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Check out this HVAC package unit installation failure. This is not how a rooftop package unit installation should be. The unit weighs 500 pounds more or less depending on the size of the unit so proper support is a very important part of the installation. This metal platform was not big enough so the installation dummy built an extended platform out of plywood and 2x4 's and as the video shows its failing. This condition could get much worse in a major earthquake and possibly separate from the platform and rupture the gas supply line. I also found that the ducting between the unit on the roof is leaking and can pull in outside air which will throw off the air temperature split between the return air plenum and the supply registers. This unit is not going to perform well in this condition. Recommend replacing the entire roof top package unit and all the issues will be corrected.
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John Laforme
CREIA Certified Home Inspector
Home Inspection Authority LLC
www.homeinspectionauthority.com/