Barbara <[EMAIL PROTECTED]> queried thusly:
>I am building a laminar flow hood and it occurred to me that there might
>be a difference in efficiency and/or function between vertical and
>horizontal laminar flow. The professional models come both ways. Here's
>my thinking so far. Please feel free to straighten me out on any point.
Used horizontal flow for about 5 years; used vertical flow
for almost ten. A skilled operator who knows better than to put dirty
things between the element and the work can use either with equal
facility. The unskilled operator will find the horizontal flow to be better.
Vertical is nice in that the footprint is substantially
smaller than horizontal.
>to be in working order." Overall cost for this unit without a base
>(which will be a table of some sort) is $850 which includes all shipping
>custom cutting of the 1/2-inch cast acrylic materials.
Fan filter units (FFUs) occasionally pop up on eBay for
about $100- sometimes new-in-box. Skip the acrylic for ducting (if
that's what you're using it for) and use a commercial-grade shower
curtain (hotel supply stuff) for $15. Put it in place with
double-sided tape around the circumference of the filter element.
Make a table out of PVC pipe and slap a cheap piece of impermeable
kitchen countertop material on top for $30. Run a bead of caulking
around the lip to prevent drippage- maybe $10, less if you have the
caulking gun.
I just saved you $695. If you enclose half that amount and
put it in an envelope, consider my consulting bill paid.
Cheers,
-AJHicks
Chandler, AZ
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