Would 2 of these in-line blowers in series increase my fume extraction CFM?

[AuggieDog]

I use a blower like the one below. They are cheap, last fairly long, and are easy to source. When one goes bad it's no big deal to change it out for a new one. Can someone smarter than me (all of you) tell me if I put two in series, will it increase (or double) the amount of suction in my fume hood? I have a direct suction into a vertical pipe (was the best I can do) but currently, one fan is just a little bit inadequate. This may seem like a no brainer to most people, but I don't want to start modifying my system until I am sure.
Thanks for your help

 

[FrugalRefiner]

I use a blower like the one below. They are cheap, last fairly long, and are easy to source. When one goes bad it's no big deal to change it out for a new one. Can someone smarter than me (all of you) tell me if I put two in series, will it increase (or double) the amount of suction in my fume hood?

No. It's not that I'm smarter than you, just that I was exposed to this stuff in an old career. Adding another fan inline (I assume that's what you mean by in series) might increase the flow somewhat, but not by a lot, and definitely not double the amount.

Now, you could add a second exhaust system, just like the first system, with separate exit to the outdoors, and you might come close to doubling the amount of gas moved through your hood. It would probably be a bit less than double due to restrictions on make up air. But if you want to increase gas flow by doubling up on the fans, run them in parallel instead of in series.

Dave

 

[AuggieDog]

No. It's not that I'm smarter than you, just that I was exposed to this stuff in an old career. Adding another fan inline (I assume that's what you mean by in series) might increase the flow somewhat, but not by a lot, and definitely not double the amount.

Now, you could add a second exhaust system, just like the first system, with separate exit to the outdoors, and you might come close to doubling the amount of gas moved through your hood. It would probably be a bit less than double due to restrictions on make up air. But if you want to increase gas flow by doubling up on the fans, run them in parallel instead of in series.

Dave

Ok smarty pants
I had a feeling this was this case. Adding a second fan in parallel is quite a bit more involved in my situation. Back to the drawing board, as they say