Scope of Work:
HEATING, VENTILATING AND AIR CONDITIONING SYSTEMS
CLEANING PROCEDURE:
The
following air conditioning systems Cleaning and Refurbishment Procedure
description has been developed for the purposes of cleaning, sanitizing
and remediation of the HVAC systems and ductwork of the buildings
described in the Agreement, which incorporates this Scope of Work
document. The work performed by (Contractor) in
accordance with the (NADCA) National Air Duct Cleaners Association
Assessment, Cleaning, & Restoration of HVAC Systems ACR 2006 and The
Institute of Inspection, Cleaning and Restoration Certification
Standard S520 (IICRC S520).
This
description outlines the procedures the Contractor shall employ in the
cleaning and refurbishment of Air Handling Units and all associated air
side supply air and return air ductwork. The cleaning procedures shall cover the following equipment:
All components of the airside surfaces of Air Handling Units.
Airside surfaces of supply air ductwork, return air ductwork, outside air ductwork.
Airside surfaces of all Variable Air Volume devices and mixing boxes.
All supply air diffusers and return air grilles.
Contractor Qualifications shall
include at a minimum a Class A Certified Air Conditioning License for
unlimited work in air conditioning issued by the State of Florida
Department of Business and Professional Regulation. A NADCA certified ASCS employee shall be on job site at all times during HVAC systems cleaning and refurbishment.
Quality Control/Quality Assurance of
work performance shall be guaranteed by the compilation of a
photographic report at the end of the project. The photographs shall
show the before cleaning and after cleaning conditions found in each air
handling unit and associated ductwork.
A. In
order to comply with OSHA Standards, General Industry 29 CFR 1910.147, The Control of Hazardous Energy (Lockout/Tagout), Contractor shall
incorporate all sections of the standard into the work plan for each
area we work in.
B. Contractor shall
provide all labor, supervision, material, equipment and supplies
necessary to clean, sanitize and refurbish the air conditioning systems
and associated components. All employees and individuals
shall have received Respiratory Protection Training and Quantitative Fit
Testing in accordance with OSHA's Respiratory Protection Standard (29
CFR 1910.134). Contractor shall provide written proof of annual
Certification testing for each employee by a Board Certified Industrial
Hygienist. In addition, Contractor
shall provide written proof of annual compressive medical examination
demonstrating employee pulmonary stress testing for respirator use.
C. Prior to the cleaning and remediation, an evaluation shall be performed on the building and air conditioning system. The air conditioning system shall be inspected for potential contaminates in the air stream of the building.
D. Contractor
shall thoroughly inspect and clean the inside of all Air Handling
Units, all Variable Air Volume devices (VAV boxes), mixing boxes, all
supply air ductwork, return air ductwork and outside air ductwork. It
shall be Contractor's responsibility to ensure that the ductwork and the
inside of air handling units are not damaged or have defects. If corrections are required, it shall be reported to the Owner's representative.
E. All
surface areas, work stations, desks, chairs, counters and walking areas
shall be covered with plastic sheeting before any ceiling panels are
removed. All work sites shall be cleaned up and debris removed at the end of work each day by Contractor.
F. Contractor
shall furnish Certificate(s) of Insurance which indicate that insurance
coverage has been obtained which meets the requirement as outlined
below:
A. Worker's Compensation Insurance for all employees of the Contractor as required by Florida Statute 440. Bodily Injury by accident Insurance limits shall be $1,000,000 (Each
Accident), and Bodily Injury by Disease shall be $1,000,000 (Policy
Limit), and Bodily Injury by Disease shall be $1,000,000 (Each
Employee).
B. Public
Liability Insurance on a Comprehensive basis in an amount not less than
$1,000,000 and General Aggregate Limit of $2,000,000. In
addition, Products/Completed Operations Aggregate Limit of $2,000,000
and Personal & Advertising Injury Limit of $1,000,000. Owner must be shown as an additional insured with respect to this coverage.
