Thanks is correct. Geo got it right. You didnt, HeatMan. You might
want to look up the definitions for venturi and aspiration.
Venturi is a tube with a taper.
Aspiration will happen in a conventional system although very very
little. A high velocity system like space-pak or Unico relies soley on
aspiration. Thats why they almost dont care where the return grille
gets put and it doesnt need a return in each room to work. Try that
with a conventional system. It wont work well at all.
Bubba

On Wed, 12 Jan 2005 12:57:02 -0500, "HeatMan"
wrote:

Thanks, Geo.

"geoman" wrote in message
...

"Bubba" wrote in message
...
On Tue, 11 Jan 2005 17:39:59 -0500, "HeatMan"
wrote:


"Sennin" wrote in message
groups.com...
venturi effect? What is that?

I don't know last service. I moved in 2 years ago. I had a home
inspection done and it seemed ok.


Despite what Bubba thinks, there is a Venturi effect. While I'd suggest
a
google search, I'll try.

The naturally dusty air in your house will be moving around by air
currents.
These currents will take the dusty air and blow it harder near the
vents.
This may cause the dust to become attached to the registers and the
nearby
walls.

An annual servicing and cleaning, if necessary, is a good idea.


HeatMan,
Read what you are typing. You are explain the snake oil bull****.
While there is a word Venturi, and it is an actual and real effect,
the way you are explaining it and applying it to a heating system is
boloney. Surely you can come up with a better explaination than that.
Bubba :-)

I hate to jump into such a good argument, but the Venturi effect ( a
better term is aspiration") is real around registers and ducts. It is
covered in RSES heating courses and ASHRAE. Some call it "aspiration" ""
a
drawing of something in, out, up, or through by or as if by suction:""

I have seen systems that use hepa filters and the ducts are spotless but
around the discharge register on the ceiling there are patterns of dust
with
discoloration. What happens is the register blows and mix's with the air
by
actually 'aspirating' the room air with supply air.


Okay, so I wasn't using the correct term.
Rich