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Posted by StarkShark on October 29, 2007, 9:55 am
The heating and cooling in my house is functioning well. One room upstairs
is a little cool when the heat is on, a little warm when the AC is on, but
that's about it. It's a forced air system that was installed to replace a
gravity feed coal furnace.
The system has two air returns. One in the living room, about 12 inches
square, and a giant one in the kitchen, 24 X 30, or 720 square inches. The
duct in the kitchen is formed from two 10 inch deep joists. As I see it,
the joists form a return duct about 28 X 10, or 280 square inches.
With all else remaining the same, can I reduce the opening in the floor to
about 10 x 30, or 300 square inches without harming the intake volume of
the duct?
To me, it looks like breathing through a straw. You can put a funnel on
the straw, but it won't make you get any more air through the straw. So
does the opening in the floor need to be so huge?
I suspect it's so large only because the duct was that way when the furnace
was installed.
Thanks
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Posted by Noon-Air on October 29, 2007, 11:26 am
> The heating and cooling in my house is functioning well. One room
> upstairs
> is a little cool when the heat is on, a little warm when the AC is on, but
> that's about it. It's a forced air system that was installed to replace a
> gravity feed coal furnace.
>
> The system has two air returns. One in the living room, about 12 inches
> square, and a giant one in the kitchen, 24 X 30, or 720 square inches.
> The
> duct in the kitchen is formed from two 10 inch deep joists. As I see it,
> the joists form a return duct about 28 X 10, or 280 square inches.
>
> With all else remaining the same, can I reduce the opening in the floor to
> about 10 x 30, or 300 square inches without harming the intake volume of
> the duct?
>
> To me, it looks like breathing through a straw. You can put a funnel on
> the straw, but it won't make you get any more air through the straw. So
> does the opening in the floor need to be so huge?
>
> I suspect it's so large only because the duct was that way when the
> furnace
> was installed.
> Thanks
I can't *see* it from here, and your missing 90% of the required information
to even be able to make an educated guess. Call your *LOCAL*, competent,
licensed, insured, professionally trained, HVAC technician.
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Posted by Lloyd E. Sponenburgh on October 29, 2007, 11:34 am
>
>> The heating and cooling in my house is functioning well. One room
>> upstairs
>> is a little cool when the heat is on, a little warm when the AC is
>> on, but that's about it. It's a forced air system that was installed
>> to replace a gravity feed coal furnace.
>>
>> The system has two air returns. One in the living room, about 12
>> inches square, and a giant one in the kitchen, 24 X 30, or 720 square
>> inches. The
>> duct in the kitchen is formed from two 10 inch deep joists. As I see
>> it, the joists form a return duct about 28 X 10, or 280 square
>> inches.
>>
>> With all else remaining the same, can I reduce the opening in the
>> floor to about 10 x 30, or 300 square inches without harming the
>> intake volume of the duct?
>>
>> To me, it looks like breathing through a straw. You can put a funnel
>> on the straw, but it won't make you get any more air through the
>> straw. So does the opening in the floor need to be so huge?
>>
>> I suspect it's so large only because the duct was that way when the
>> furnace
>> was installed.
>> Thanks
>
> I can't *see* it from here, and your missing 90% of the required
> information to even be able to make an educated guess. Call your
> *LOCAL*, competent, licensed, insured, professionally trained, HVAC
> technician.
>
>
>
The OP missed one important thing. That "funnel" is covered by a web of
sometimes open, sometimes mostly-closed webbing called a "filter". It
restricts the airflow, such that the filter area must be larger than the
duct, unless you use deep-pleated filters (which it ain't likely your
system is equipped with).
The competent local HVAC guy can tell you what the filter area needs to
be for a specific air flow and filter type.
LLoyd
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Posted by on October 29, 2007, 12:38 pm
> The heating and cooling in my house is functioning well. One room
upstairs
> is a little cool when the heat is on, a little warm when the AC is on, but
> that's about it. It's a forced air system that was installed to replace a
> gravity feed coal furnace.
