Duct layout question - Page 3
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  1. #27
    Join Date
    May 2004
    Posts
    471
    No worries duckman06

    In this economy I have to work with lots of different customers, they might be general contractors or homeowners. A lot of people are looking to save money where they can. So that means working with them on what they will do and what I will do. Just did a complete 4 plex with all new duct work. The contractor wanted to use his guy for the duct work, since they gutted the whole building. fine. They understand if it has leaks that's on there dime.
    The guy did a great job. We passed HERS testing.

    Duct work is an art and a science. Meaning there are tricks that can be done that don't show up in design software. One tip. On really long runs (over 25')
    I will make sure the duct is a bit over sized, then right at the vent will use a reducer to speed up the air exiting the vent. For example I did a 25' run of 12" and Y into to two 12' 8" runs and then reduced to 6" right at the vent.

  2. #28
    Join Date
    Nov 2009
    Location
    West Monroe, LA
    Posts
    287
    duckman 06,

    I often draw out a duct system like this but i have it to scale and draw in detailed notes. No doubt whoever drew this knew what they were doing in my option but just was not a very good pic. of the project. The drawing says cat. ceiling so i am guessing you would have it right in the middle of the house in which it will be hard to run a trunk line? Anyways remote plentum should work fine follow lynn comstock advice about the size of the remote plentum but i don't no about take off right at the end? He is a pro though!


    As far as the rest of the duct system goes it looks to be in order with the tonage you plan to put in. Just be sure to use dampers specialy with those 9 inch drops along with the 8 inch drops. Returns seem to be sized properly as well if the distance is not to far from the back of the unit. I am up with about 1950 cfm supply in which you should be able to return as well with the current set up.

    I hope it works out good for your friend??? Again listed to this guys they know there stuff. Best of Luck and let us know how it turns out for you.

  3. #29
    Join Date
    Aug 2011
    Posts
    568

    Confused

    Quote Originally Posted by r-290 View Post
    No worries duckman06

    In this economy I have to work with lots of different customers, they might be general contractors or homeowners. A lot of people are looking to save money where they can. So that means working with them on what they will do and what I will do. Just did a complete 4 plex with all new duct work. The contractor wanted to use his guy for the duct work, since they gutted the whole building. fine. They understand if it has leaks that's on there dime.
    The guy did a great job. We passed HERS testing.

    Duct work is an art and a science. Meaning there are tricks that can be done that don't show up in design software. One tip. On really long runs (over 25')
    I will make sure the duct is a bit over sized, then right at the vent will use a reducer to speed up the air exiting the vent. For example I did a 25' run of 12" and Y into to two 12' 8" runs and then reduced to 6" right at the vent.
    in the old days, we'd call that static regain!

  4. #30
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Depending on how it's balanced, off hand, the bathrooms and office look a little over conditioned and the dining room and kitchen look to be under conditioned. But only a Manual J and Manual D could tell yo uthat for sure. Don't even know which way the hosue faces or what climate it's in.


    Might be worth doing the house in 2 zones if they can afford it the 2 stage AC and furnace and zone controls. The dining room, kitchen and living room will have large swings in demand depending on occupancy and activities.

    On a side note. Its' a interesting home design. The office space is nearly as large as the kitchen/dining area. Not a bad thing if you use it as a home office 8 hours a day. But not a "typical" layout. Although the "office" could also be classified as a family room.

  5. #31
    Join Date
    Nov 2009
    Location
    West Monroe, LA
    Posts
    287
    Where is the garage? Hold on see the door image between the dining room and office? I bet the office was the carport/garage at 1 time! Also as far as there being to much air to one room that is why you install dampers so you can cut back the air you need to a room which is 2 cool and direct it to other areas that need more. Also he had a lot of dump air to deal with since using a 5 ton system.

  6. #32
    Join Date
    Aug 2011
    Posts
    568

    Smile

    Quote Originally Posted by adamwhatley View Post
    Where is the garage? Hold on see the door image between the dining room and office? I bet the office was the carport/garage at 1 time! Also as far as there being to much air to one room that is why you install dampers so you can cut back the air you need to a room which is 2 cool and direct it to other areas that need more. Also he had a lot of dump air to deal with since using a 5 ton system.
    hey adam hows west monroe doing?

  7. #33
    Join Date
    Nov 2009
    Location
    West Monroe, LA
    Posts
    287
    Quote Originally Posted by MM#7 View Post
    hey adam hows west monroe doing?
    Will it is hot like most parts of the usa!!! Do i know you?

  8. #34
    Join Date
    Nov 2009
    Location
    West Monroe, LA
    Posts
    287
    Quote Originally Posted by motoguy128 View Post
    Depending on how it's balanced, off hand, the bathrooms and office look a little over conditioned and the dining room and kitchen look to be under conditioned. But only a Manual J and Manual D could tell yo uthat for sure. Don't even know which way the hosue faces or what climate it's in.


    Might be worth doing the house in 2 zones if they can afford it the 2 stage AC and furnace and zone controls. The dining room, kitchen and living room will have large swings in demand depending on occupancy and activities.

    On a side note. Its' a interesting home design. The office space is nearly as large as the kitchen/dining area. Not a bad thing if you use it as a home office 8 hours a day. But not a "typical" layout. Although the "office" could also be classified as a family room.
    If it is too much air to those areas want dampers help? Again from what I am seeing with a 5 ton system, he is trying to dump as air as possible so system will deliver 2000 cfm or close to it. This is the not the best design but should work as long as all the ductwork and plentum is sealed up good with mastic!

    I am not a pro but layout seems to be distance for the home? I would say since going with one system t-stat should be located in the center of the house instead of at one end or the other. Again not a pro so I well shut up know and let the guys who do this day in day out answer!

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