C. Pollution
Liability Insurance shall be required with a General Aggregate Limit of
$2,000,000, Each Occurrence Limit of $1,000,000 and Contractor's
Pollution Liability-Occurrence of $1,000,000 in addition to Professional
Liability Insurance Limits of $1,000,000.
D. Automobile
Liability Insurance and Uninsured Motorist Single Limit covering all
owned, non-owned and hired vehicles used in connection with the work, in
an amount not less than $1,000,000 combined single limit per occurrence
for bodily injury and property damage.
The
insurance coverage required above shall include those classifications,
as listed in the standard liability insurance manuals, which reflect the
operations of the Contractor.
Installation of Access Doors:
A. To
ensure proper cleaning of the air handling units and ductwork, access
panels and access doors will be installed at the required locations to
gain service openings into the air handling units and ductwork. Any and all access entries shall be fitted with insulated and hatched access doors or panels sealed with caulking and gaskets.
B. Access
panels or access doors shall be installed in supply ductwork within 4
to 6 feet from the air handling unit, and shall be between the air
handling unit and the first set of turning vanes. All
cut or raw edges of fiberglass shall be sealed with duct mastic and
then coated with an EPA registered antimicrobial protective coating.
C. Access
panels or access doors shall be installed at the discharge of the AHU
to provide open access to the supply ductwork and discharge of the
blowers for the purpose of inspecting and cleaning.
D. Where
applicable, an access panel or access door shall be installed in the
return air plenum to provide access for inspection and cleaning of one
side of the coil and in the first ten (10) feet of return air ductwork,
face and by-pass dampers.
E. Prior
to gaining access or starting work inside the air handling units, the
motor shall be de-energized as specified by OSHA requirements. The air handling units shall then be put under negative pressure by a HEPA filtered negative air machine. This negative pressure shall be maintained during the entire cleaning and decontamination procedure. The
negative air system shall be attached to the air conveyance system and
shall remain in operation until no cleaning or antimicrobial protective
coating odors are detected in the exhaust air.
Refurbishing Air Handling Units:
A. The
cleaning procedures shall include all components of the air handling
unit, including but not limited to the coil, condensation pan, purging
the condensate drain line, fan blades and housing, insulation, turning
vanes and air handling unit vibration couplers. Motors shall be covered during the cleaning to prevent contamination or water and chemical intrusion.
B. The cleaning and decontamination procedures shall involve the following procedures. After
the air handling units and the ductwork have been properly accessed,
the inside surfaces of these areas shall be HEPA vacuumed to remove any
visible microbial growth and contaminant surface debris. Then Coil
Cleaner shall be sprayed on both sides of the coils and then rinsed with
a pressure rinse of at least 800 psi (unit ventilators and smaller
fan/coil units shall be rinsed with less water and pressure). The foaming coil cleaner shall be applied repeatedly until the foam rinses clean and white. The
coils shall be thoroughly rinsed and the condensate pan shall be
cleaned and flushed after the foaming coil cleaner applications.
C. The fan blades and inside of the fan housing shall also be cleaned with diluted coil cleaner and then flushed. Contractor
mechanics shall make a 1-1/2" hole at the bottom of the housing to
provide drainage for the dirt and metal cleaner and water. This hole shall be covered with a patch after the cleaning. The condensate drain line shall be purged at this time. The blower housing shall be painted with a rust inhibiting primer and coated with an EPA registered antimicrobial coating.
D. The drain pans shall be resurfaced with PANCRETE drain pan protective sealer.
E. The
undamaged fiberglass insulation lining the air handling unit cabinet
panels shall be coated with an antimicrobial protective coating to seal
and preserve the insulation. The EPA
registered antimicrobial coating shall be applied with an airless paint
sprayer to provide a uniform film on the inside of the air handling
unit and return air plenum.
F. After
the coil cleaning procedure and the fan blade cleaning, the coils and
fan blades shall be thoroughly and evenly coated with a fine spray of
coil sanitizer to prevent fungi growth.
