<div dir="ltr">Reuben-<div><br></div><div>can you take advantage of the coanda effect, in which a stream of air enjoys scurrying along a flat surface? If so, yes, shorten duct runs accordingly. And maybe reduce fan size, too, if you're reduced enough static pressure.<br><br><a href="https://en.wikipedia.org/wiki/Coand%C4%83_effect">https://en.wikipedia.org/wiki/Coand%C4%83_effect</a><br></div><div><br></div><div>-aa</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><font size="2"><font size="2"><span style="color:rgb(102,0,0)">Alan Abrams</span></font><b style="color:rgb(102,0,0)"><br></b><i><span style="color:rgb(102,102,102)">certified professional building designer, AIBD<br>certified passive house consultant, PHIUS</span></i></font><div><i><span style="color:rgb(102,102,102)">certified passive house builder, PHIUS</span></i><font size="2"><span style="color:rgb(102,0,0)"><font color="#666666"><i><br></i></font></span></font><font style="color:rgb(102,102,102)" size="1"><font size="2">cell </font></font><font style="color:rgb(102,102,102)" size="1"><font size="2">202-437-8583</font></font><font style="color:rgb(102,102,102)" size="1"><font size="2"><br>
<a style="color:rgb(102,102,102)" href="mailto:alan@abramsdesignbuild.com" target="_blank">alan@abramsdesignbuild.com</a><br style="color:rgb(102,102,102)"></font></font><a href="http://www.heliconworks.com/index2.html" target="_blank">HELICON WORKS <i>Architecture and Education</i></a></div></div></div></div></div></div>
<br><div class="gmail_quote">On Mon, Mar 28, 2016 at 4:00 PM, barbara deane-gillett <span dir="ltr"><<a href="mailto:deaneg@hotmail.com" target="_blank">deaneg@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">go for it and harvest the ductwork savings<br>
<br>
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On Mar 28, 2016, at 2:01 PM, <a href="mailto:greenbuilding-request@lists.bioenergylists.org">greenbuilding-request@lists.bioenergylists.org</a> wrote:<br>
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> 1. forced air heating vent placement (Reuben Deumling)<br>
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> Message: 1<br>
> Date: Mon, 28 Mar 2016 10:55:47 -0700<br>
> From: Reuben Deumling <<a href="mailto:9watts@gmail.com">9watts@gmail.com</a>><br>
> To: Greenbuilding <<a href="mailto:greenbuilding@lists.bioenergylists.org">greenbuilding@lists.bioenergylists.org</a>><br>
> Subject: [Greenbuilding] forced air heating vent placement<br>
> Message-ID:<br>
> <<a href="mailto:CAE5fceB0kxKhTGAAqdOOWwTK26mXib8Jr3-gwXeJS7wwMJPY7g@mail.gmail.com">CAE5fceB0kxKhTGAAqdOOWwTK26mXib8Jr3-gwXeJS7wwMJPY7g@mail.gmail.com</a>><br>
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> There seems to be a tradition of placing these all the way out at exterior<br>
> walls, and often under windows. Does this hark back to when windows were<br>
> the coldest surfaces and this would--in combination with a floor vent--make<br>
> for convective currents which could then be relied on to mix the warm air<br>
> better?<br>
> I'm in the process of adding four inches to the inside of the exterior<br>
> walls on a 140 year old farmhouse and blowing a ton of cellulose into those<br>
> deeper cavities. There will be exterior storm windows and the house overall<br>
> should end up pretty tight and cozy even without the furnace turned on. I<br>
> have to move some of these vents as they are too close to the existing<br>
> wall; my temptation is to shorten the ducts, not just by a few inches but<br>
> perhaps by a bunch. I'm curious for any thoughts or suggestions you might<br>
> have.<br>
><br>
> Thanks very much.<br>
><br>
> Reuben<br>
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