Install Cost: Carbon filters are usually added to buildings as either stand-alone in-room air purifiers or require significant modification of existing air handling equipment to provide the space for the carbon filter and replace fans which will likely need to be up-sized to handle the additional pressure drop. Stand-alone units are much more common for classroom applications and will cost a $200-$750 dollars per unit. Remember that the carbon content in these units is usually small, though, so frequent replacement of the carbon filters is necessary to maintain VOC removal, at between $75-$300 per filter. Round bar steel long cylindrical metal bar that has many industrial and commercial applications. Round bar can be used for a variety of practices but is mainly used for jobs where exact dimensions are not a necessity.
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