laundry exhaust

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electricmanscott said:
Why would you need to open a window to do laundry?
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I take it you either live alone.... or don't wear socks! Moisture is not the only thing associated with laundry, especially if you only do it once a week.
 
grant said:
I know years ago we had to install exhaust fans in the laundry to meed FHA lending requirements. It really had nothing to do the the NEC. In our area most laundrys have exhaust fans since no one likes leaving a window open during the winter.
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Where does the air come from to exhaust?:confused:
 
Air??

Air??

ohm said:
Where does the air come from to exhaust?:confused:
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The same place the air comes from that lets your fireplace and the burners on your stove burn, and allows you to inhale. If you find a place that air tight let me know what kind of seal they have at the bottom of the exterior doors, I could use some.
 
grant said:
The same place the air comes from that lets your fireplace and the burners on your stove burn, and allows you to inhale. If you find a place that air tight let me know what kind of seal they have at the bottom of the exterior doors, I could use some.
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Could it come from an open window?:wink:
 
I've noticed that most commercial buildings include a fresh-air intake into the return of the HVAC system. That makes up for all of the various exhaust systems, and presents a slight positive pressure inside the buildings.

That minimizes air infiltration and reduces the intake of unconditioned air when doors are opened, etc. I've asked more than one HVAC guy why we don't do the same thing in homes. They've all said it was a great idea, but nobody does it.

It seems that, with all of the air exhaust systems (bath and kitchen fans, furnaces and chimneys, clothes dryers, etc.), it would be better to have fresh air mixed with the return air and conditioned, than leak in around doors and windows.
 
The only thing I can readily find is the standard IRC requirement that dryers be vented to the outdoors.

From the 2006 IRC.......M1502.1 General. Dryer exhaust systems shall be independent of all other systems, and shall convey moisture to the outdoors.

Exception: This section shall not apply to listed and labeled condensing (ductless) clothes dryers.

Unless there is a local requirement, there is NO requirement for laundry room ducting.

With reference to radon venting, this is normally done with 3" pvcpipe ducted to the rood from under the slab. No fan unit is installed unless radon is an issue. There is, however, a requirement of power being accessible in the attic so that if a fan is needed, it has there is available power to run it. (Per my conversation with out local head building inspector.)

c2500
 
LarryFine said:
I've noticed that most commercial buildings include a fresh-air intake into the return of the HVAC system. That makes up for all of the various exhaust systems, and presents a slight positive pressure inside the buildings.

That minimizes air infiltration and reduces the intake of unconditioned air when doors are opened, etc. I've asked more than one HVAC guy why we don't do the same thing in homes. They've all said it was a great idea, but nobody does it.

It seems that, with all of the air exhaust systems (bath and kitchen fans, furnaces and chimneys, clothes dryers, etc.), it would be better to have fresh air mixed with the return air and conditioned, than leak in around doors and windows.
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Larry,

They are doing this in homes. Especially homes that have spray foam insulation or our built exceptionally tight. Trane has a neat system that transfer the heat/coolness to the fresh air and minimizes the heat/cool transfer to the outside. If the home is excessively tight, the pollutant levels indoors can easily exceed the level found outdoors.

The biggest obstacle will be price. If someone is spring for higher end equipment, or they have opted for a tight home, you will find fresh air equipment installed.

c2500
 
grant said:
The same place the air comes from that lets your fireplace and the burners on your stove burn, and allows you to inhale. If you find a place that air tight let me know what kind of seal they have at the bottom of the exterior doors, I could use some.
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Grant,

Move to SC with a huge wad of cash, and I can build you a house that is so tight....I will get censored if I continue with the saying. If you have heard of "Sick House Syndrome" it is usually caused by a house being to air tight.

c2500
 
In oregon

In oregon

Hi, In oregon you are required to have a fan in all laundry rooms and bathrooms, if you don't have an openable window, after july1st, in a bathroom with a shower it must be on a humidistat. not a sp switch anymore...
It is in our building codes though.
kyla
 
c2500 said:
Trane has a neat system that transfer the heat/coolness to the fresh air and minimizes the heat/cool transfer to the outside.
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That's not really new. It's called an air-to-air heat exchanger.
 
LarryFine said:
That's not really new. It's called an air-to-air heat exchanger.
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Well according to the Trane, it is the best and newest thing since sliced bread :D Sadly, it is priced like the bread factory.

c2500
 
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