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Hottop Rear Filter Option.
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Dmorcos
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Posted Tue Dec 10, 2013, 12:57pm
Subject: Hottop Rear Filter Option.
 

I know that computer fan stainless filters have been used. Has anyone tried the Stainless screen like in window screen? And can someone see a downside to that ?
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frcn
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Posted Tue Dec 10, 2013, 1:47pm
Subject: Re: Hottop Rear Filter Option.
 

It should work just fine. it will flow more air than the stock filter so you need to compensate either by controlling the fan speed or blocking a portion of it with a suitable material (heavy duty aluminum foil should work just fine for that).

 
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Dmorcos
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Dmorcos
Joined: 17 Oct 2005
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Location: Arkansas
Expertise: I love coffee

Grinder: Mazzer SJ
Vac Pot: Bodum Columbia- Royal...
Roaster: Hottop, GC, Behmor, FR8
Posted Tue Dec 10, 2013, 2:58pm
Subject: Re: Hottop Rear Filter Option.
 

Thanks. So you are saying mesh too large and a finer screen would be closer in restriction properties to original filter?
Also, what is the actual size of the filter?
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frcn
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frcn
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Location: Northern California
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Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Tue Dec 10, 2013, 3:12pm
Subject: Re: Hottop Rear Filter Option.
 

The filter on the rear of the Hottop is the same as for a 120mm computer fan- 120mm x 120mm.
it is not a matter of just mesh but of airflow. The computer fans are very free-flowing. Depending on the screen you get it might lose too much heat at a given fan speed compared to the stock filter. You need to compensate by either covering some of the screen's area or slowing the fan speed.

 
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Dmorcos
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Dmorcos
Joined: 17 Oct 2005
Posts: 102
Location: Arkansas
Expertise: I love coffee

Grinder: Mazzer SJ
Vac Pot: Bodum Columbia- Royal...
Roaster: Hottop, GC, Behmor, FR8
Posted Tue Dec 10, 2013, 5:52pm
Subject: Re: Hottop Rear Filter Option.
 

Can either the Aluminum or Stainless screens be used? Thanks again.
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rmongiovi
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Posted Tue Dec 10, 2013, 9:04pm
Subject: Re: Hottop Rear Filter Option.
 

I make my own replacements.  I have a bunch of leftover fiberglass batting from insulating my attic.  I cut out an appropriately size square of it and peel off a decent thickness.  I cut a piece of aluminum window screen to put on one side of the plastic case to prevent fiberglass from being blown out of the filter when the fan is on.  Whenever the fiberglass gets gunked up enough I peel off a new bit of batting and replace what's in the case.

It seems to work fine.  I haven't noticed my roasts taking longer so I presume it isn't flowing too much air.
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frcn
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frcn
Joined: 23 Dec 2001
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Location: Northern California
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Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Tue Dec 10, 2013, 10:17pm
Subject: Re: Hottop Rear Filter Option.
 

If you examine the stock filter the plastic is two pieces. Snap it apart, remove the stock material, and put the screen in between and snap the plastic back together. it works with the computer filters if you flatten the countersink corners with a pair of pliers.

 
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DavecUK
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Posted Wed Dec 11, 2013, 6:40pm
Subject: Re: Hottop Rear Filter Option.
 

Use a cooker hood grease filter cut to size, the paper ones with the red striped. They have the same airflow as the Hottop one, with the added bonus of not being highly flammable. I have friends who have used them for years.
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