Overbury, Denmark Hill

Removal of AHU unit and Associated Ductwork

Client: Overbury
Project: Removal of AHU Unit and Associated Ductwork

Brief Description:

KpH Environmental were contracted by Overbury to carry out the removal of an AHU unit and associated ductwork in a former laboratory within the Institute of Psychiatry, Psychology & Neuroscience (IoPPN) at Kings College Hospital.

Scope of Works:

KpH were informed by the client of the list of chemicals historically used in association with the fume extraction plant in the laboratory (such as acetonitrile and methanol). KpH Environmental commissioned our trusted Environmental consultants, SLR, to undertake a sampling survey of disused fume extraction ductwork.

A total of eight separate ducts were established consisting of various dimensions and constructed from either plastic or galvanised steel. Working off podiums, KpH operatives began using battery powered reciprocating saws to make access into the ductwork an SLR’s surveyor inspected the interior of each duct and recorded any residues present to use for sampling. To avoid contamination operatives used polythene and masking tape to seal any cut openings.

With a results turnaround within 3 days and a returned analysis determined non-hazardous, KpH could progress with the removal works. Before removing the AHU, KpH had to break out a blockwork wall to expose the plant room for increased access using hand tools (working from top to bottom in a methodical manner).

Operatives began to strip down the redundant AHU unit by removing the doors, panels and fan units. Associated pipework was also disconnected and removed using battery operated reciprocating saws. The AHU frame work was broken down and cut into manageable sections and removed from site. External ductwork running up the side of the building and an extract fan on the roof was also removed working from a MEWP. All waste was loaded into separate skips for the different waste streams and removed to a licensed recycling facility

Once the works had been completed Kph handed the site back over to Overbury.