>
> The system has two air returns. One in the living room, about 12 inches
> square, and a
"giant one in the kitchen"
Against Code
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Posted by udarrell on October 29, 2007, 3:37 pm
This is a multi-part message in MIME format.
--------------040301080306020505070002
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
kjpro @ usenet.com wrote:
>
>
>>The heating and cooling in my house is functioning well. One room
>>
>>
>upstairs
>
>
>>is a little cool when the heat is on, a little warm when the AC is on, but
>>that's about it. It's a forced air system that was installed to replace a
>>gravity feed coal furnace.
>>
>>The system has two air returns. One in the living room, about 12 inches
>>square, and a
>>
>>
>
>"giant one in the kitchen"
>
>Against Code
>
>
Returns are never supposed to be put in kitchens or bathrooms.
No Returns in basements, unless gas (oil) furnaces, water heaters & gas
dryers are tightly sealed off separate from the Return area.
Why wasn't a big Return Run put upstairs for cooling?
Do you live in a hot climate? - udarrell
--
WISDOM PRINCIPLED EMPOWERMENT COMMUNICATIONS -
THE REAL POLITICAL ISSUES & WISDOM Principled PEOPLE EMPOWERMENT
http://www.udarrell.com/ (Updated Again)
It is time to create a "Department Of Peace - HR 808)" that will preempt the
Department of War, camouflaged as the Department of Defense.
http://www.udarrell.com/my_pages2.htm (Gravel's Audio concerning Iran)
(* My Airconditioning Links, Hunting Shooting, Angus Cattle)
Reality Is Not An Easy Thing To Be Confronted With, or to ACCEPT.
--------------040301080306020505070002
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
kjpro @ usenet.com wrote:<br>
<blockquote cite="midc2cf1$4725fe73$9440c41e$18138@STARBAND.NET"
type="cite">
<pre wrap="">"StarkShark" <a class="moz-txt-link-rfc2396E"
<a class="moz-txt-link-freetext"
</pre>
<blockquote type="cite">
<pre wrap="">The heating and cooling in my house is functioning well. One
room
</pre>
</blockquote>
<pre wrap=""><!---->upstairs
</pre>
<blockquote type="cite">
<pre wrap="">is a little cool when the heat is on, a little warm when the AC
is on, but
that's about it. It's a forced air system that was installed to replace a
gravity feed coal furnace.
The system has two air returns. One in the living room, about 12 inches
square, and a
</pre>
</blockquote>
<pre wrap=""><!---->
"giant one in the kitchen"
Against Code
</pre>
</blockquote>
Returns are never supposed to be put in kitchens or bathrooms.<br>
No Returns in basements, unless gas (oil) furnaces, water heaters &
gas dryers are tightly sealed off separate from the Return area. <br>
<br>
Why wasn't a big Return Run put upstairs for cooling? <br>
Do you live in a hot climate? - udarrell <br>
<pre class="moz-signature" cols="72">--
WISDOM PRINCIPLED EMPOWERMENT COMMUNICATIONS -
THE REAL POLITICAL ISSUES & WISDOM Principled PEOPLE EMPOWERMENT
<a class="moz-txt-link-freetext"
href="http://www.udarrell.com/">http://www.udarrell.com/</a> (Updated Again)
It is time to create a "Department Of Peace - HR 808)" that will preempt the
Department of War, camouflaged as the Department of Defense.
<a class="moz-txt-link-freetext"
href="http://www.udarrell.com/my_pages2.htm">http://www.udarrell.com/my_pages2.htm</a>
(Gravel's Audio concerning Iran)
(* My Airconditioning Links, Hunting Shooting, Angus Cattle)
Reality Is Not An Easy Thing To Be Confronted With, or to ACCEPT.
</pre>
</body>
</html>
--------------040301080306020505070002--
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