We use the subfloor systemfor heritage considerations  in our 1817 bldg .
Vents about 200 mm from the wall. Fresh air return is in centre stairwell.
We had problems with pictures moving on the wall from vibration of
airstream, no problems with dust as filtres and activated charcoal catches
most of it. During installations, its smart to keep unit running as
construction dust goes down the vents then whooshes out when the unit is
restarted. We dont do that anymore...  We solved our picture movement
problem with vanes in the vents that direct the air away from the wall. We
havent noticed any other ill effects but Id guess that unless youve got
serious filtres, youll get more dust along the wall.

Michael Bogle
Hyde Park Barracks Museum
Sydney Australia

>Dear Charles,  Again, anyone with museum HVAC questions should contact Bill
>Lull, Garrison and Lull in Princeton, NJ.  He and his firm is the best, most
>knowledgeable, affordable.  Tell him we referred you.  Cheers!  Geri Thomas,
>Thomas & Hirsch, 146 West 28th Street, NYC, 10001.
>-----Original Message-----
>From: Charles Gruchy <[log in to unmask]>
>Newsgroups: bit.listserv.museum-l
>To: [log in to unmask] <[log in to unmask]>
>Date: Monday, November 22, 1999 1:52 PM
>Subject: Re: Air conditioning/heating vents - advice needed
>
>
>>Hi:
>>I have no experience with vents placed that way, but a couple of thoughts
>>leap to mind.  Will there be dust raised (pun intended) by the air coming
>up
>>from the floor, given that dirt/dust will inevitably get into the ducts
>from
>>the floor?  Will it be possible to push the cold air up enough to displace
>>warm air at the ceiling without the air movement being fairly strong and
>>disruptive to visitors?  Are you going to remove the ceiling ducting?  If
>>not, why not reuse it?  If you are, is there any cost-saving by leaving it
>>in place and reusing it?
>>I think I would also want to have some assurance that there will be
>adequate
>>diffusers for the air to ensure that there would not be cold/hot spots.
>>Those are relatively easy in the ceiling, perhaps more complex in the
>floor.
>>
>>> -----Original Message-----
>>> From: Philippa Tinsley [SMTP:[log in to unmask]]
>>> Sent: November 22, 1999 12:16 PM
>>> To:   [log in to unmask]
>>> Subject:      Air conditioning/heating vents - advice needed
>>>
>>> We are currently in the process of spec-ing for refurbishment of some of
>>> our
>>> galleries and stores.
>>>
>>> I have been asked by our architect to consider putting the output vents
>>> for
>>> both hot and cold air (same vent) in the floor (rather than huge ducting
>>> along the ceiling as we currently have), probably about 75cm or 30 inches
>>> from the wall (which would visually act like a barrier to the paintings -
>
>>> something we don't currently have).  We display paintings, works on paper
>>> and some sculpture in this gallery, all contemporary.
>>>
>>> Does anyone know if this is a good/bad idea?
>>>
>>> Thanks in advance - please reply off-list if you can.
>>>
>>> Philippa Tinsley
>>> ----------------------------------------------------
>>> Registrar, Wolverhampton Art Gallery, UK
>>> [log in to unmask]
>>>
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Peta Landman, Arts consultant
429 Riley Street
Surry Hills, Sydney NSW
Australia 2010
[log in to unmask]

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