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  1. Replies
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    520

    Highlight my name and use contact info. ...

    Highlight my name and use contact info. Explanation too long for back and forth posts
  2. Let me understand this You have chilled water...

    Let me understand this You have chilled water and the designer didn't select a coil, deep enough to remove the latent ( RH) load and you have to either pre heat or re heat the air? HMMMM...
  3. Regardless of the units that we use, the main...

    Regardless of the units that we use, the main advantage of ductboard is the low leakage compared with standard sheet metal duct, You are sizing your duct based on your fan, so you'll need to get...
  4. Replies
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    1,963

    The answer to your question is: The air needs a...

    The answer to your question is: The air needs a low resistance path to get back to the unit, and undercut 3/4" clear space under the door is good for about 80 CFMs so use Darrells "jump duct" advice...
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    Hey Mr Bill, long time no hear, I sometimes go...

    Hey Mr Bill, long time no hear, I sometimes go into "remission" with posts but to answer your question How about if the unit was horizontal, you know those typical "economy" jobs with just a...
  6. You may first want to ask yourself, Why is this...

    You may first want to ask yourself, Why is this unit removing thrheat but not the humidity? Is the charge right? probably or you wouldn't cool Is the airhandler set at 350 CFMs per ton for that...
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    Darrell, there are a couple of "old BEST...

    Darrell, there are a couple of "old BEST PRACTICES" that are not really based in fact or engineering, like within 6 or 12 inches of the end of a duct OR as you mentioned: the endcap OR the top of...
  8. Replies
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    1,488

    If the customer did a similar thing to you as an...

    If the customer did a similar thing to you as an auto mechanic, how would you feel about the situation?
  9. Replies
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    787

    If the duct ( other than you concerns about too...

    If the duct ( other than you concerns about too big) is sound and will carry the air THEN BIGGER IS BETTER!!!!

    Bigger duct means lower velocity, which means less fan horse power.

    Same...
  10. Replies
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    643

    Seems like your main concern is winter (you...

    Seems like your main concern is winter (you probably don't see much summer load) and therefore you may want to check indoor pressure WRT (with reference to) the outside, keeping inside slightly...
  11. You do understand, that unless the intake of...

    You do understand, that unless the intake of that exhaust is very close to the source of the soldering fumes, that it is going to have very little effect on the air quality!

    Industrial exhaust...
  12. Great answer! every time you "start-up" the unit...

    Great answer! every time you "start-up" the unit and reduce the indoor temp and RH , there is the possibility and in Miami, the probability of sweating duct!
    Thing is, bare duct is going to be...
  13. I agree with beenthere, it's all about...

    I agree with beenthere, it's all about usuage,recovery rate/ storage with the complication of a better rate for off-peak. Although I don't see where on peak usuage would trip, or get close to 80%...
  14. The added 8" duct will reduce the overall...

    The added 8" duct will reduce the overall resistance of t6he duct system and therefore you should get more CFMs with the lower Available Static Pressure
    Which enc you put the exhaust fan will...
  15. Replies
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    557

    How about just an outside air louver, low and...

    How about just an outside air louver, low and through the wall to equalize the pressure diff? if there isn't a concern about freezing ( you said seasonal) then you don't even need a damper to seal...
  16. Replies
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    440

    You're right George, too many contractors go...

    You're right George, too many contractors go broke because they didn't know their cost.
    But you'll agree (I believe) that one of those cost is the Sales cost of the SG&A and just as important HOW...
  17. Replies
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    Clearly you are "fiber-phobic" and therefore...

    Clearly you are "fiber-phobic" and therefore Dan's reference below"



    Is really timely! All concerns about "fibers in the airstream has been put aside when the Govt accepted ( 9 years later) ...
  18. Replies
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    1,374

    Point is, So I would harbor any bad felings for...

    Point is, So I would harbor any bad felings for what you didn't know and therefore didn't tell them and then they didn't know either!
  19. Replies
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    I share Dan's concerns PLUS I would like to...

    I share Dan's concerns PLUS I would like to mention the much higher First Cost and the Much higher Repair cost and limited number of people who can service the more complicated unit
    The owning cost...
  20. NO you are not nitpicking, but you are showing...

    NO you are not nitpicking, but you are showing off! Clearly you know the proper procedures, so I wonder why you even posted this?

    You asked the question, I thought I would say out loud what I...
  21. Replies
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    440

    Let's see: You came recommended by your mutual...

    Let's see: You came recommended by your mutual friend/ acquaintance, the contractor got the lead with no sales marketing cost, you were described as a reasonable / low maintenance,/ business owner...
  22. Replies
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    1,822

    Teddy bear, it's my understanding that you need...

    Teddy bear, it's my understanding that you need organic material (dirt) AND LIQUID WATER to row "bugs"
    After all the place where the highest RH found is at the discharge of the AC unit

    Does that...
  23. Replies
    9
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    533

    Do you insulate then cut and mount take offs? ...

    Do you insulate then cut and mount take offs? Sounds better than next Mount take offs then insulate?

    Do you double insulate attic ducts? Bad idea to have a double vapor barrier that would...
  24. You Guys clearly got the skinney on this poster, ...

    You Guys clearly got the skinney on this poster, I give up and will go quietly

    Thing is the answer to his question is of no value to a DIY except to make clear that the "civilian" is not going to...
  25. Yes, increasing the motor speed will require more...

