A project manager is developing a cleaning plan for a 15-year-old hospital's HVAC system, which includes extensive fiberglass-lined ductwork. During the initial inspection, localized sections of the liner are found to be deteriorating and friable. According to the NADCA ACR and NAIMA guidelines, what is the most appropriate course of action for these specific sections?
An ASCS is tasked with cleaning the HVAC system of a multi-story office building that utilizes a Variable Air Volume (VAV) system. What is the primary function of the VAV boxes located in the ceiling plenums throughout the building?
During a pre-cleaning inspection of a commercial kitchen's exhaust system, an ASCS observes significant grease buildup on the fan blades, inside the ductwork, and on the rooftop termination. According to NFPA 96, which TWO of the following represent the most critical risks associated with this condition? (Select TWO)
A technician is preparing to clean a large centrifugal fan within an Air Handling Unit (AHU). Before any work begins, the technician must ensure the fan cannot be accidentally energized. Which OSHA standard is MOST directly applicable to this task?
True or False: According to the NADCA ACR Standard, applying an encapsulant is the recommended primary solution for treating actively growing microbial contamination on the interior surface of sheet metal ductwork.
A facility manager wants to quantify the financial benefit of cleaning the building's heavily impacted HVAC coils. What is the most direct and significant operational benefit that results from coil cleaning that can be used to calculate a return on investment (ROI)?
While conducting a visual inspection of a 30-year-old commercial building, the ASCS finds that the return air plenum is an unlined space above a suspended ceiling, and the deck above is coated with a spray-on fireproofing material. Small amounts of this material are delaminating and entering the plenum. What is the MOST significant concern in this situation?
Which type of contaminant is primarily targeted for removal by using an Air Filtration Device (AFD) equipped with activated carbon filters?
A cleaning crew is establishing containment around an AHU in the mechanical room of an occupied office building. To protect the rest of the building from contamination during the cleaning process, what is the correct pressure relationship that must be established and monitored?
The following case study is for the next 2 questions. **Company Background:** CleanFlow Solutions, a NADCA-certified company, has been contracted by a university to perform a complete HVAC system cleaning for a 50-year-old library building. The library is a historic landmark, and its original construction documents are available. The university's primary concerns are improving indoor air quality for students and preserving the historic character of the building's interior spaces. **Current Situation:** The HVAC system consists of two large, built-up air handling units (AHUs) in the basement that serve the entire four-story building through a constant volume, dual-duct system. The supply and return ductwork is primarily galvanized sheet metal, but some branch ducts were retrofitted with flexible ductwork in the 1990s. A visual inspection reveals significant dust and debris accumulation on the AHU cooling coils, fan assemblies, and throughout the ductwork. The drain pans show signs of sludge and staining, indicating past moisture problems. Several ornate, historic ceiling diffusers are non-standard and fragile. **Requirements & Constraints:** 1. The library must remain partially operational during the project, with cleaning performed after hours (10 PM to 6 AM). 2. Strict containment procedures must be used to protect the library's rare book collection from any dust or debris. 3. The historic ceiling diffusers cannot be replaced and must be cleaned carefully without being damaged. 4. The university requires post-cleaning verification to confirm that the system meets NADCA's standard for cleanliness. 5. The project must adhere to the IICRC S520 standard due to evidence of past microbial growth in the AHUs. **Question:** Given the project requirements, what is the most appropriate cleaning methodology for the fragile, historic ceiling diffusers?