Code for Dryer Venting

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Scuba_Dave

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The back no longer looks like a Cape
Addition on the left
In the middleis the 16x16 sunroom w/wrap around deck
Then to the right (not shown) is a small 7x10 greenhouse against the house
2nd floro has been dormered for more room/Master bedroom

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Cass

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No Ian...You can't invite your self and family over for a dip...
 

Ian Gills

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You're right Cass. In any case, it doesn't look like he has the room. :eek:
 

Cass

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Ha Ha Ha....Maybe if you build Dave a pool house he will give you swimming rights...
 

Scuba_Dave

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Psssst...Ian ....I have a pool :D
One of the main reasons we bought the house
There was a pool cabana that I added onto, now 10'x22' long
Solar water heating system will be on the roof
Plus a 3x10' bar outside - to be finished
This was a few years back when I bought a new filter/pump (now inside)

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Dana

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Actually, I don't see a code issue with dropping down and over. True that heat rises, but air has mass, and can be pumped down more easily than up. Efficiency will not be affected.

Just exactly how you terminate needs to be worked out. You don't want moist air backfeeding into the basement through that window, or collecting in a poorly ventilated space.

A few errors in physical intuition model here...

*Heat doesn't rise, it moves from hot to cold.

*Less-dense fluids rise as denser fluids fall due to gravity. Hot exhaust gas has lower density than cold exhaust gas (or air), and will rise as the denser gas displaces it due to gravitational forces. (The cloud of less dense gas "floats" in the denser gas, rising.)

*It takes more energy, not less, to force a lower density gas downward, counter to the gravitational forces on the denser cool gases that it is displacing. (It's "easier" to pump it up, working with gravity.)

Thought experiment: Take a helium balloon at head height, push it to the floor, what happens? You've forced an equal volume of heavier gas (the air) upward against the force of gravity- that takes energy.

In the dryer vent gas case it's not a huge force if the drop is small, say 3-5', but at 20' you may encounter measurably lower flow (and not just due to duct friction.)

Can't help on the code issue though- no idea.
 
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Hey, wait a minute.

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