inline fan.

Yea, I get it... What Im saying is there is no difference if the 6" fan adequately cools a space, more CFM's arent gonna make it any cooler. Doesnt matter if its 6" or 12"

 

[Kit Kat]

S&P T-D inline fans are what I've used for years they are very quiet and use hardly and power to run them. I have them exhausting and cooling hoods in 5 diff gardens

I've also been using S&P TD Mixvent fans, specifically the 4" and 6" styles. The noise is way way less than the Vortex or other non-mixflow fans and my Phresh carbon scrubber works just fine with it.

I've had a TD-150 now since late 2009 that has had maybe 3-4 days worth of downtime total. I even wired it backwards when I was trying to set it to 'High' mode on this recent grow I'm configuring and it works (even though it DID heat up to almost 160F!!) without any issues.

Love these fans.

 

[Shafto]

They deliver significantly higher static pressure, so you lose less airflow through bends, obstructions and long lengths.

While I agree that mixed flow fans are the better choice for most of our applications over a centrifugal fan, the quoted statement is incorrect.

Axial fans flow the most but have the least ability to overcome static pressure.

Centrifugal deal with static pressure very well but suffer with the volume of flow created.

Mixed flow, or diagonal fans, are in the middle of the two.

Unless you have extremely high static pressure then a mixed flow fan will move more air than a centrifugal. If your system has a low static pressure, such as mounting a fan on a filter standing up in a sealed room for scrubbing only, with no ducting attached, an axial fan is the best candidate, as it will flow the most air for power consumed.

 

[whodare]

While I agree that mixed flow fans are the better choice for most of our applications over a centrifugal fan, the quoted statement is incorrect.

Axial fans flow the most but have the least ability to overcome static pressure.

Centrifugal deal with static pressure very well but suffer with the volume of flow created.

Mixed flow, or diagonal fans, are in the middle of the two.

Unless you have extremely high static pressure then a mixed flow fan will move more air than a centrifugal. If your system has a low static pressure, such as mounting a fan on a filter standing up in a sealed room for scrubbing only, with no ducting attached, an axial fan is the best candidate, as it will flow the most air for power consumed.

axial fans move the most air for the least watts, condition being there is no impediment to the flow.

centrifugal fans are better but due to design they still lack the ability to produce high static pressure.

mixed flow absolutely have the greatest ability to produce high static pressure.

static pressure is the pressure exerted on the duct in all directions...

your example should read;

Unless you have low restriction of flow then a mixed flow fan will move more air than a centrifugal.

If your system has a low resistance, an axial fan is the best candidate as it will flow the most air for power consumed.

mounting a fan on a filter standing up in a sealed room for scrubbing only, with no ducting attached, a centrifugal might be the best option, add ducting though and you might want to consider a mixed flow fan...




http://www.engineeringtoolbox.com/fan-types

 

[rives]

centrifugal fans are better but due to design they still lack the ability to produce high static pressure.

mixed flow absolutely have the greatest ability to produce high static pressure.

Got a link for this? It's always been my understanding that mixed flow were between axial and centrifugal in both design and performance - ie, better static pressure than an axial, with less flow, and less static pressure than a centrifugal, but higher flow.

 

[whodare]

Got a link for this? It's always been my understanding that mixed flow were between axial and centrifugal in both design and performance - ie, better static pressure than an axial, with less flow, and less static pressure than a centrifugal, but higher flow.

mixed flow share characteristics with both axial and centrifugal. high static pressure and large volume respectively. centrifugal fans are comparable to mixed flow.

the inline centrifugal fans though(should have specified this earlier) which is the one most growers are talking about and using, will never compare to the same size mixed flow fan in terms of static pressure.


