# Hi, recently had a concreter disconnect my airconditioner while pouring a concrete slab. While doing this they let all the refrigerant escape. How/ who can replace this ?

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Do not know where you are located, but these people should have never tried to disconnect the unit. Most states require the a person working on a HVAC unit be licensed and the EPA requires that anyone working with freon also be licensed. Venting freon to the atmosphere is a big time no no and subject to a very large fine. I would require this contractor to hire at their expense, a licensed a/c contractor and have them pay for it since they caused the problem. Freon is getting to be very expensive

Posted on May 15, 2008

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Posted on Jan 02, 2017

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### Convert 30pounds per sq.foot to pounds per cubic foot(concrete=150#/cubic foot at 1in. thick conc. slab).

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Pounds per sq ft is a measure of pressure, while lbs / cu ft is a measure of density, weight per unit volume.

I think maybe what you are doing here is converting the weight of concrete in a 1" slab, where a sq ft would contain

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The figure of 150 lb/ cu ft is correct for the average density of concrete, so the above slab would have

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in your example you give area of 50m2, you did not give what thickness of the slab, or should i assume this is 50m thick slab?!?

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