For safety, the technician should be shown where the fire extinguisher and first aid kit is located. Also, it is best to provide them with any emergency contact information. Duct cleaning can be noisy. It is best to do it during non-work hours.<br>Clear work areas. Ask your technician how much space is needed around the furnace, the air-conditioner, and each air vent register. It is best to have these areas cleared beforehand.<br>Make sure all personnel are aware that the ducts are going to be cleaned and that all offices and rooms that are serviced remain open and unlocked.<br>Perform a walk-through of the facility to go over where protective coverings such as drop cloths and corner guards will be placed. Also, it is necessary to go over the HVAC, how it will be cleaned, and the accessibility of it.<br>Coordinate with Building Engineer or Superintendent to go over specifics of building layout and safety.