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Author Topic: Attic Exhausting  (Read 344 times)
bitcoinguy123
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July 26, 2018, 12:56:14 AM
 #21

It’s easy to adjust the temps using the controller that comes with it but it’s mostly made for only higher temperatures since these fans are meant for attic exhaust where it would only cut on when it gets to a set high point...in my case I wanted to constantly pull out the heat and not let it build up so I bypassed it.
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minefarmbuy
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September 01, 2018, 02:44:24 PM
 #22

So I ordered the door louvers since it's cooling down here this seemed like the best place to start. Would hate to go through another season of the door lifted even just a couple inches.

Still trying to talk to manufacturers about demo'ing or wholesale but no one likes to send us stuff lol  . . not that I blame them. I'd just talk about it all day ffs. Only update for now. I'll hope to have pics of the door up in the next couple weeks.

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September 10, 2018, 01:18:06 PM
 #23

I use 8 12v 6000rpm 120MM fans in 2 windows on each end of the room can be done in the attic mounted to ducting and plywood ~2000cfm for 8 and less than 600 watts for all 16

The air they create moves the shrubbery allot 10ft away outside lol  
mgoz
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September 10, 2018, 01:41:37 PM
 #24

If you live where it snows, I'd be concerned with ice damming, mold, and shortening the life of your roof. It's generally a bad idea to exhaust air directly into an attic, especially warm air in the winter. If the plan is to run it all through ducting to an exhaust fan, then you should be OK.
minefarmbuy
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September 10, 2018, 02:48:24 PM
 #25

I use 8 12v 6000rpm 120MM fans in 2 windows on each end of the room can be done in the attic mounted to ducting and plywood ~2000cfm for 8 and less than 600 watts for all 16

The air they create moves the shrubbery allot 10ft away outside lol 

Sounds effective but reducing noise is the reason I'm looking to vent to the attic. Wink

If you live where it snows, I'd be concerned with ice damming, mold, and shortening the life of your roof. It's generally a bad idea to exhaust air directly into an attic, especially warm air in the winter. If the plan is to run it all through ducting to an exhaust fan, then you should be OK.

I live in the NW of the states so I actually have mold issues due to moisture. My inspector said more heat and ventilation will reduce it. In a sense dry it out and air flow. The ice damming maybe an issue. Once winter is here it will be more about retaining heat, as well at night I'll just be letting the heat move into the house or look to figure a way to let it circulate through the HVAC.   

wtfonly16
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September 10, 2018, 06:39:51 PM
Merited by suchmoon (4)
 #26

I use 8 12v 6000rpm 120MM fans in 2 windows on each end of the room can be done in the attic mounted to ducting and plywood ~2000cfm for 8 and less than 600 watts for all 16

The air they create moves the shrubbery allot 10ft away outside lol 

thats pretty bad considering you can get 3300+cfm for 180 watts using a 20inch blower on a single window. 1600rpm low pitch rumble vs screaming server fans...



I live in the NW of the states so I actually have mold issues due to moisture. My inspector said more heat and ventilation will reduce it. In a sense dry it out and air flow. The ice damming maybe an issue. Once winter is here it will be more about retaining heat, as well at night I'll just be letting the heat move into the house or look to figure a way to let it circulate through the HVAC.  

https://www.youtube.com/watch?v=VcRPGQoeO9Q this video describes the winter snow on the roof problem with a hot attic.

ye i aint bares
mgoz
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September 10, 2018, 07:04:44 PM
Merited by frodocooper (3)
 #27

Key components are ventilation and sealing warm air leaks. The temperature of your attic should be the same as outside temperature, but there are a lot of factors that will affect that. One thing that was not mentioned in that video is to not block soffits. In the video it looks like they may have blocked the soffits spraying foam directly into them which pretty much destroys ventilation. You need to have open soffits to let the air in. If using standard roll insulation, there are baffles you can install to allow the air in while still insulating around. I had to install vents all along one side of the roof on a house I purchased about a year ago because they not only blocked with insulation, but also blocked off entirely with a fascia board. Don't know how some people even call themselves roofers or contractors.
minefarmbuy
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September 11, 2018, 02:56:33 AM
 #28

I'll have them come out again to check. All soffits have been opened and 1300 CFM in the gable.

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