N4008519T8309_Draft_SOW_summary_Duct_Cleaning_830s.docx

BUILDING 830 SERIES, DUCT CLEANING

The work includes furnishing all labor, transportation, supervision, material, equipment and performing all operations in connection with cleaning all of the bedroom ductwork in Buildings B830, B831, B832, B835, B836, B838, and B839, to include cleaning supply air ducts, exhaust air ducts, and air distribution devices located in the bedrooms. Clean all interior surfaces of the entire ductwork in each bedroom including the supply air ducts from the fan coil unit to the points where air is discharged, exhaust air ducts from the air inlet to the riser, and all air distribution devices (registers, grilles, and diffusers).

The Period of Performance for all work, including submittals, shall be 120 days.

Qualifications of the Duct Cleaning Contractor The duct cleaning contractor shall be a member of the National Air Duct Cleaners Association (NADCA).

8.8 Duct Cleaning Requirements

Cleaning and restoration procedures shall achieve the minimum level of visibly clean as defined in NADCA Standard ACR.

A. Negative Duct Pressurization The ductwork shall be kept at an appropriate negative pressure differential relative to the indoor non-work area. This negative pressure differential shall be maintained between the portion of the duct system being cleaned and surrounding indoor occupant spaces.

1. The duct cleaning contractor shall verify pressure differential during the project.

2. Vacuum collection equipment exhausting indoors shall utilize HEPA filtration and the equipment shall have a collection efficiency of 99.97% at 0.3 micron particle size and be capable of retaining dislodged debris.

3. Any equipment used to create negative duct pressurization that does not have HEPA filtration shall be exhausted outdoors to a location that would not allow re-entrainment.

B. Cleaning Methods All ductwork included in the scope of work shall be cleaned by using a suitable agitation device to dislodge contaminants from the surface and then capturing the contaminants with a vacuum collection device. Acceptable methods will include those which will not potentially damage the integrity of the ductwork or duct components.

1. The ductwork shall be cleaned using source removal mechanical cleaning methods designed to extract contaminants from within the duct and safely remove contaminants from the facility.

2. The duct cleaning contractor shall select source removal methods that will render the ductwork visibly clean and capable of passing cleanliness verification methods as described in NADCA Standard ACR.

3. No cleaning method, or combination of methods, shall be used which could potentially damage components of the ductwork or negatively alter the integrity of the system.

C. Particulate Collection All methods used shall incorporate the use of vacuum collection devices that are operated continuously during cleaning. A vacuum collection device shall be connected to the component being cleaned through a predetermined opening. The vacuum collection device must be of sufficient power to render all areas being cleaned under negative pressure, such that containment of debris and the protection of the indoor environment are assured. When the vacuum collection device is used to convey air with debris, it shall maintain a sufficient velocity and negative pressure differential in the portion of the mechanical system being cleaned.

1. All vacuum devices exhausting air inside the building shall utilize HEPA filtration and the equipment shall have a collection efficiency of 99.97% at 0.3 micron particle size, including hand-held vacuums and wet-vacuums.

2. All vacuum devices exhausting air outside the facility shall be equipped with particulate collection including adequate filtration to contain debris removed from the ductwork. Such devices shall exhaust in a manner that will not allow contaminants to re-enter the facility. Precautions shall be taken to locate the equipment down wind and away from all air intakes and other points of entry into the building. Release of debris outdoors must not violate any outdoor environmental standards, codes or regulations.

D. Containment Debris removed during cleaning shall be collected and precautions must be taken to ensure that debris is not dispersed outside the ductwork during the cleaning process.

E. Controlling Odors Measures shall be employed to control odors and/or mist vapors during the cleaning process.

8.9 Component Cleaning

All ductwork and components included in the Scope of Work must be cleaned in accordance with NADCA Standard ACR. All ductwork and components must be visibly clean as defined in NADCA Standard ACR.

1. Clean air ducts to remove all non-adhered substances so that they are capable of passing NADCA cleanliness verification tests.

2. Use mechanical agitation methods to remove particulate, debris, and surface contamination.

3. Capture dislodged substances with a vacuum collection device.

4. Do not use any cleaning methods that will damage any ductwork components.

5. Verify cleanliness after cleaning has been performed as described in NADCA Standard ACR.

8.10 Cleanliness Verification

Cleanliness verification shall be performed immediately after ductwork cleaning and prior to operation. Visual inspection of ductwork and components shall be conducted to assess that the ductwork is visibly clean as defined in NADCA Standard ACR.

A. If no contaminants are evident through visual inspection, the ductwork shall be considered clean.

B. If visible contaminants are evident through visual inspection, those portions of the system where contaminants are visible shall be re-cleaned and subjected to re-inspection for cleanliness.

8.11 Post-Project Report

At the conclusion of the project, provide a Post-Project Report indicating the following:

A. Success of the cleaning project as verified through visual inspection.

B. Areas of the systems found to be damaged and/or in need of repair.