G. All
exposed fiberglass insulation found damaged or torn shall be removed
and replaced with IMCOA microbial resistant insulation liner inside air
handling units. The fiberglass insulation on the wet side of the coil shall be replaced with the IMCOA. The
IMCOA microbial resistant insulation liner shall be one (1) inch thick
and meet ANSI/NFPA 90A and 90B flame spread and smoke development
standards. The new insulation shall be pinned and glued to the air handling unit cabinet panels per SMCNA standards.
Variable Air Volume Boxes/Mixing Boxes:
The air side surfaces of
all VAV boxes and mixing boxes where applicable, shall be cleaned,
sanitized and the fiberglass insulation liner coated with an EPA
registered antimicrobial protective coating. The
disassembly of VAV boxes and Mixing Boxes shall be to the extent
necessary to prevent damage to electrical components that cannot be
shielded during the cleaning process and to provide adequate exposure to
surfaces to be cleaned.
Duct Work Cleaning:
A. HEPA
filtered negative air equipment used shall be portable and sized to
easily enter all areas of the building. The air duct cleaning collection
equipment shall be high-powered negative air vacuum systems with the
final filtration stage HEPA filters. The ductwork shall be cleaned one
section at a time. A critical barrier shall be constructed in the ductwork to isolate a section of ductwork to be cleaned. An
ten (10) inch diameter vacuum hose shall be attached to the ductwork
from the negative air vacuum unit to create a negative pressure in the
ductwork relative to the occupied areas of the building. A mechanical,
rotating brush shall be moved through the ductwork to dislodge dirt and
debris from the top, sides and lower surfaces of the ductwork. The loosened debris is then simultaneously collected in the attached negative air collection vacuum.
B. All galvanized air supply, air return, and outside ductwork shall be cleaned to remove all dust, dirt and debris.
C. All
rigid fiberboard and interior fiberglass lined air ductwork shall be
cleaned to remove all dust, dirt and debris. The exposed fiberglass
surfaces shall then be coated with an EPA registered antimicrobial
protective coating applied with airless spray paint equipment.
D. Where
applicable, fresh air intake ductwork and dampers where dirt has
accumulated shall be vacuumed and sanitized with air duct sanitizer.
E. Where
applicable, FIRE AND SMOKE AIR DUCT DETECTOR SENSORS located in supply
or return air ductwork shall be covered to prevent fire alarm activation
and damage. This shall be performed any time ductwork or
air handling units are being vacuumed, sanitized or sprayed with
antimicrobial coating. All covers shall be removed at the end of the day to prevent interference with the operation of the fire alarm system.
F. Reheat
coils shall be vacuumed, cleaned with coil cleaner and rinsed with
clean water to return the coil to proper air flow function.
G. Where
applicable electric duct heaters located in the ductwork at the
discharge of the air handling units shall be HEPA vacuumed.
H. Any return air grille, exhaust air grille or supply air diffuser shall be removed and thoroughly cleaned. After cleaning and drying, the grille or diffuser shall be re-installed.
I. All electrical equipment used by our technicians shall be plugged into extension cords that have ground fault interrupter boxes. Contractor shall insure that all OSHA and EPA requirements that are applicable to this type of project are fully followed. Contractor
shall be responsible for proper disposal of any hazardous materials,
residue or rinse materials in accordance with all applicable local,
state and federal regulations.
J. Contractor shall not use any subcontractors on this project.
K. Contractor
ensures the building owners that all our employees have been trained in
the hazards associated with the microbial and chemical exposures that
may occur on this project and that Contractor has fully ascertained
those potential hazards and provided appropriate personal protection and
work procedures to minimize these exposures for our employees.
L. In
addition, Contractor agrees to be responsible for providing and
requiring the wearing of NIOSH approved N95 half mask respirator that
meets 42CFR84 requirements. The
filters are equipped with a 95% efficient filter and shall be worn at
all times while working inside air handling units and ductwork.
M. Material Safety Data Sheets (MSDS) information and manufacture information forms are provided as part of this Scope of Work. Only products and materials described in this Scope of Work shall be used in the cleaning and decontamination procedures.
