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Old 22-08-2019, 12:47 PM
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doug mc
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Cooling my classic cassegrain

Thinking of attaching a small computer fan to the front dust cover on my GSO C.C. Doing it this way with the rear port open should help cool down. What is a good material to use for a dust filter to place on the outside of the fan? Thanks.
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Old 22-08-2019, 02:58 PM
JA
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Thinking of attaching a small computer fan to the front dust cover on my GSO C.C. Doing it this way with the rear port open should help cool down. What is a good material to use for a dust filter to place on the outside of the fan? Thanks.
You could use a couple of layers of filter material used in HVAC systems for homes. Typically white or light grey in colour and 8-10mm thick. Some hardware stores will have it on the roll to buy by the metre.

The image below (from Google) shows how effective it is in trapping dust in a household HVAC system - Take a close look at the top dark grey layer: it is dust with the white filter material below. It's a good advertisement for the benefit of having one in your home as well (usually in the return air).

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Last edited by JA; 22-08-2019 at 03:16 PM.
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Old 22-08-2019, 04:45 PM
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Ukastronomer (Jeremy)
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Thinking of attaching a small computer fan to the front dust cover on my GSO C.C. Doing it this way with the rear port open should help cool down. What is a good material to use for a dust filter to place on the outside of the fan? Thanks.
As long as it blows OUT and not IN with a load of crap and the air coming in from behind is filtered through the eyepiece holder, and to this end I have made them in the past from this GREAT stuff

https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

That slip on and ducct tape, between the circular cutouts, don't laugh, think about it, three layers of fine "Tights", "Stockings" yes......, thin, and the finest make superb fine filters
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Old 24-08-2019, 08:17 AM
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Will hunt for that filter material. Thanks JA.
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