Many times ducts are asbestos and need removal and disposal , Los Angeles apt complex cleared of asbestos material 
How do I package hazardous waste asbestos?
Asbestos is an airborne hazard, so the rules and regulations that describe the proper handling and packaging of asbestos are found in federal and state air quality regulations. The packaging required by those regulations satisfies those of DTSC. Check with your local air pollution control district to see if there are additional packaging requirements for your region.
At a minimum, you must contain and transport it in one of the following ways:
In sealed, leak-tight, non-returnable containers (e.g., plastic bags of at least 6-mil thickness, cartons, drums, or cans) from which the fibers cannot escape.
You must wet the wastes to prevent fibers from blowing around in the event that the container is broken (40 C.F.R. § 61.150), or for bulk waste that will not fit into such containers without additional breaking, wet it to prevent blowing of fibers in case the wrapping is broken, then wrap it so it will be leak-tight and seal it with packaging or duct tape.
If you are placing the wrapped and sealed waste directly in trailers or drop-boxes, you need to line the container with plastic sheeting and cover it with a tarp (Cal. Code Regs., tit. 22, § 66263.23). Wetting asbestos waste does not constitute treatment, so you do not need to obtain special authorization to do so.
How do I label the properly packaged asbestos?
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