Air Handler Cleaning

Cleaning Equipment

Provide equipment and materials for cleaning, repairing, and inspection including scaffolding, rotary brushes, filters, air lances, mechanical agitators, steam cleaners, vacuums, and or other equipment necessary to perform the work specified.

Coordination

Prior to work commencement, a pre-arranged work schedule will be established with the local work group and the Manager Property Management person assigned to the location.
If changes in the pre-arranged work schedule are required, the Manager Property Management person assigned to this location will be notified immediately, and a new schedule will be arranged before work can continue.
The locally designated supervisor shall be notified upon arrival at the job site, and again when work crews leave the job site at the end of each day.

Air Handler Cleaning

Includes mixing box, coil, and fan
Vacuum the surfaces removing all loose debris.
Set up the steam cleaner outside of building, clean all surfaces that are not covered by insulation, taking care not to damage the insulation or bend the fins on the coils. Cover all bearings to protect them from damage.
Repair insulation to original condition using accepted industry standards. If insulation covering is deteriorated, reseal the deteriorated areas with Foster 40-20 or approved equivalent.

The decision of approved equals and proper procedures will be made by the Manager Property Management person assigned to the location in question.

The contractor shall keep all work areas clean and free of safety hazards at all times.

FMC Mechanical Hygiene Description

Air Duct Cleaning

Contamination shall be removed from the air distribution system and all work shall conform to the following specifications:

By inserting air lances, mechanical agitators or rotary brushes through the installed access points, gently remove all loose contaminants from the interior surfaces of the duct work to the point of collection. Where duct work has internal insulation or other fragile components take precautions not to disrupt or damage these sensitive areas.
Fan powered, high efficiency dust and particulate collection systems shall be utilized in areas where contaminants are being removed from the system. The contractor shall take all necessary precautions to prevent dirt and debris from entering the conditioned areas. The collection systems shall be a self-contained unit with appropriate components to adequately prevent dirt and debris loosened from upstream duct mains during cleaning operations from entering the conditioned spaces. The filtration within these collection systems shall be as a minimum, two stage filtration 95% efficient on 1 micron at rated flow.
Where supply ducts have either internal lining (fiberglass) or fiberglass manufactured ducts, the internal surfaces shall be coated to control surface breakdown.
After installation of the required access points into the duct work and the removal of all loosened contaminants is completed, the coating shall be applied.
Using an airless sprayer with an extension nozzle inserted through the access point, all surfaces of the duct interiors will be treated with Foster 40-20 Fungicidal Protective Coating.
Whenever the grilles and/or diffusers are removable, they shall be removed, vacuum cleaned, washed, dried and the replaced. Welded grilles may be cleaned in place. Contractor is not responsible for cleaning debris buildup on ceiling next to diffusers or grilles as part of this project.
Sanitizing the air distribution network shall be performed as required. Using a chemical distribution system coat the interior surfaces of the duct work with a fine mist of an approved sanitizing fluid. Sanitizing fluid shall be registered with the Environmental Protection Agency.

FMC Mechanical Hygiene Description

Air Handler Refurbishment

Prior to work commencement, a pre-arranged schedule of shut down times for each air handling unit shall be established with the maintenance department. The watch engineer will be notified prior to any activity with the air handling units. Engineer will be responsible for the shut down and start up of all air handling equipment. Dust sensitive sensors may be located in the duct work associated with each air handler. If so, notify engineering to bypass sensors prior to work commencement.

The intent of the air handling unit refurbishment is to control the deterioration of the internal components of the air handling unit, by restoring surfaces to original, or better condition. Work on each unit includes, but is not limited to the following:

Mixing Chamber

HEPA vacuum the interior surfaces of the mixing chamber, removing all gross debris. HEPA filters must have a DOP test number indicating that they have passed quality confirmation tests.
Set up steam cleaner in area that is safe for discharge heating fumes from steam cleaner to be used. Utilize high pressure, hot water cleaning system to remove the debris that is secured to the chamber walls (cigarette smoke stains, grease, etc.).
Repair insulation to original condition. Seal the covering with an approved sealant (Foster 40-20 Fungicidal Protective Coating).
Sanitize the entire plenum, drains, and dampers with an approved disinfectant and fungicide after equipment areas are cleaned and sealed (Foster 40-80 HVAC & Wall Disinfectant).

Filter Section

Remove filters from the rack and prepare the area for cleaning. Filters are not to be reused.
Scrape debris from the filter rack area. Vacuum clean and/or high-pressure, hot water wash the filter rack system. Ensure proper drainage is available before cleaning.
Contractors are required to use only 40% pleated air filters.

Coil Section

Take precautions not to damage coil fins. If fins are bent prior to cleaning then straighten (as best possible) utilizing a coil combing system after the cleaning process. If damage is severe, combing may be done prior to cleaning.
High pressure, hot water wash the coil section. First apply hot water to one side of the coil section. Then apply a biodegradable cleaning solution. Follow manufacturers guidelines. Allow time for cleaning solution to penetrate in the coil section. Repeat process on opposite side of coil section, covering the entire coil face.
After cleaning, sanitize coil section with an approved biocide (Foster 40-80).

Fan Section

Vacuum clean the fan housing and motors to remove debris and excess grease.
Hand scrape fan impellers and remove loose debris from the internal surface of the fan housing. Take precautions not to damage impellers, alter blade shape or weight, or affect impeller balance.
Ensure proper drainage/recovery and high pressure, hot water wash the fan section. Cover fan shaft, motor and bearings prior to cleaning.

Plenum Areas

Where internal insulation is damaged or fragile, the contractor shall repair the damaged insulation. If the insulation is damaged beyond repair replace insulation with same or equal. If the insulation facing is damaged or non-existent, the facing shall be resurfaced with an approved sealant (Foster 40-20).
Vacuum internal surfaces of the plenums associated with the air handler. Remove gross debris and other debris or excess equipment that may be present. Seal the plenum walls if leaks or holes are noted.
Sheet metal duct access doors must be provided whenever a penetration is necessary to test, inspect or apply material. Access doors should meet UL codes and have been tested to 20' WG. positive pressure with no leaking noted.
All openings must not compromise the structural integrity of the system. Construction techniques used in the creation of openings should conform to requirements of applicable SMACNA and/or NAIMA standards.

FMC Mechanical Hygiene Description

Filter Warehouse Co.
1310 N. 1st Street Suite C
Bellaire, TX 77401
E-mail: sales@filterwarehouse.com
Phone: 713.432.7969
Fax: 713.432.7117