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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I agree with Rob – you need air. General
rule for a shop is minimum 4 air changes per hour. Since you have a new vent
system with an hrv for the house it is probably balanced at around .3 - .5 air
changes per hour. So if you just vent the shop it will suck air from the house
and create some negative pressure and unbalance the ventilation.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best thing is to isolate the shop from the
house and put in an exhaust fan – given the room size you need minimum
60-70 cfm (but go for one you can crank up higher – old range hood or
something that can get up to 300cfm). Make sure the exhaust is not under a
house window or even close or close to a neighbours window. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Need to punch a big hole for makeup air –
minimum 8” would be my suggestion – perhaps between floor joists –
you can even duct it to where you will be standing/working to get the most
benefit.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Wear a sweater and make sure to exhaust
well before cracking the door to the home.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Shops are nasty – dilute dilute
dilute.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoAutoSig><u><font size=3 color=green face="Gill Sans MT"><span
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ENVIRONMENTAL DESIGN<o:p></o:p></span></font></u></p>
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font-family:"Gill Sans MT";color:black;font-style:italic'>,. <st1:City w:st="on"><st1:place
w:st="on">DUNCAN</st1:place></st1:City>, B.C. <st1:country-region w:st="on"><st1:place
w:st="on">CANADA</st1:place></st1:country-region>, V9L 6M7<o:p></o:p></span></font></i></p>
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face="Gill Sans MT"><span style='font-size:10.0pt;font-family:"Gill Sans MT";
color:black;font-style:italic'>terrain@shaw.ca</span></font></i></st1:PersonName><i><font
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
greenbuilding-bounces@lists.bioenergylists.org
[mailto:greenbuilding-bounces@lists.bioenergylists.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Thomas Lewis<br>
<b><span style='font-weight:bold'>Sent:</span></b> October 26, 2010 4:15 PM<br>
<b><span style='font-weight:bold'>To:</span></b> greenbuilding@lists.bioenergylists.org;
<st1:PersonName w:st="on">ArchiLogic@chaffyahoo.ca</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Greenbuilding]
ventilating a tiny shop space</span></font><span lang=EN-US><o:p></o:p></span></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>a very convincing argument for fresh air, <br>
I think you changed my mind on the subject. <br>
<br>
While getting my nose clogged with particles first gave me concern, I ignored
the less obvious effects.<br>
<br>
This will have to jump on the list, not that I needed another project.<br>
<br>
My question to RT is,<br>
Where does your makeup air come from?<br>
<br>
Tom<br>
<br>
"Time makes more converts than reason." Thomas Paine, Common Sense<br>
<br>
--- On <b><span style='font-weight:bold'>Tue, 10/26/10, RT <i><span
style='font-style:italic'><ArchiLogic@yahoo.ca></span></i></span></b> wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
From: RT <ArchiLogic@yahoo.ca><br>
Subject: Re: [Greenbuilding] ventilating a tiny shop space<br>
To: greenbuilding@lists.bioenergylists.org<br>
Date: Tuesday, October 26, 2010, 1:13 PM<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>I think that it would be a mistake to not provide
exhaust and make-up air capacity for the shop.<br>
<br>
It's not just particulate matter that needs to be exhausted.<br>
<br>
ie Sometimes when using carbide cutters & blades on hardwood, smoke will
be generated.<br>
<br>
or<br>
<br>
If you ever use sheet stock (ie plywood, PB, HDF or MDF) then those materials
are going to be off-gassing, and moreso when being cut)<br>
<br>
or<br>
<br>
If your dust collection system is not a HEPA type, then there will be
particulate matter of the worst sort in the air you breathe<br>
<br>
or<br>
<br>
If you use that shop to apply liquid finishes or steenky adhesives, well, you
know.<br>
<br>
Even working with "real" (soft) wood, they will off-gas VOCs into
the indoor air environment.<br>
(CMHC's "Healthy Homes" program recommends that softwoods be
avoided for interior finish work for this reason, if any of the home's
occupants are afflicted with MCS.)<br>
<br>
Since the shop is in a basement former "cold room" (ie concrete
walls, floor and ceiling) providing good exhaust capacity should not result
in any severe thermal discomfort due to heat storage/buffering capacity of
the (well-insulated ?) thermal mass, if the exhaust is operated only during
"pollution" events.<br>
<br>
In the shop that is in my own home (as opposed to the one that is separate
from) I have an awning-type insulated (R-20) vent on which a squirrel cage
blower (salvaged from a furnace) is mounted. In winter when I need to
exhaust, snap open the sash lock, crank open the insulated awning oand then
turn on the blower. The air is sparkling clean & fresh within moments.<br>
<br>
<br>
--=== * ===<br>
Rob Tom<br>
<st1:place w:st="on"><st1:City w:st="on">Kanata</st1:City>, <st1:State w:st="on">Ontario</st1:State>,
<st1:country-region w:st="on">Canada</st1:country-region></st1:place><br>
< A r c h i L o g i c at Y a h o o dot c a ><br>
manually winnow the chaff from my edress if you hit "reply"<br>
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