Recent content by mhylmz

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  1. M

    Fresh air intake (ERV) unit noise levels

    We are planning to purchase an ERV for our 2800 sqft home (ZIP code 94022). We have narrowed down the search to the following two units: Broan ERV140TE or Broan ERVH100S. We did consider more efficient and more expensive units like Ultimate Air or Zehnder, but they either have very long wait...
  2. M

    Rain damage to acrylic metal primer

    Yes, I think that is what I will do.
  3. M

    Rain damage to acrylic metal primer

    We got a surprise rain about 4 hours after I sprayed a bunch of metal posts and channels with one: http://www.sherwin-williams.com/painting-contractors/products/catalog/pro-industrial-procryl-universal-acrylic-primer/ In the next morning, I can see bubbles appearing on some of the items I...
  4. M

    Fujitsu mini split outdoor unit makes excessive noise

    With "conduit", I meant the electrical liquid-tight metallic one. It is attached to unit as expected. The lineset cover is PVC, it does not directly touch the unit. There is a 12" gap, but the lineset is wrapped inside another PVC tape between the lineset cover and the unit, and it touches...
  5. M

    Dense packed cellulose in 2x4 stud walls

    I live in San Francisco Bay Area. The code is R13 for walls. I decided to go with rockwool for the walls. Lowest temps are low 30's for winter. Sometimes 30-31, but rarely.
  6. M

    Fujitsu mini split outdoor unit makes excessive noise

    WyrTwister: The unit is 2 ft off the ground. Brackets are custom made from 1.5" steel square tube, 2" steel channel, and 2" angle irons (all 1/8" thick) and secured to wall very well. The bracket can carry four of these units without any problem, probably wall will give up before the bracket :)...
  7. M

    Dense packed cellulose in 2x4 stud walls

    This is an exterior wall, and the outside part of the wall is still there. I just removed the old plaster wall from inside. This document shows all the chemicals they add to the cellulose: http://www.greenfiber.com/images/technicaldocuments/730201573119AMBlended%20Stabilized%20Formula.pdf...
  8. M

    Dense packed cellulose in 2x4 stud walls

    Has anyone tried dense-packing cellulose insulation in walls using Home Depot/Lowes DIY cellulose blowers ? I am trying to decide between RockWool R15 batts and dense packing cellulose, and I am not sure whether a stronger blower is needed for cellulose. Since I opened up the walls, I am...
  9. M

    Fujitsu mini split outdoor unit makes excessive noise

    Here is an official response from Fujitsu, for anyone having a similar problem: "If wall brackets are on a frame wall, noise from outdoor unit can be amplified. If sufficient vibration dampeners do not help the situation, the only recourse may be to move unit off wall brackets and mount on heat...
  10. M

    Fujitsu mini split outdoor unit makes excessive noise

    The wall is a 2x4 16" OC stud wall with no insulation. Siding is 7/8" stucco. I opened up the walls in that room to add insulation. I will also add some noise reduction assembly (green glue with 2 layers of drywall). I hope it will help. The noise is pretty low when only a few indoor units are...
  11. M

    Fujitsu mini split outdoor unit makes excessive noise

    Here are some pics of how the compressor legs are bolted. You can see the gap between the metal washer and black compressor leg sitting on rubber legs. There is a rubber washer between the metal washer and the compressor leg, but it is not pressed. I tried to press the nut down, but it does not...
  12. M

    Fujitsu mini split outdoor unit makes excessive noise

    I did the install recently. This is a brand new system. And it works fine except the noise part. The issue was immediately apparent upon turning on all indoor air handler to max heating capacity.
  13. M

    Fujitsu mini split outdoor unit makes excessive noise

    We have installed a Fujitsu AOU48RLXFZ1 outdoor unit on the exterior wall of our house. There are 6 indoor units connected to this outdoor unit. This is in San Francisco Bay Area. When the outdoor unit is running, it creates a significant amount of vibration and noise. Although there are...
  14. M

    Seismic retrofitting an old house

    Our house was built in 1956. We live close to San Andreas fault line, it is within 10 miles distance to the house, in San Francisco Bay Area. The house has no cripple walls and it is a single story, ranch style house. It has a crawlspace, and a foundation wall of about 2 ft high. The floor...
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