Re: substrate heating

>From: William.Keith.Brummett at att_com
>Date: Wed, 19 Apr 1995 14:24:13 -0400 (EDT)
>    Is the actual heating element laying against the plastic backing, then?
>    I thought that the element was supposed to be suspended a half-inch or
>    so above the bottom to facilitate convection currents.

No. Maybe a picture will help.  Here is the elevation:


     o  o  o  o  o  o  o   <--- Clothesline  
     ===================   <--- Clothesline
    ---------------------  <--- Carpet Backing

The plan would look like a grid with the carpet backing under it.  So
the heating coil will be held up off the ground by the thickness of
the clothesline - just under 1/4".

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Date: Wed, 19 Apr 1995 15:39:02 -0400
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Subject:   Aquatic Plants Digest V1 #25
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