http://www.senteracontrols.com/english/hvac-knowledge/knowledge-fans.html

Types of fans

Centrifugal fans

A centrifugal fan has an impeller with a number of blades around the periphery, and the impeller rotates in a scroll or volute shaped casing, and it is this casing which identifies the centrifugal fan. As the impeller rotates, air is thrown from the blade tips centrifugally into the volute shaped casing (snail shell) and out through the discharge opening, and at the same time more air is drawn into the 'eye' of the impeller through a central inlet opening in the side of the casing, thus creating a continuous flow of air through the fan impeller and casing. The volute shape of the casing helps to transform some of the velocity pressure of the air leaving the impeller into useful static pressure to overcome resistance to airflow in the ducting system to which the fan is connected. In normal ventilation work, a centrifugal fan would be used for static pressures (system resistances) up to about 750 Pa(=N/m²). A point to note is that the air flow through a centrifugal fan cannot be reversed.

In-Line Centrifugal fans

Instead of using a volute casing to collect the swirling air from a centrifugal impeller, it may be allowed to spin forwards into a concentric annular casing. Guide vanes will then convert the swirl velocity pressure into fan static pressure, and an outlet duct can be fitted in line with the inlet duct as for axial fans. Performance tends to be somewhat inferior to the corresponding volute model, and the chief advantage is avoidance of the transverse bulk and right angle direction change associated with a standard centrifugal fan.

Propeller fans

A propeller fan usually has a curved sheet metal-bladed impeller fitted to the motor spindle, the motor being mounted on a ring for wall fixing, or in a short length of duct for duct fixing. The air is drawn into the impeller in a fairly smooth pattern from all directions, and discharged in a direction approximately parallel to the axis of the fan, but with a helical twist. Its main use is for moving large volumes of air against low system resistances, say up to 65 Pa, and is very popular in ventilation work in diameters from 300mm to 900mm, due to the robust construction and comparatively low price. However, where appearances matter, such as in offices, shops and hotels,this type is not usually acceptable. It can give reversed air flow at reduced volume andpressure by reversing the direction of rotation. The power required to drive this type of impeller continues to increase as the resistance to airflow increases (i.e., an overloading power characteristic), and the motor must have sufficient power to deal with the heaviest load possible at the designed fan speed to prevent it being overloaded.

Mixed Flow fans

A mixed flow fan combines the characteristics of the large volume of air moved by the propeller fan, (axial flow intake), and the higher pressure of the centrifugal fan, (radial flow discharge). This type of fan with its peripheral centrifugal discharge, fits in very well for roofmounting, say over an exhaust duct system serving a tall block of offices or flats. The airflow through the fan cannot be reversed in direction. It will operate against static pressures up to about 750 Pa and has a non-overloading power characteristic.

Axial Flow fans

An axial flow fan is a development of the propeller fan, but is more efficient (70% - 80%) due mainly to the aerofoil section blades and finer clearances between the impeller blade tips and the cylindrical fan casing. It has a non-overloading power characteristic which enables the correct motor horsepower to be used for any particular fan or application without causing a burn-out due to overload.

It is less bulky than a centrifugal fan for the same output and has the advantage of straight-through airflow, but for static pressures higher than about 250 Pa its higher running speed tends to make it noisier than the centrifugal fan unless special precautions are taken. To increase its performance against higher resistances two or more impellers can be used, forming a multi-stage fan, usually with guide vanes or contra-rotating impellers so that the air leaves the last impeller in an axial direction without helical twist, thereby increasing considerably the possible maximum pressure available. The airflow through the non-guide vane fan can easily be reversed by reversing the direction of the rotation of the impeller, but as the aerofoil section of the blades would then be running back to front, i.e., with the trailing edge of the aerofoil leading, the fan output would be reduced by 25% or more.

There are, however, special reversible fans available which give equal volumes in either direction, by arranging alternate blades on the impeller to face in opposite directions, i.e., one correctly fitted for extract and the next for intake, or by having flat blades. These inevitably reduce the output by 15% or more below that of the normal arrangements. Another point worth noting in axial fan application is that concerning hot or moist fumes. For such cases the centrifugal fan can have the advantage of a motor outside the airstream, so that a standard motor can be used.

To overcome this disadvantage in the case of the axial flow fan, it can be made with a bifurcated casing, so that a motor with slightly extended shaft can be mounted outside the airstream, which passes on either side of the motor through the special casing.

 

[Kit Kat]

Got a link for this? It's always been my understanding that mixed flow were between axial and centrifugal in both design and performance - ie, better static pressure than an axial, with less flow, and less static pressure than a centrifugal, but higher flow.

I always liked this picture to give a quick example of the differences. There's also some pretty good information in the S&P product PDF. Also here's another thread I had bookmarked (from 2008) that had a discussion about these fans compared to other with anecdotal stories that may be helpful.

 

[SoulMachete]

S & P's are the shit! super quiet, powerful, and last forever...better than anything you'll find at the hydro store........

 

[rives]

Kit Kat, that was the chart that I had in mind. It shows the centrifugals as having the highest static pressure capability, with higher noise and less volume. In your "anecdotal" link, there are a couple of charts in Bumble Buddy's post that show the S&P mixed vent fans as having less than half the static pressure capabilities of the Fantech centrifugals at equivalent wattages.

 

[Shafto]

Whodare, You've got a bit "mixed" up. Excuse my pun but I couldn't help myself.

The name tells the story. The mixed flow fan mixes the axial and centrifugal properties together to land in the middle of both.

The links you posted support what Rives, Kit Kat, and myself have posted.

If mixed flow fans made the highest pressure, then the turbocharger in my car wouldn't be centrifugal.

 

[Kit Kat]

Kit Kat, that was the chart that I had in mind. It shows the centrifugals as having the highest static pressure capability, with higher noise and less volume. In your "anecdotal" link, there are a couple of charts in Bumble Buddy's post that show the S&P mixed vent fans as having less than half the static pressure capabilities of the Fantech centrifugals at equivalent wattages.

Whoa, you're absolutely right! I had this link labeled all wrong. Going to repost those graphs here just because they're so useful. I've never used a proper centrifugal, so this is a bit eye opening for me.

Here's the S&P, for the 6" TD-150 you get 24 CFM when set to Low, and 131 CFM when set to High with .75" (typical CAN-Filter rating, I believe?)

The Fantech 6" appears to deliver 164 and 329 CFM respectively at .8", that's a huge difference. Glad I'm not trying to pull long lengths or lots of curves on my current set up, the S&P wouldn't be able to deal.

 

[catalyte]

Active Air is good for the price

Vortex's or Max Cans are the best though if money isn't an obstacle...

 

[whodare]

Whodare, You've got a bit "mixed" up. Excuse my pun but I couldn't help myself.

The name tells the story. The mixed flow fan mixes the axial and centrifugal properties together to land in the middle of both.

The links you posted support what Rives, Kit Kat, and myself have posted.

If mixed flow fans made the highest pressure, then the turbocharger in my car wouldn't be centrifugal.

Yes you're right, for the most part.

I clarified in my earlier post, the inline centrifugal won't hang with a mixed flow fan.

So yes centrifugal fans in general produce higher static pressure than a mixed unless it's an inline centrifugal, which is what all the basic vortex and can fans are...

 

[the gnome]

elicent 150B inline is built to last and is very quiet, rated at 309? or 329cfm but feels like its pulling more. $175-$195 avrage price

 

[TribalSeeds]

One thing I just noticed about my 8" Maxfan is that light doesnt pass through it. If you dont want to put bends in your ducts, these fans are pretty sweet.

 

[badmf]

Elicents work best for me. Got em cheap when a new grower changed his mind on growing.

 

[SMOKE-ONE]

Which popular brands make mixed flow fans?

 

[Guest304546]

thank you all for sharin' the love.

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[SMOKE-ONE]

Are Sunleaves "Wind Tunnels",mixed flow,axiel,or regular centifugal?

 

[Kit Kat]

Which popular brands make mixed flow fans?

I use S&P TD-MIXVENT fans and first heard about them on ICMag as quieter alternative to Vortex.

Are Sunleaves "Wind Tunnels",mixed flow,axiel,or regular centifugal?

Regular centrifugal.