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Old 10-05-2009, 07:56 AM   #1
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6" booster fan in 7" duct???


Hi Folks,

I live in a 120 year old Victorian that's tall and skinny. Trying to boost cool air flow to the third floor which is served by two 7" supply lines (supplies and return are reasonably balanced). Our HVAC guy said in line fans might be worth a try. I've since discovered that they only come in 6" and 8" diameters, and that there are no off-the-shelf reducers between 6"-7" or 7"-8". The closest thing is 8"-6".

I have a 6" booster fan that I'd like to try out. I don't have the skill to hand-fab a 6"-7" reducer, but it occurred to me that I might be able to nest the fan inside the 7" pipe, as long as I can come up with a good way to secure it, and as long as the attachments (and electrical cable) don't add too much friction (though I think a 7"-6" reducing coupling would be worse on airflow - if I could hand fab a coupling, I think I'd go with an 8" fan and an 8"-7" reducer).

Is this worth a try? Any other suggestions?

Gracias!

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Old 10-05-2009, 03:22 PM   #2
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6" booster fan in 7" duct???


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Originally Posted by victorino View Post
Hi Folks,

I live in a 120 year old Victorian that's tall and skinny. Trying to boost cool air flow to the third floor which is served by two 7" supply lines (supplies and return are reasonably balanced). Our HVAC guy said in line fans might be worth a try. I've since discovered that they only come in 6" and 8" diameters, and that there are no off-the-shelf reducers between 6"-7" or 7"-8". The closest thing is 8"-6".

I have a 6" booster fan that I'd like to try out. I don't have the skill to hand-fab a 6"-7" reducer, but it occurred to me that I might be able to nest the fan inside the 7" pipe, as long as I can come up with a good way to secure it, and as long as the attachments (and electrical cable) don't add too much friction (though I think a 7"-6" reducing coupling would be worse on airflow - if I could hand fab a coupling, I think I'd go with an 8" fan and an 8"-7" reducer).

Is this worth a try? Any other suggestions?

Gracias!
Check http://www.calverleysupply.com/ They should have the reducer 7-6. If not let me know.


Last edited by newtech; 10-05-2009 at 03:26 PM.
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