fan help

[captez]

I want to know what fan's you are using? I would like to use a cheap fan for a 47 cu ft oven.
how about a Motor,1/40 HP,3.3 In - 3.3 Inch Diameter Motors - HVAC Motors - Motors : Grainger Industrial Supply

[Grumple]

high temp blower : Grainger Industrial Supply

Probably the lowest CFM one would do fine. I use a 76 CFM (1TDU9) for my 4x4x7.5 oven and it works fine.
Grumple

[captez]

that is over 2x the size of my oven

[Grumple]

Originally Posted by captez

that is over 2x the size of my oven

That just means it will move 76 cubic feet of air per minute. As long as it doesn't blow the powder off off the parts it would cause no problem. I don't turn on my blower right away and you could wait till the powder flows. Or you could make the outlet into a multi-nozzle etc to change the SP (static pressure) and maybe slow down or redirect into a certain pattern. I just suggested that blower as it is a "high temp" design. The one you picked would need a fan blade and an extension shaft and you would want to make sure the heat doesn't transfer through the shaft and heat up and destroy the bearings. Other people will chime in here too hopefully...

[streak07]

You can also buy a variable control similar to a light dimmer. You can pick them up at a Lowes or Home Depot, just make sure the amp rating is capable of handling the load of the fan. This will allow you to adjust the fan speed and reduce cfm.
Similar to this guy
http://www.acehardwaresuperstore.com...38.html?ref=42

[GAWnCA]

I picked this one up from Grainger. High Temperature Blower,115 Volt,227 CFM - Small Centrifugal Blowers - Blowers - HVACR : Grainger Industrial Supply The price seemed right, but maybe the temp handling is too low.

[CarWiz]

Keep in mind that the published CFM for fans is normally at .000" SP. SP stands for Static Pressure. Zero inches of water column is like running the fan in open air, basically. When you add ducting or mount the fan so that it must push air somewhere, the SP goes up and the CFM drops. So don't go entirely by the quoted CFM of a fan. In an oven where you probably have a couple of right angles in ducting or small ducting, the CFM can drop by 50% quickly.

[GAWnCA]

Originally Posted by CarWiz

Keep in mind that the published CFM for fans is normally at .000" SP. SP stands for Static Pressure. Zero inches of water column is like running the fan in open air, basically. When you add ducting or mount the fan so that it must push air somewhere, the SP goes up and the CFM drops. So don't go entirely by the quoted CFM of a fan. In an oven where you probably have a couple of right angles in ducting or small ducting, the CFM can drop by 50% quickly.

So if I put 2 90* angles in the 3" range for a total of maybe 7 feet, will the fan above be adequate?

[CarWiz]

Originally Posted by GAWnCA

So if I put 2 90* angles in the 3" range for a total of maybe 7 feet, will the fan above be adequate?

I would think so GAW. The specs on your fan seem adequate. I don't think many folks care for such detail as long as it moves air and the oven works to their satisfaction. The only way to know for sure is to measure the pressure at/near the fan outlet with the ducting in place. The tool might cost more than your fan though. I'd say go with it.

[GAWnCA]

Thanks CarWiz. I guess all I really need it for is to keep the heat evened out. I don't think a whirlwind is required.