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Ducting/Venting question
- Thread starter NEGT1
- Start date
SmokinErb22
Member
Maybe find a wye/tee that's something like 8x6x6 or 10x6x6. That would help not restrict airflow as much.
SmokinErb22
Member
I'd opt for the 10" rather than 8". I was gonna suggest a 12" but I can't find any 12x6x6. Here's one of the 10's, you wont be able to find em at lowes or whatever.
http://www.hydrogalaxy.com/climate-...8&cadevice=c&gclid=CITkqoatlMQCFQwtaQodOGQA3w
Horti source also has them in this size. Can't vouche for either company just showing ya what I mean.
http://www.hydrogalaxy.com/climate-...8&cadevice=c&gclid=CITkqoatlMQCFQwtaQodOGQA3w
Horti source also has them in this size. Can't vouche for either company just showing ya what I mean.
Are you scrubbing the air? If you are I would go with 2 separate lines with scrubbers on the ends. That's if your not scrubbing it first. A 10" run of ductwork does have the ability to move more air than two 6" runs though.
If your not scrubbing it at all, I would go with the two 6" lines that go into a wye that turns into a 10" line. Just out of ease of only having one run of ductwork.(might need a couple adaptors to go from 6" to 10")
If your not scrubbing it at all, I would go with the two 6" lines that go into a wye that turns into a 10" line. Just out of ease of only having one run of ductwork.(might need a couple adaptors to go from 6" to 10")
If exhausting outdoors, nothing gives peace of mind like an inline ozone generator.
Smooth round galvanized duct flows better than accordion style duct.
Bends decrease effective cfm.
Its worth noting that your blower probably outperforms your duct. Money is often better spent on ductwork than more blower cfm / electricity.
Smooth round galvanized duct flows better than accordion style duct.
Bends decrease effective cfm.
Its worth noting that your blower probably outperforms your duct. Money is often better spent on ductwork than more blower cfm / electricity.
Attachments
They can do that. Results depend on total restriction & where the fans are in their performance curve. 8" duct has 50 sq in of cross sectional area, 6" duct has 29 sq in, so using 8" past the Y would have minimal negative effect.
as the folks above mentioned. what you want is called a symmetrical reducing 'wye' or sometimes just a 'Y'. might also be sold as a converging wye, but ive noticed that they are usually referred to as reducing fittings.
your local HD or lowes may or may not carry them... depends on how well stocked their hvac area is.
an engineer will tell you that the area of the two down stream branches should equal the upstream area. if you insist on two 6" ducts, then the upstream should be 8".
why? because the ashrae and SMACNA tables do not list the coefficient values...
these are fairly high loss fittings and should be avoided where you can. buy fittings with long conical reductions and as small of as an angle between the two inlets as is possible.
i know that the wood worker folks are keen on low loss fittings,they sell these amazing super long radius elbows that you just dont see in hvac supply places... my gut tells me that they should also sell some wyes too.
do not for what ever reason buy a bull head type tee... they are utter garbage. highest pressure losses in the buisness. if you seriously cannot find a wye locally, just order one online. it will be worth it trust me on this one.
bull head tees are noisy and just terrible in general... any hvac installer putting in bullhead tees on modern hvac supply trunks is a hack and should be hated.... though i will concede that even the worst designed fitting... if oversized enough will perform well. but these fittings really need turning vanes and there's no excuse for not adding them.
your local HD or lowes may or may not carry them... depends on how well stocked their hvac area is.
an engineer will tell you that the area of the two down stream branches should equal the upstream area. if you insist on two 6" ducts, then the upstream should be 8".
why? because the ashrae and SMACNA tables do not list the coefficient values...
these are fairly high loss fittings and should be avoided where you can. buy fittings with long conical reductions and as small of as an angle between the two inlets as is possible.
i know that the wood worker folks are keen on low loss fittings,they sell these amazing super long radius elbows that you just dont see in hvac supply places... my gut tells me that they should also sell some wyes too.
do not for what ever reason buy a bull head type tee... they are utter garbage. highest pressure losses in the buisness. if you seriously cannot find a wye locally, just order one online. it will be worth it trust me on this one.
bull head tees are noisy and just terrible in general... any hvac installer putting in bullhead tees on modern hvac supply trunks is a hack and should be hated.... though i will concede that even the worst designed fitting... if oversized enough will perform well. but these fittings really need turning vanes and there's no excuse for not adding them.
