Ventilation Cleaning

Agency: City of Asheville
State: North Carolina
Type of Government: State & Local
NAICS Category:
  • 238220 - Plumbing, Heating, and Air-Conditioning Contractors
  • 561720 - Janitorial Services
  • 561790 - Other Services to Buildings and Dwellings
Posted Date: May 3, 2019
Due Date: May 23, 2019
Solicitation No: 298-MuniVentilation14units-IFB
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bid number description bid deadline addendums

Ventilation Cleaning

Invitation for Bids

Mandatory Pre-Bid Meeting at 1:30pm on 5/8/19;

Bids due by 2pm, 5/23/19

None at this time

Attachment Preview

Invitation for Bids
Ventilation Cleaning
Caution: The only official source for this document is the one cited in the advertisement. Not getting
this document directly from that source could mean that this document has been superseded by a
later version. Only those requesting this document from the advertised source will be included on a
mailing list for updates. The Owner is not responsible for any reader’s failure to heed this warning.
Invitation for Bids (IFB)
The City of Asheville will receive bids for the following:
Bid Number: 298-MuniVentilation14units-IFB
Bid Due Date and Time: 5.23.2019 2pm
Bids Shall Be Delivered To: Amanda van Roekel
City of Asheville
Capital Projects Department
Asheville, NC 28802
City of Asheville
Ventilation Cleaning
A pre-bid conference will be held on 5.8.2018 1:30pm at Municipal Building at 100 Court Plaza.
Attendance at the pre-bid conference is mandatory.Building ventilation plans found at this link.
Description of Work:
Minimum Requirements
The following sections outline the provisions to be performed by a certified mold remediation
1. Submit a MSDS sheet to GICC LLC of any substitute products for approval prior to
product use. MSDS sheet(s) will be stamped by this office if approved.
2. Submit proof of acceptance of the substitute product by the jurisdiction having authority,
be it State, Federal or Local.
3. Submit any EPA registration number(s) of the substitute product.
4. Product of base specification is “Benefect” antimicrobial solution.
Because of the nature of the HVAC system, and its function of recycling and redistributing air
throughout the building, we recommend the commercial duct cleaning protocol we put together
be administered; this protocol will follow the Site Specific section. It is a useful guide that can be
used in accordance with the NADCA ACR-2013 Commercial Duct Cleaning Standard. Any
HVAC contractor performing the cleaning of the units in question must follow this Standard.
Since mold is involved, during the removal process of the affected cabinets, the following PPE
provisions will be required:
1. PPE in accordance with the IICRC S-520 2nd Edition Standards. This includes, at
a minimum:
• A respiratory program in accordance with OSHA Standard 29 CFR
1910.134 or ANSI Z88.2 (full face respirators with HEPA/organic paper
• OSHA's eye and face protection regulations in 29 CFR 1910.133 (already
accounted for with full face respirators).
• Protective gloves.
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Invitation for Bids (IFB)
City of Asheville
Ventilation Cleaning
• Tyvek suits.
Affected HVAC units (including but not limited to Units 2-15):
1) Fiber based insulation on interior (of all units, contaminated or not), shall be removed and
replaced with a non-porous, preferably rubber-based insulation material with an antimicrobial
2) All contaminated units’ interior cabinet shall be steam cleaned & disinfected to remove
microbial growth. This includes the blower wheels, coils, etc. (do not use a coil cleaner that is
3) All duct lines connected to each unit shall be disconnected as needed and have their interiors
gently cleaned for their entire length,
taking special care not to disrupt interior linings. Also, Fan Coil Units should be inspected and
cleaned on
an ‘as needed’ basis.
4) Fogging the ductwork with Benefect as the final step (with the fan running to pull it through
the system) is required.
HEPA air scrubbers must be in place during the remediation process, and ducted
to the exterior if possible; this applies to areas where decontamination is
underway. In this case, the HVAC rooms should be contained and under negative
pressure via air scrubbers, while contaminated materials are being dislodged and
aerosolizing the spores to prevent cross-contamination.
PPE as per the level of contamination shall be in order. OSHA Level C in this
case. If questions arise about this please consult GICC LLC for details.
All material(s) removed from the site may be disposed of in the local landfill.
There are no “hazardous material” provisions in effect on this project.
Products specified herein are for reference only. Products of other manufacturers
may be used upon approval by GICC LLC.
If hidden contamination is discovered during the remediation process, GICC
LLC shall be notified before work proceeds. This will enable GICC LLC to
determine the nature and extent of the contamination and the methodology
needed to affect proper remediation.
Guidelines for Remediation Contractor Qualifications:
1. Remediation contractor and on-site supervisor shall be a Certified Mold Remediation
