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  1. mrd

    vent grade

    Of course it's getting inspected. I explained the situation to the inspector, and he says I can install a santee in the drain orientation, that is, not inverted. I'll have to remember to keep my vents sloped to the fixture in the future.
  2. mrd

    vent grade

    As I understand it, code (at least IPC) specifies vents must slope to drain, to prevent condensation from accumulating, but it doesn't care if it slopes toward the fixture drain or toward a vent stack that slopes back to drain, as long as there aren't traps, and it slopes all the way to drain...
  3. mrd

    Refrigeration grade 1/4" coil ok for refrigerator water /ice?

    I believe for Type K/L/M coils, the nominal size corresponds to the inner diameter. For Type ACR, however, the nominal size corresponds to the outer diameter. So 1/4 ACR is smaller than 1/4 Type K/L/M. http://www.copper.org/applications/plumbing/techref/cth/tables/cthindex_table.html
  4. mrd

    Lavatory drain size

    Following the IPC, Lav = 1 DFU, and using Table 710.1(1): 1-1/2 drain @ 1/4in takes max 3 DFU, whereas 2in @ 1/4 slope takes 21 DFU max. I know greatly oversized pipes are more likely to clog.. but 2 isn't greatly oversized from 1-1/2. So which is statistically less likely to clog? The...
  5. mrd

    Building drain support above grade

    I have a 3in building drain running about 6in or so above grade in a tall crawlspace. The floor joists are 3-1/2 feet above the pipe. What's the best way to support the drain? I was considering using concrete blocks every 4', but I'm wondering if there's a chance the ground may settle...
  6. mrd

    union trap fittings

    How about a trap with cleanout?
  7. mrd

    union trap fittings

    I'm roughing in a tub, and have a schedule 40 waste & overflow assembly. The bathroom sits above a tall conditioned crawlspace, and I thought using a trap with slip joints would give the homeowner the option of clearing the trap if it ever needs it. I have a sched40 union trap like this...
  8. mrd

    Parallel wiring for dehumidistat in bathroom

    t is the duration of the shower in minutes. bw(t) is the amount of water added to the bathroom air during the shower bw(t) = aerated_water_per_minute * t iw(t) is the amount of water added to the indoor air during the shower, or after the shower when you open the door.. iw(t) = bw(t)...
  9. mrd

    Parallel wiring for dehumidistat in bathroom

    I'm fairly sure an exhaust fan would be more efficient than a dehumidifier, even including heating/cooling of replacement air, maintenance and repair of equipment, etc. Also, a passive intake to the rest of the house or outside air would work. The exception to 404.6(C) in 05 NEC appears to be...
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