    Yes, increasing the motor speed will require more energy, but a small amount compared with running the unit longer to get the troubled area to temp while over-cooling the other spaces
    Increase...
  26. Replies
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    I think you answered your own question

    I think you answered your own question
  27. Point taken, Of course if this tech is the...

    Point taken,
    Of course if this tech is the kind of person who takes pride and possession of the work he does, than that could explain the "my" part

    Don't you agree that we didn't and couldn't...
  28. Clearly you are not from US Ductboard is tested...

    Clearly you are not from US
    Ductboard is tested to 2.5 times listed velocity and no erosion, so at 2500 FPM which is 3X what you would normally see in typical residential designs, velocity is not...
  29. Replies
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    beshvac is right! you don't have a sealed crawl...

    beshvac is right! you don't have a sealed crawl space, you have an indoor swimming pool!!!!!

    If cost is a factor, you may want to insist that the w3ell meaning HVAC Contractor who didn't...
  30. I think you all are misunderstanding this guy, ...

    I think you all are misunderstanding this guy, who is most likely in the biz, not one of the approved or a DIY who has a non US piece of equipment and was looking for an answer that has nothing to...
  31. Replies
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    385

    I thought the big problem was not having enough...

    I thought the big problem was not having enough capacity for the connected load? Wonder why you couldn't just use a smaller nozel if you think the "overfire" was too high?
  32. I think the Non Chemical / JM reference was made...

    I think the Non Chemical / JM reference was made to do exactly what has happened....You asked the question Chemical what?
    I think JM is calling your attention to the potentially bad fire...
  33. Replies
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    2,065

    The connector vs duct issue is a matter of the...

    The connector vs duct issue is a matter of the flex passing 1 or 2 additional tests like flame penetration (I think) almost all the manufacturers have gone to the DUCT classification but consider the...
  34. George has it right! The return has top be large...

    George has it right! The return has top be large enough to provide a low resistance path back to the unit And a brilliantly placed return grill (location( will not make up for not enough or properly...
  35. If Nat Gas is aviliable and the Utility doesn't...

    If Nat Gas is aviliable and the Utility doesn't discount Heat Pump use any longer than 90% Gas Furnace best bet. You can hedge your bet somewat by installing a heat pump split instead of just a...
  36. If your unit is charged and running properly then...

    If your unit is charged and running properly then Seems like you may have a problem with the quality of the home itself...... Get a blower door test top see how much infiltratration you have Then...
  37. Replies
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    Your Gravity duct system worked with gravity...

    Your Gravity duct system worked with gravity because it was low resistance / oversized!! That means it had next to no real pressure and a lot of surface area that makes Energy rater's advice about...
  38. Me thinks that you may not be as comfortable as...

    Me thinks that you may not be as comfortable as you would like AND you may have concluded that the location of the diffuser is the reason for the situation. You first need to figure out if you are...
  39. Replies
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    1,261

    The idea is to get the right amount of air to the...

    The idea is to get the right amount of air to the space that does the job.
    If you don't have airflow problems and just don't like the "look " of the standard registers than that is just a...
  40. Replies
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    2,798

    Redundant and oversized? There are enough...

    Redundant and oversized? There are enough safeguards in the design calcs to handle this. Oversizing will not only increase cost but also may not remove humidity as well as a right sized or even a...
  41. Thread: Hrv yes or no

    by genduct
    Replies
    3
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    543

    Without a blower door test to MEASURE...

    Without a blower door test to MEASURE Infiltration, and how effective your insulation job is, you can only Guess
    My engineer Son has a 9x11 poster that says " Without the DATA you are just someone...
  42. Replies
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    Hey Energy! I am suprised you didn't suggest...

    Hey Energy! I am suprised you didn't suggest they just fill the whole space up with closed foam and call it a day
    Mike
  43. Replies
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    That' R8 2 inch duct board

    That' R8 2 inch duct board
  44. Replies
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    2,545

    This might make the problem worse with an even...

    This might make the problem worse with an even greater supply of humid air

    Consider replacing the flex with a R* duct board trunk with short flex tie ins, that will probably have half the surface...
  45. Replies
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    940

    Do you really set the temp to 68? with those...

    Do you really set the temp to 68? with those low temps, do you see your breath when you walk into your home? Insulation is there to slow the heat transfer, but it is also there to controll...
  46. Replies
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    Your insight is right on! The unit needs a low...

    Your insight is right on! The unit needs a low resitance path for the air to get back and found it with the 10x10 If you have a standard water heater in the same space as the heater, i would...
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    Peter, you said "or I should clean my home...

    Peter, you said "or I should clean my home diligently and change the filter often." You clearly have high personal standards and I believe that unless your previous owners NEVER changed filters...
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    I think you'll find that you need LIQUID WATER...

    I think you'll find that you need LIQUID WATER aand Food ( dirt) to grow BUGS ( mold) and the temp range is not the controlling factor
  49. Replies
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    I thought that the idea of chilled water is to...

    I thought that the idea of chilled water is to get a deeper (more rows) coil to get at that latent load. a DX coil would freeze with the deeper coil
  50. Replies
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    dan is right your smart phone has an app that...

    dan is right your smart phone has an app that can measure dbA and 35 sounds reasonable 30 would be a Library level
    you need liner or board for those equipment "insertion" noise
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