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| Safety -- Make sure you are safe! |
2012-09-25, 12:14pm
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Queen Bee
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Join Date: Oct 26, 2008
Location: Ellington, CT
Posts: 1,253
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Air Flow 1150 CFM Fan Review?
Is anyone familiar with this fan? http://www.aftproducts.com/Centrifug...-1150-CFM.item versus the Vortex fan http://www.residential-lights.com/vo...nline-fan.html besides price?
I'm wondering which fan to buy - I'm also getting the variable speed switch so I can fine tune the air flow in my barley box. I want to be sure I get a good inline fan.....
Dale has graciously helped me with my CFM requirements, etc based upon the size of my box, so I'm all set there - just need to choose a fan 
Thanks in advance!
Donna
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Donna
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2012-09-25, 2:30pm
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Alaska Boro
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Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,065
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One specification that is a good guide to fan performance is fan static pressure. A fan at 0 SP will always look good. But when in use the SP is greater than zero due to vent length, turns, etc.
For comparison one can look at .5 SP and see what the CFM is at that level. Then make your choice based on data.
As an example a TD-315 fan is rated at 1050 CFM at 0 SP, 932 CFM at .25 SP and 770 CFM at .5 SP.
Overall, IMO if the SP operational performance range is not listed then it is a fan that should not be under consideration.
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2012-09-26, 8:14am
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Queen Bee
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Join Date: Oct 26, 2008
Location: Ellington, CT
Posts: 1,253
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Well, now I'm totally confused. The only place I find that lists SP values for inline fans is Grainger - and I'm not getting how to figure out SP. My duct work is 10 ft with 1 - 90 degree bend. My barley box is 30 in by 42 in. Seems I need a huge fan? Like 1100 cfm before deducting the loss from the duct work? Maybe it would be better to ditch the box and just use a small hood?
Where does one find this TD-315 fan?
I am truly ready to jump off a bridge at this point. I am obviously the most dense person in the world when it comes to figuring this out - aaarg!
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Donna
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2012-09-26, 1:47pm
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Alaska Boro
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Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,065
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See the links listed under "Questions about using a hood fan for ventilation" in the Safety section for some additional hints.
The TD-315 fan is made by Soler & Palau.
Using their TD-250 model for my Barley box which requires between 330 and 413 CFM on low speed with an auto transformer (Power Stat - Variac) for speed control. The fan is two speed and has a removable motor that does not require vent pipe to be removed if replacement is required. It is the 10 inch model. These are not inexpensive units but like the all metal construction for this model. Plus ten inch duct is avaialble at both Home Depot and Lowes.
A smaller CFM fan could be used provided that the size of the box is decreased to stay in line with ventilation requirements.
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2012-09-26, 2:00pm
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Queen Bee
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Join Date: Oct 26, 2008
Location: Ellington, CT
Posts: 1,253
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I ordered a fan with 906 cfm, which should be fine. Dale has again walked me through the bumps in the road I was having - my duct work is only 10 ft so static isn't a big concern. Thanks for your help
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Donna
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2012-09-26, 6:11pm
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Alaska Boro
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Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,065
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Be sure to post a picture of the installation when completed.
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2012-10-02, 12:22pm
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No Longer an LE Member
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Join Date: Sep 12, 2012
Posts: 20
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Quote:
Originally Posted by BeadBlossoms
I ordered a fan with 906 cfm, which should be fine. Dale has again walked me through the bumps in the road I was having - my duct work is only 10 ft so static isn't a big concern. Thanks for your help |
10 feet with six 90 turns creates quite the static pressure. Also use rigid ducting over flex yadda yadda yadda.
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