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Type: Posts; User: R J Cedar

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  1. Im not sure which specifications you found. ...

    Im not sure which specifications you found.

    What specific information do you look for?

    My application is heating, not cooling. When you see a heating performance table like the one...
  2. For the Mitsubishi Zuba Central System, my...

    For the Mitsubishi Zuba Central System, my understanding is that lowering CFM from 1200 to 1000 the would change the system from a 3 ton to a 2.5 ton system. I wish the specifications quantified...
  3. This reply was referring to Originally Posted...

    This reply was referring to

    Originally Posted by genduct View Post
    with sensible heat factors <.80 would be 350 CFMs/ton WOuld low airflow really be that bad? Maybe the OP is in the south
    ...
  4. Not a matter of trust, more a matter of me trying...

    Not a matter of trust, more a matter of me trying to understand 3 different proposals with 3 quite different approaches on duct sizes.

    Larger trunks and ducts......that is what I...
  5. op is on the canadian west coast I dont know...

    op is on the canadian west coast
    I dont know what sensible heat changes.
    What I have as givens is 38000 btu system
    rule of thumb 12000 btu/ton, so I have a 3 ton system.
    The unit is rated at...
  6. Is this the correct way to explain my...

    Is this the correct way to explain my context....I am just looking at heating, not cooling. When I said 1200 cfm, that was for heating mode. 1200 cfm then and I am asking for that taking 200 off...
  7. I have 2 trunks which I call north and south. ...

    I have 2 trunks which I call north and south. south can take 490 cfm; north can take 460 cfm, then I have to get AHU set to 1000cfm I think, instead of 1200 cfm as I cant put the 200 cfm more...
  8. I read that a rule of thumb for rigid trunk ducts...

    I read that a rule of thumb for rigid trunk ducts is 900fpm/supply side and 700fpm/return side. So I guess you are saying - over 800fpm, meaning in the trunks and that is ok v for the trunks? Here...
  9. Existing duct system is for the cuirrent 20KW...

    Existing duct system is for the cuirrent 20KW electric furnace. For size, do you mean cfm? Not sure. Is that on the blower label plate usually?
  10. Replies
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    Hi Freeagent, You and I are putting in the...

    Hi Freeagent,

    You and I are putting in the same system, and have similar questions.

    So you have your return duct velocity down to acceptable fpm (615) from now going to 20 x 14 on the return...
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    Ok, thanks. So this would be the same as a...

    Ok, thanks.

    So this would be the same as a in-shop room air filtration system, but instead of the air circulating in the shop, it would discharge into the house circulated air (which I was...
  12. Replies
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    I am considering going to a non-electronic...

    I am considering going to a non-electronic solution based a consumer reports article recommendation for the LENNOX HC16 (and by default HC10). Specifically: Honeywell F100, MERV 11 with a sp drop...
  13. Replies
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    Thanks. Excellent review of electronic air...

    Thanks. Excellent review of electronic air cleaners.
  14. Replies
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    Considering our conversation, I have a dust...

    Considering our conversation, I have a dust situation in the basement that might affect the filter choice.

    I have a woodworking shop in the basement. I can seal it off from the heated area of...
  15. Small, relative to what? Longest runs are...

    Small, relative to what?

    Longest runs are 14 feet, straight off the trunks, there are 2 off the south trunk and 3 off the north trunk.

    Do you mean the total equivalent sp of the longest run?...
  16. What information do you need? The system is a...

    What information do you need? The system is a proposal, its not built yet.

    The AHU is a 1200cfm unit, max sp is .8, fan is variable speed.

    The filter is not yet chosen....I now understand...
  17. Replies
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    Thanks for your reply. According to Consumer...

    Thanks for your reply.

    According to Consumer Reports, you did the right thing for other reasons...get out of the ozone.

    Just going to a good media filter is what they recommend. What MERV is...
  18. Replies
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    In this Clean Effects vs Lennox PureAir thread, a...

