Results 1 to 14 of 14

Thread: Plenums

  1. #1
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Plenums



    When installing a ceiling concealed AC type with isolated flexible ducts, do you always use the standard plenums (sheetmetal) to blow the air through the grille?
    are these sheetmetal plenums isolated to prevent condensation?
    Are some of you making these themselves?

    Here are some pictures how we do it.
    The first serie of photos is plenums made with 4 different 6 different pieces, glued together in the corners. After making the corners, (how do youi say it, using glue... glueing?) we then seal the corners with alu tape.
    Attached Images Attached Images


    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  2. #2
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Re: Plenums

    These are those we cut in a 90 ° corner, just not through the outside.
    We then bend them over 6 times (also the end plates are then in 1 piece) and the outside is then very smooth, we don't have to use alu tape for it.
    Picture 3 is the PU foam coming out of the corners which can be broken of.
    Attached Images Attached Images
    Last edited by Peter_1; 20-01-2005 at 10:04 PM.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  3. #3
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Re: Plenums

    1 stpicture just bended over without glue.
    Then the connection for the flexible hose.
    Make a hole, put the ring in it and then bend over the small pieces.
    There has to be kit or glue between the connection and the case.
    Attached Images Attached Images
    Last edited by Peter_1; 20-01-2005 at 09:22 PM.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  4. #4
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Re: Plenums

    Quote Originally Posted by Marc O'Brien
    We buy them in, rather inexpensively.
    What is the cost for this plenum Marc?
    Estimate price for a plenum for a line grill of +/- 5 ft long ,10 inch heigh, 10 inch width.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  5. #5
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Re: Plenums

    That's the price for the plenum as can be seen in the picture you posted? Isolated?
    We can make it for +/- 60 to 70 Euro or 40 £. (Rough estimate)
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  6. #6
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    72
    Posts
    4,266
    Rep Power
    46

    Re: Plenums

    I don't like the flexible insulated ducts.

    Plenums are real cheap here, made of plastic, almost unlimited combinations of flexible hoses, they also come with a metal mesh for even air flow.

    I still Prefer the insulated metal sheet ducts.

    Chemi

  7. #7
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Re: Plenums

    It's a common practice here.
    Why don't you like them Chemi?
    It's going fast, they're isolated, if proper sized almost no noise, rather cheap,....
    Can you mail an adress of a manufacturer or wholesaler of th plastic ducts.
    What about isolation, static voltage on the plastic tubes, ...
    How can the mesh make an even airflow? We use for this constant volume regulators.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  8. #8
    Join Date
    Dec 2004
    Location
    LEBANON
    Age
    44
    Posts
    861
    Rep Power
    21

    Re: Plenums

    Here soem of us make it themselves , the others buy it , it coasts about 40 USD + 10% VAT , as for flexible insulated duct , it's widely used ... quick install and low price
    Engineering, sciences, math, physics and my brain will generate "not responding " soon

  9. #9
    Join Date
    Oct 2003
    Location
    Belgium
    Age
    62
    Posts
    5,645
    Rep Power
    34

    Re: Plenums

    Quote Originally Posted by botrous
    ..t coasts about 40 USD + 10% VAT , as for flexible insulated duct , it's widely used ... quick install and low price
    40 $ for what Botrous? Sheetmetal ducts? and +/- what dimensions.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  10. #10
    Join Date
    Aug 2004
    Location
    England
    Age
    51
    Posts
    745
    Rep Power
    25

    Re: Plenums

    I wonder if i can sell these to the company i'm working for at the moment?
    hmmm.
    No Skillcard needed to knock these up.

    cheers

    eggs

  11. #11
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
    Location
    Dorset
    Age
    76
    Posts
    11,192
    Rep Power
    60

    Re: Plenums

    Quote Originally Posted by Marc O'Brien
    The return plenum's .....
    Have I caught him at last or will debate begin ?
    I was always taught that only the 'supply' can be a plenum because it is an space under pressure not a vacuum.

    Now I know that in the strictest sense a return air duct is not under a vacuum as we normally refer to it. However the only way that the air can 'return' to the fan on the inlet side is to be below the surrounding atmospheric pressure; does that classify it as being 'not under pressure' ?
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  12. #12
    Join Date
    Dec 2004
    Location
    LEBANON
    Age
    44
    Posts
    861
    Rep Power
    21

    Re: Plenums

    Estimated price for a plenum for a line grill of +/- 5 ft long ,10 inch heigh, 10 inch width in lebanon is 40 USD + 10% VAT Peter , that's what i'm talking about
    Engineering, sciences, math, physics and my brain will generate "not responding " soon

  13. #13
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
    Location
    Dorset
    Age
    76
    Posts
    11,192
    Rep Power
    60

    Re: Plenums

    Quote Originally Posted by Marc O'Brien
    <snip> my use of the word "plenum" would still be correct by concept....
    Damn
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  14. #14
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    72
    Posts
    4,266
    Rep Power
    46

    Re: Plenums

    Hi Peter.

    I guess I'm old fasioned about ducts.
    I wil try to remember to take my Sony and post a few pictures of this plastic plenum and the mash.

    Feel free to remind me

    Chemi

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •