Positive or negative draft for my homemade gasifier?

[Redox]

Ok then. Positive draft it is! (I've always been a positive person anyway! )

I'm seriously thinking I'm going to use two of these: http://surpluscenter.com/item.asp?UID=2008060808421424&item=16-1258&catname=electric

Cheap, Hi flow, all metal.... What more could one want?

53 volts DC? What an oddball voltage rating. I'm sure it will run on less, but just wondering what the original application was. It also looks like more of a high flow, low static kinda fan, but what do I know? Let us kow how it goes...

Chris

 

[deerefanatic]

Yah, I noticed the 53 volt rating..... I was just going to run it off a 25-0-25 transformer (50 volts).......

Maybe a forward-curve type fan would be better? Those seem to get pricey in a hurry.... But, they can handle more pressure....

Maybe this one would be better? http://surpluscenter.com/item.asp?UID=2008060808421424&item=16-1279&catname=electric

It's plastic, so I'll need to keep it away from heat.

 

[Redox]

That one might be a brush style motor (?) that may not last long in continuous duty. The first one had some kind of speed controller built in that is probably worth more than the fan costs. I might just order the 53 volt one for fun to check it out! 25 bucks for that seems like a bargain. The second one looks like it puts out about 100 cfm at 2.6 inches which is in the ballpark, I'm guessing, but it uses 300 watts to do it. Not sure exactly what to recommend for your situation.

Chris

 

[deerefanatic]

Hm, yah.... the $25 fan is what I've been eyeing... I'm planning on not using the built in speed control right now because I think it won't let me slow it enough.. Though maybe with the static pressure I need it won't need to be slowed down!