    In this Clean Effects vs Lennox PureAir thread, a lot of information has come out about simpler solutions like Lennox HC 16 AND HC 10; a simple HONEYWELL case; or filter box that holds a 4 inch...
  19. Trunks cfm capacity reached. Ok to run ducts off plenum?

    Hello,

    I am told the max capacity of the 2 - 7 1/4" x 14 1/2" trunks I have, one running North and one running South from the plenum, is 500 cfm each.

    The 3 ton heat pump to be installed...
  20. Replies
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    Hello, What did you end up doing? I am...

    Hello,
    What did you end up doing? I am currently looking for a source for getting the am std or trane perfect fit system, after having read the Dec 07 issue of Consumer Reports on Filters. I...
  21. Replies
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    Thanks! I see what you mean, if one want to...

    Thanks! I see what you mean, if one want to figure out max pressure drop on any run. But if the objective a method get a first approximation of # of runs by duct size, without considering pressure...
  22. Replies
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    Thanks! I see what you are getting at. I have...

    Thanks! I see what you are getting at. I have no idea of the current static pressure states of what I have now. The zuba central system I am going to is good up to .8.
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    The furnace is in the center of the basement. I...

    The furnace is in the center of the basement. I have a north and south trunk only. AHU set to 1200 cfm, volume dispersed through all the system. I dont see what you are getting at looking only...
  24. Replies
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    for 5" i am using 65 cfm; for 6" using 100 cfm. ...

    for 5" i am using 65 cfm; for 6" using 100 cfm. For the 2 trunks for the plenum, I am told they will carry 500cfm each - their size is 7 1/4" x 14".

    I have not looked at returns. Current returns...
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    Can you clarify what you are saying here? ...

    Can you clarify what you are saying here? Border line, meaning what? What type of filter would you suggest if not media?
  26. In comparing MERV 11 disposable pleated media...

    In comparing MERV 11 disposable pleated media fliters across manufacturers, what measures can I use?

    MERV relates just to what particles are removed.

    For the resistance rating how is this...
  27. I understand, then yes, the mechanical room is...

    I understand, then yes, the mechanical room is heated with 2 outlets. Flow to cold air room will be in the adjacent hall, the other way from the wood working area, and positive pressure in the...
  28. Hello, Thanks for your reply. "I think the...

    Hello,
    Thanks for your reply.

    "I think the media air cleaner like the Westy in the link is the best value. Good pickup, far less restrictive than a 1" pleated. "

    OK, donít go to 1" and upgrade...
  29. Thanks for your reply. run the fan 24/7, yes. ...

    Thanks for your reply.
    run the fan 24/7, yes. ok, no return in mechanical room, but there would be one 10 feet away in a hall, where both the hall and the mechanical room are heated and together....
  30. HEAT PUMP FILTER OPTIONS? mervs and microns

    I am looking at putting in a heat pump in the basement that has a wood work shop in it.
    The shop can be sealed off, and I do not use it that much, but I wonder about filter options, considering some...
  31. Thanks for your reply. I have a document to...

    Thanks for your reply.
    I have a document to email to you, will do now.
  32. Hello Freeagent, I phoned a distrubutor and...

    Hello Freeagent,
    I phoned a distrubutor and learned a few things, good tip.
    Cfm can be set down with a resulting lower btu capacity, though not a fully proportional btu decline.
    Contractor...
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    Thanks freeagent. You pose a great question...

    Thanks freeagent. You pose a great question for a contractor to answer. I should put that to him. The concept of having the "safety" of a restrictive ductwork assessed is new to me and relates...
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    ok, thanks on the method comment. re numbers,...

    ok, thanks on the method comment. re numbers, which are you referring to? what values would you use if referring to cfm capacities for 5", 6" ducts etc if that is what you mean?
  35. I am also looking at the Zuba Central single...

    I am also looking at the Zuba Central single central ducted system. I am wondering what your air handler cfm will be set to? The Zuba Central is rated at 38000 btus, 40000max, but for that does it...
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    Acceptable method for assessing ductwork?

    I am wondering if the method I have gone through below is an acceptable rough method to ball park duct capacity to see what sizing is needed. This is my main question. The method is illustrated...
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