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  1. Replies
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    479

    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...
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    1,897

    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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    1,390

    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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    1,390

    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...
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    1,476

    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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    715

    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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    498

    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...
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    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...
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    407

    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...
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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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    1,199

    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!
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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...
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    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...
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    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
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    500

    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...
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