Exhaust BC Roaster

Discuss roast levels and profiles for espresso, equipment for roasting coffee.
blondica73
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#1: Post by blondica73 »

Hello forum members. I have question on the type of material that I need to use for exhausting my BC roaster. Would I be able to get away with galvanized or do I need to use stainless steel for the exhaust pipes?

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SAS
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#2: Post by SAS »

I use aluminum dryer vent pipes; sheet metal and flex tubing. No problems and they clean up easily with soap and water.
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blondica73 (original poster)
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#3: Post by blondica73 (original poster) »

Sounds great.

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jammin
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#4: Post by jammin »

Dryer vent is built to handle a flu gases in the range of 200* F or so. Im always surprised how many people use this for an appliance that commonly has exhaust temps in excess of 400*.

I guess if your full run of vent is visible while roasting, you could feel somewhat OK with Type C vent. Anything bigger than a 1kg roaster though and I'd be skeptical. You sure don't want to penetrate any walls with type C.

Although you truthfully should be using Type L, for a smaller roaster I think Type B vent is a good choice. B vent snaps together as well is easy to install. You really have no good excuse to use something that is not safe or rated for the intended application.

blondica73 (original poster)
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#5: Post by blondica73 (original poster) »

Some of the aluminum semi rigid flex are rated for 400 degrees, at least that's what the sticker on them says. I talked to a contractor and we are looking at installing stainless steel pipes with a designed thru the wall kit I will purchase from home depot (DuraVent Pellet Stove kit is rated for 570 degrees, or DuraVent Plus which is rated for 1000 degrees). I agree that since I have 2k roaster I cannot use simple aluminum tubing. I would have gone with the Pellet stove kit for side wall venting, however, the largest size is only 4 in and I need a 5 in thru the wall, thus I might choose the DuraVent Plus version. I was a little concerned about galvanized steel (Type B) since it might create unhealthy fumes as 400 degrees air passes thru it.

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jammin
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#6: Post by jammin »

^the semi rigid venting you are talking about is flexible B vent. Temp wise I suspect it would nearly suitable. The corrugation would make it a nightmare to clean though.

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FotonDrv
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#7: Post by FotonDrv »

I can put my hands on the flexible venting tubing that came with my 500g roaster. It is 3 inch and is not very hot coming out of the cyclone. Maybe the BC roasters have a higher exhaust temp than the mini500 does so I cannot speak directly to the BC roaster, but just sayin', the pipes on mine are easily touchable.

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blondica73 (original poster)
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#8: Post by blondica73 (original poster) »

FotonDrv wrote:I can put my hands on the flexible venting tubing that came with my 500g roaster. It is 3 inch and is not very hot coming out of the cyclone. Maybe the BC roasters have a higher exhaust temp than the mini500 does so I cannot speak directly to the BC roaster, but just sayin', the pipes on mine are easily touchable.

<image>
What exhaust pipes did you use?

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FotonDrv
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#9: Post by FotonDrv replying to blondica73 »

The ones that came with the roaster.

They cut easily with shears.
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blondica73 (original poster)
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#10: Post by blondica73 (original poster) »

FotonDrv wrote:I can put my hands on the flexible venting tubing that came with my 500g roaster. It is 3 inch and is not very hot coming out of the cyclone. Maybe the BC roasters have a higher exhaust temp than the mini500 does so I cannot speak directly to the BC roaster, but just sayin', the pipes on mine are easily touchable.

<image>
I cannot touch the exhaust pipes towards the end of the roast as they are very hot, granted I run a 2 k roaster (currently I have temp exhaust until the final ones get installed)

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