HomeRoast Digest


Topic: vent booster fans (8 msgs / 195 lines)
1) From: Rob Lund
Hello, everyone!  New member, long time coffee drinker.
My wife is the family roaster.  We have an IR2 and have been enjoying MANY
good cups of coffee since buying it.
I recently installed a permanent 4" dryer vent so that she could roast
inside the house and vent the smoke outside.  This dryer tube is about 3
feet long or so with 2 90 degree bends.  But I'm finding that the forced air
pressure from the IR2 isn't quite enough to properly vent the smoke out by
itself.
I've looked into getting a dryer vent booster fan, but most of those are
plastic fan blades.  The manufacturer recommended not installing the fan,
since the temperature was so much higher than typical clothes dryers.
I'm wondering if any of you could recommend a better way of boosting this
airflow.  Is there a better way of fixing the vent tube to the iRoast so
there's not so much leakage?
Thanks!
Rob
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2) From: Allon Stern
On Mar 2, 2009, at 1:39 PM, Rob Lund wrote:
<Snip>
This is what I have done:http://www.radioactive.org/pix/roaster/I found that without the fan, there is just too much roast smell/ 
smoke that gets out. Unless I'm very early in the roast (and wanting  
a fast ramp), I make sure to always keep a small bit of fan going to  
help the exhaust to vent. The flexible tube holds on pretty well  
usually, but there have been times when I've needed a potholder to  
keep things from getting out of hand - a better attachment would  
indeed be welcome.
HMMM, how about permanently affixing the "crown" to the chaff  
collector lid? Might affect cleanability, though. Something should be  
possible.
-
allon
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3) From: Sam49
Put the fan at the exit end of the tubing so that it is pulling the air 
out.  By the time that the hot air gets to the blades it isn't very 
likely to be very hot.  Also, set up the intake so that some room 
temperature air is also sucked into the dryer vent tubing, therefore 
cooling the exhaust from the roaster as it enters the tubing.
Sam
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4) From: Michael Dhabolt
Rob,
Both of the previous posts present great ideas.  I use a Poppery with
a glass chimney that is 3 inches in diameter.  I found some slightly
larger than 3 inch flex tubing, similar to the 4 inch dryer exhaust
stuff.  I bought a cheapie bathroom exhaust fan (plastic impeller and
all).  I permanently installed the fan in an exterior wall near my
roasting location and had a local sheet metal guru make a fixture
($15) that fits the hose and fits loosely into the front of the fan
housing when the plastic grill is removed.  The other end of the hose
fits loosely over the roaster chimney allowing room air to mix with
the roaster exhaust (same as Sam49's thoughts).  Sooner or later the
fan will get gunked up and die, this happens for me about every two
years.  If you are judicious about the fan you purchase, the internals
of the fan can be replaced without disturbing the installation (the
whole piece that the fan motor is mounted to clicks out with the help
of a little prying with a screw driver ..... into the trash ..... new
piece with motor and fan ($16) goes in .... the wiring from the fan to
the box even uses a normal two prong 110V plug.  The cheapest of the
fans at Home Depot is also the quietest.
Mike (just plain)
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5) From: g paris
Rob:
Use a small fan at the exit end of your run; it will pull the small amount
of smoke right out.
The same thing applies to greenhouse fans where you want to move air without
blowing your plants.
One fan at the beginning pushing (your roaster fan) the other fan at the
other end pulling the air.
you can use a computer fan if  you want, the little plastic thingsies.
ginny
On Mon, Mar 2, 2009 at 11:39 AM, Rob Lund  wrote:
<Snip>
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6) From: Rob Lund
Mike, this is great info.  Any pictures of your installation online  
somewhere?  How about that Depot part number?  I'm very curious.
ROB LUND // "I solder the body electric"
WEB INFO //  ElectroLund.com // AIM // Yahoo // Facebook
On Mar 2, 2009, at 6:04 PM, homeroast-request 
  wrote:
<Snip>
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7) From: Rob Lund
Thanks, Allon, this was very helpful!  I like the simplicity of your  
setup.  It never occurred to me to use an off-the-shelf DC fan like  
that.  I have lots of access to such equipment, duh!
Thanks!
ROB LUND // "I solder the body electric"
WEB INFO //  ElectroLund.com // AIM // Yahoo // Facebook
On Mar 2, 2009, at 6:04 PM, homeroast-request 
  wrote:
<Snip>
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8) From: Michael Dhabolt
Rob,
One of the few times I didn't document with pictures.  The install
directions were in Chinglish but had drawings and presented well what
was an easy install.  Seems like I remember Loretta pushing the
project (dinner time).  I roast in the kitchen and the initial
installation involved a little sheet rock work. It was a pleasant
surprise when I had to replace the internals to find that it was a 10
minute job that didn't require any disturbance of the fan housing or
wiring.  I made sure that the exhaust pathway from the fan housing to
the exterior fixture was a down hill flow so there wouldn't be any
locations for chaff to build up.
Just looked it up on the Home Depot web site and looks like the price
has come down to about $10 for the whole thing.  The only things
needed for the initial install, other than the fan, was a little piece
of the metal flex hose, couple of hose clamps and an exterior vent
fixture (used a regular dryer fixture).  The fan info from their site
is:
NuTone
ValueTest® Wall/Ceiling Fan
Model 696N
Currently quaffing a 5 oz. Cappa with the triple shot pulled from a
blend of 50% yellow bourbon, 25% IMV and 25% Blue Batak ..... second
so far this morning ..... Mmmmm.
Mike (just plain)
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