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  1. Thread: Duct Camera

    by ferd42
    Replies
    7
    Views
    1,221

    Good for Prince William County; that complies...

    Good for Prince William County; that complies with the ADC Standards. And what's with the screws? Do you think that stuff's going to fly away?

    I've been reworking my flex in Sussex County, DE; no...
  2. Thread: Duct Camera

    by ferd42
    Replies
    7
    Views
    1,221

    Another Question

    I'll be looking for restrictions in flex ducts. I'm planning on going through branch ducts from the air outlets, and it'd be nice to continue into the main ducts for a look around. Will it fit around...
  3. Thread: Duct Camera

    by ferd42
    Replies
    7
    Views
    1,221

    Thanks! Looks like the camera base is on wheels....

    Thanks! Looks like the camera base is on wheels. How does it do going through 5" to 8" flex duct? Do you have any problems getting around the screws securing round ducts? Again, thanks.
  4. Replies
    28
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    1,659

    Good for (Contractor's) Business

    Why in the world would you increase the capacity when the old, smaller system performed so well? I'd have gone over the duct system, improved sealing and insulation, and put in a smaller system than...
  5. Replies
    14
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    1,285

    Good Answer

    REALLY!
  6. Thread: Calculation

    by ferd42
    Replies
    12
    Views
    462

    KDC: I may be able to help. Please send a...

    KDC:

    I may be able to help. Please send a follow-up:
    1. Is this a summer- winter hookup, wherein the boiler provides domestic hot water?
    2. If so, do you have (or can you obtain) 12 months' gas...
  7. Thread: Duct Camera

    by ferd42
    Replies
    7
    Views
    1,221

    Duct Camera

    I've decided that it would be good to have a duct camera (AKA "Push Camera"); would appreciate any comments on recommended features, preferred brands, etc. Many thanks!
  8. Replies
    27
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    2,739

    Duct Analysis

    Did you look at the "Contact Us" page?
  9. Replies
    27
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    2,739

    Flexible Duct Bends

    Centerline radius must be equal to (or preferably greater than) duct diameter. If the bend is down, the horizontal flex must be supported adjacent to the bend to prevent sagging over time.

    If...
  10. Replies
    27
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    2,739

    Well, if you're looking for an engineer, you...

    Well, if you're looking for an engineer, you might surf askweldin.
  11. Replies
    3
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    522

    That would be two, but only had trouble with the...

    That would be two, but only had trouble with the first stage (also powers 2.6A blower).
  12. Replies
    3
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    522

    GE THQC Circuit Breaker Failures

    Has anyone had trouble with breakers overheating and becoming open internally? The particular breakers we've seen were 60/2 240V in a 20KW strip heater. Breakers were manufactured during the fifth...
  13. Replies
    17
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    1,654

    Overkill

    WOW!! What a structure, you could probably heat it with a few candles. Seriously though, 40MBH is way more than you'll need for a quick warmup; there's nothing to be gained with a two stage.
    ...
  14. Replies
    17
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    1,654

    What's With Two Stage/Modulating?

    Why go to the expense?

    Here are three options to consider (cheapest to most expensive):
    1. Heat pump with resistance backup, wear sweaters and live with the wildly fluctuating temperatures and...
  15. Replies
    33
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    1,982

    Atlanta Design

    Manual J: 23 winter, 91 summer. This is a very good heat pump application: Very few hours below balance point; size it for the Manual J cooling load. Needless to say, you need to do something to...
  16. Replies
    51
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    21,973

    1993 Model Energy Code

    I live in a "Retard Jurisdiction" (no names, to protect me from whatever), still under 93 MEC. It's been illegal to use "Rules of Thumb" (SF?Ton) for at least 15 years, yet there are "Dinosaurs"...
  17. Replies
    7
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    869

    Crawl Space

    The object is to construct an airtight above ground crawl space and operate it at +0.15" or +0.20" WC in the real world, and to do it in such a way that it won't hasten the occupants' demise in a...
  18. Replies
    17
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    1,654

    Heat Loss Calc

    Just learned something: Manual J Table 1B supercedes Table 1A; that means your design is 8 degrees (Table 1B), not 13 degrees (Table 1A, identical to the ASHRAE 99% value I quoted). I did a quick...
  19. Thread: Moving Air.

    by ferd42
    Replies
    4
    Views
    481

    Transfer Fan

    You might try a transfer fan in the wall; Broan #511 is one type. I would think this is a Code violation: There's no H/C in the bedroom; I know it's a small place, but still...
  20. Replies
    7
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    869

    ACCA Manual D

    Some good "How To" stuff on pages 1-14 & 15, para: 1-10. Gives you the plenum pressure needed, etc.
  21. Replies
    17
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    1,654

    Heat Pump

    You have very little heating required, even at 13 degrees; the smallest gas furnace (37MBH out) would be overkill. Don't use oil. Be prepared for widely fluctuating discharge temperatures when it's...
  22. Replies
    7
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    869

    NEC

    300.22(B) applies: All wiring methods are to be plenum rated; that means MC cable, not Romex - you may not be able to use regular thermostat cable, phone cable, etc. Check with your AHJ.
  23. Replies
    7
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    869

    Nfpa 90b

    There are a LOT of restrictions on how this may be done. Basically, they're concerned with the spread of fire and products of combustion (OK, say "DUH" - that's what duct Codes are all about). The...
  24. Replies
    17
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    1,654

    No Need For Two Stage

    13 degree design, with heated space above and below (seem to remember something about heat rising). If the first stage is more than you need (as it is here), why go to the expense of a two stage?
  25. Replies
    15
    Views
    1,313

    $150

    Been There:

    Thanks for clarifying my statement, you're right on.
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