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Old 09-03-2012, 06:05 PM   #16
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Originally Posted by beenthere View Post
I'd run n 8X20(for me probably 8X22) trunk line. 2-6" in bedroom 1, 1-6" in bedroom 2, a 5" to the bathroom, and a 5" to the laundry room, 2-6" on the outside wall of the living room, and a 7" on the wall of the shop near those steps for the kitchen.

Using the closet to bring up a return will work.
Now I am going to show you how really green I am, is the 8X22 a metal duct? when you say 2-6 is that 2 6 inch ducts? I am sorry to be so ignorant on this, I just have never done any of it the first time. OK, this is what I am seeing what you are saying. Run the 8X22 down the length of the house in the center and branch off that, is that correct?

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Old 09-03-2012, 06:16 PM   #17
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Confuse the tin men with some wood working terms!
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Old 09-03-2012, 06:18 PM   #18
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Yes that would be metal duct, wrapped on the outside. And yes, that would be 2 pipes.
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Old 09-03-2012, 08:54 PM   #19
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I have a few questions myself:

1.) Under the kitchen window meaning in a closet? Upflow or horizontal? Jim, can you take some pics of the area where you're wanting to install the unit? I'd like to see the room as well as how much room you have for ducts if you could.

2.) Why not a single return of flex duct, 14" or 16" with the according grill?

3.) Where is the return air grill and filter going to be located?

4.) Why not a regular plenum with flex take offs?

There is more than one way to skin a cat and in my opinion this would be the easiest , most cost efficient and easiest to install, quick.

Beenthere, why the trunk line?
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Old 09-03-2012, 08:56 PM   #20
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Cause I prefer not to have 20 foot plus runs of flex.
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Old 09-03-2012, 09:09 PM   #21
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So an 8 x 22 step down trunk or how long is it to be and will it need to be stepped down for this application? What about dampers? They're easier to control open and closed if at one central location such as on the plenum if they're installed. You know this, I'm not telling you anything you don't know, so would not dampers on a trunk line be a pain in the butt?

Not saying dampers are needed but if they were installed they'd be covered up by sheetrock (assuming this is a build) and useless.
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Old 09-03-2012, 09:16 PM   #22
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Cause I prefer not to have 20 foot plus runs of flex.
That's all I'm used to down here in residential. You only see trunk in commercial. I've never had an issue with air flow as long as each run is dedicated and each take off is properly located on the plenum.
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Old 09-03-2012, 09:37 PM   #23
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Jim, you said under the kitchen window. I'm having a hard time seeing this. Is this new to be conditioned area upstairs or downstairs or is this a single story dwelling? By under the kitchen window do you mean in a basement?

We need to know what kind of area you have to put the inside unit into and what the area is for duct work such as in the basement, in an attic, a crawlspace, chase, etc.? Can you explain and possibly please provide some pics?
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Old 09-03-2012, 10:31 PM   #24
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Would this be of interest to you? Browsing Store - COMPLETE HVAC DUCTWORK DESIGN & LAYOUT It's a service that designs and sells ductwork and furnaces.
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Old 09-03-2012, 11:29 PM   #25
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BT, I meant if the trunk line is going to be covered up than there'd be no point in dampers as they'd be inaccessible.

I'd still like to see the available space.
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Old 09-04-2012, 01:14 AM   #26
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This is a whole new world to me, I need to brush up on y'alls lingo. I should have hung around when the HVAC fellows were doing their thing back then.

I will get some measurements under the house hopefully tomorrow. Our house is a single story with a crawl space. I may be wrong but I believe there is close to 28-30 inches from the ground to the bottom of the floor joists. The ground is covered with 6 mil poly and the floor is insulated, mostly except where it has been removed to work on something.

I guess that was misleading saying under the kitchen window, I should have said I plan to pour a pad outside the house located about midway of the house which would be close to the kitchen window. If I need a larger access to get under the house I have a sledge and can take some blocks out.

Our hallway is about the only place to put the return as there is a closet that can be accessed to build the box for the return and have the return grate on the hall wall directly across from the main bathroom door. Hopefully it will stop raining here tomorrow so I can get some pictures and measurements.
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Old 09-04-2012, 06:00 AM   #27
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Okay, no we're getting somewhere. If you are to pour a slab on the outside and expect to connect duct work to it than the only unit you can use would be what is called a package unit. This would be an all -in-one type deal, heating and cooling in one single unit. Then you'd run a trunk line as BT has said for both the supply and return, pretty much along the center of the underneath of the home with individual duct runs to each room for the supply branching from the main trunk and one return trunk to the closet you spoke of.

Now since you are wanting to go heat only at first then that unit has to be located inside either in the closet itself or in the attic. If you do have attic space than the system can be laid down on it's side and pretty much put anywhere, if you have enough attic space. It can also be put upright as in standing up but again, attic space considered.

If you have not enough attic space for a unit or duct work than the unit is going to have to go in a closet and be what is known as a downflow system. The unit will sit in the closet in the home while the supply plenum penetrates through the floor where the ducts attach to it. The return air is simply through the door of the closet and that's it. In this situation all supply grills will be located on the floor.

1.) Do you have any attic space, enough for a unit and ductwork? In this application the supply grills can be mounted on the ceiling.

2.) Is this a manufactured home?
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Old 09-04-2012, 08:45 AM   #28
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Originally Posted by jiju1943 View Post
This is a whole new world to me, I need to brush up on y'alls lingo. I should have hung around when the HVAC fellows were doing their thing back then.

I will get some measurements under the house hopefully tomorrow. Our house is a single story with a crawl space. I may be wrong but I believe there is close to 28-30 inches from the ground to the bottom of the floor joists. The ground is covered with 6 mil poly and the floor is insulated, mostly except where it has been removed to work on something.

I guess that was misleading saying under the kitchen window, I should have said I plan to pour a pad outside the house located about midway of the house which would be close to the kitchen window. If I need a larger access to get under the house I have a sledge and can take some blocks out.

Our hallway is about the only place to put the return as there is a closet that can be accessed to build the box for the return and have the return grate on the hall wall directly across from the main bathroom door. Hopefully it will stop raining here tomorrow so I can get some pictures and measurements.
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Old 09-04-2012, 08:51 AM   #29
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what do you mean by ceiling, DP?
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Old 09-04-2012, 08:52 AM   #30
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what do you mean by ceiling, DP?
Sorry too early, I thought he had said he only could place return in closet.

He could put a return in ceiling, right? In several rooms also.

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