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Thread: Monster removal
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11-25-2005, 07:37 PM #14
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Better check out Manual D, or read following:Originally posted by amickracing
Better air flow, less restriction, hopefully less turbulance thus a better straighter line through the filter causing better filtration.
Oh, and they look cool too :-)
Originally posted by neophytes serendipity
Radius heel elbows at the equipment on the return side do absoluteley nothing for airflow. Equivalent length is exactly the same as a square throat / square heel combo. H/W=1 then that is 45 feet of duct. H/W=2 then that is 30 feet of duct. H= opening at furnace, W= narrow width of drop.
Radius throat ells show little benefit until the throat is 1/2 the diameter of the drop (H/W).
Correctly installed turning vanes are equivalent to 10 feet of duct- same as a radius ratio of 1:1.
Reference velocity of 700 fpm @ .08" WG per 100' of duct. ACCA Manual D page A3-14.
Might as well use square throat / square heel. Cheaper and faster to make than a radius heel.
Or do it right with turning vanes.
You will find that the bottom 1/3 of the filter will get loaded faster on a sysyem without vanes or the proper radius throat because all the air is going there. Filter restriction ratings are based on using the whole filter, not just part of it.
Nice install otherwise.
[Edited by neophytes serendipity on 11-25-2005 at 09:19 AM]
That was my point these elbows ONLY LOOK good they are no better than square throat and heel elbows as stated by N.S. my hope is to encourage better understanding and function. An excellent example of where understanding this particular sheet metal application's shortcomings is where a DX coil is located right after one of these elbows, you will find that you will have the symptoms of low air flow for the refrigeration system but measuring the flow will show the proper amount.
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11-25-2005, 08:04 PM #15
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EL = equivalent length
Proper Prior Planning Prevents Piss Poor Performance
"There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey. It's unwise to pay too little.
When you pay too much, you lose a little money -- that is all. When you pay too little, you may lose everything, because the thing you bought was incapable of doing the thing it was bought to do.
The common law of business balance prohibits paying a little and getting a lot -- it can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run. And if you do that, you will have enough to pay for something better."
John Ruskin
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11-27-2005, 05:57 PM #16
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I know where there are 4 right now a working well.
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11-27-2005, 06:21 PM #17
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Air-Ease huh? That furnace looks a lot like an Armstrong to me, are they made by the same manuf?
I'm assuming there is a trap in that evap drain line and the homeowner must have uncapped the cleanout just to take a peek!
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11-27-2005, 08:06 PM #18
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Yup, Armstrong & Air Ease are identical products.
We don't trap positive pressure drains. Often put a tee in for easier flushing and usually don't cap them in a basement.
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11-27-2005, 08:12 PM #19
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Anyone else feel the need to point out my missassumptions? I really think the 3rd time is the charm lol.
Anywho... I apologize to everyone who has read my post for my misunderstanding of certain areas of duct design... but that's why I'm here, to learn more
And I'm sure many have read my post and thought the same but hopefully will be corrected by reading the rest.
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11-27-2005, 08:15 PM #20
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There are lots of people out there with those and other assumptions.
The smart ones learn a better way.
Learning is good.Proper Prior Planning Prevents Piss Poor Performance
"There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey. It's unwise to pay too little.
When you pay too much, you lose a little money -- that is all. When you pay too little, you may lose everything, because the thing you bought was incapable of doing the thing it was bought to do.
The common law of business balance prohibits paying a little and getting a lot -- it can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run. And if you do that, you will have enough to pay for something better."
John Ruskin
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11-27-2005, 08:30 PM #21
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I should paste Mr Ruskins' theory on all my proposals....
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11-27-2005, 09:12 PM #22
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Now don't I feel like a doodee-head. *humbled* What is a positive pressure drain?Originally posted by BaldLoonie
We don't trap positive pressure drains. Often put a tee in for easier flushing and usually don't cap them in a basement.
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11-28-2005, 06:14 PM #23
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We are required to use radius heel R A boots by code. I agree they do look cool even if the numbers show that they are more restictive.
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11-28-2005, 07:17 PM #24
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Positive pressure drain is a drain line from an A/C coil that is blown through. That is, the furnace is below the coil and in an upflow configurationOriginally posted by ryan_the_furnace_guy
Now don't I feel like a doodee-head. *humbled* What is a positive pressure drain?Originally posted by BaldLoonie
We don't trap positive pressure drains. Often put a tee in for easier flushing and usually don't cap them in a basement.
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11-28-2005, 10:18 PM #25
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Anyone shown the inspector the Manual D book?Originally posted by wally01
We are required to use radius heel R A boots by code. I agree they do look cool even if the numbers show that they are more restictive.Proper Prior Planning Prevents Piss Poor Performance
"There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey. It's unwise to pay too little.
When you pay too much, you lose a little money -- that is all. When you pay too little, you may lose everything, because the thing you bought was incapable of doing the thing it was bought to do.
The common law of business balance prohibits paying a little and getting a lot -- it can't be done. If you deal with the lowest bidder, it is well to add something for the risk you run. And if you do that, you will have enough to pay for something better."
John Ruskin
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11-29-2005, 01:49 PM #26
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Better you than me!
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