Specialist as designated by the IAQA, IICRC, or an organization having equal standards.
2. A minimum of $1,000,000 of pollution liability insurance and $1,000,000 of excess
liability must be held by the contractor.
3. Remediation contractor shall be familiar with and use IICRC S520 2nd Edition “Standard
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Invitation for Bids (IFB)
City of Asheville
Ventilation Cleaning
and Reference Guide for Professional Mold Remediation” as the “Standard of Care”
when conducting remediation of any project unless otherwise instructed by the IEP
(Indoor Environmental Professional).
4. A warning sign that reads “Do Not Enter – Microbial Remediation Underway – Personal
Protective Equipment Required” shall be placed on any entrance to the remediation
5. Remediation workers shall wear PPE (personal protective equipment) based on IICRC
S520 2nd Edition criteria as per Condition Level. OSHA Level C in this case. Full-face
respirators must in accordance with regulations set by OSHA Standard 29 CFR 1910.134
and all workers must be properly fit tested.
6. A respiratory protection program shall include the changing of the HEPA filter cartridges
at the beginning of each work shift, or at a minimum of eight (8) hours, whichever time
period is less. Workers shall also wear disposable hooded suits over their clothing.
Clearance testing criteria:
1. Visual inspection to verify all previously damaged materials have been removed.
2. Air sampling to ensure the levels of airborne spores have been reduced to “acceptable
limits” in comparison to the initial sampling results and in the context of the current
3. Direct contact (surface) sampling from materials and surfaces where previous visible
mold growth was evident to verify adequate remediation has taken place.
Sequence for Cleaning and Decontaminating
Commercial Ductwork
1. All work shall be conducted on an OFF HOURS basis and shall be coordinated with the
designated site supervisor. Work may alternately be conducted if the section of the building
being worked on is unoccupied and sealed off from occupied sections of the building.
2. Take any fans on energy scheduling systems off those scheduling systems and allow then
to run 24 hours except when ductwork is being cleaned.
3. Clean the outside air intake grill and shaft if one is present.
4. Clean the return air ducts starting at the outer ends of the return air system and concluding
at the mixed air chamber and the exhaust stack if these components are present.
5. Clean the interior of the air handler. Remove and replace interior insulation at this time.
6. Install products in compliance with the manufacturer's instructions.
7. Pre-vacuum diffusers, grills and registers in the ductwork. If necessary, remove,
chemically wash/clean and reset. Any diffusers that are rusted, pitted, corroded or otherwise
unacceptable shall be replaced with new ones.
8. Existing ductwork and insulation shall be neatly cut as required to provide access to
facilitate cleaning of the ductwork and components. As necessary, protect downstream areas
from receiving particulates during the installation of access points.
9. Install vacuum collector unit at predetermined location and clean the section of ductwork
using omni directional air nozzles and rotary brushes as necessary. Large crawlable ducts
may be hand vacuumed or brushed and air washed.
10. Clean the supply ductwork starting from the supply fan and ending at the supply diffuser.
page 3 of 20
Invitation for Bids (IFB)
City of Asheville
Ventilation Cleaning
At no point should un-cleaned ductwork be upstream from clean ductwork.
11. Location of access holes and openings shall be approved by the Owner’s designated
12. Existing duct access panels shall be used wherever possible.
13. Upon completing the cleaning operation, the round access openings shall be plugged air-
tight with plastic caps designed for this purpose.
14. The rectangular duct access openings shall be closed using an overlapping piece of
galvanized sheet metal, or material to match the existing ductwork. The cover shall be of the
same gauge thickness as the existing ductwork. Rectangular covers shall be fastened using
self-tapping sheet metal screws with a silicone head sealing gasket; or 3M No. 1202-t sealant
tape used as a sealing gasket, at the perimeter of the cover(s). Seal all joints air-tight.
15. Where ducts are provided with exterior insulation, neatly cut and remove insulation as
required to accommodate required duct access holes and openings. When complete,
reinsulate ducts at access points and install new vapor barrier to match the existing ones.
16. Visually inspect the duct interior prior to cleaning each duct section. Use a fiber-optic
bore scope to accomplish the inspection task for all smaller ducts not otherwise accessible. A
self feeding mini camera may be used if one is available.
17. Wash and vacuum clean each duct section.
Lined ducts:
Air pressure wash and vacuum or rotary brush and vacuum. The cleaning process shall not
degrade the fiberglass insulation. Damaged insulation will be replaced or repaired at the
discretion of the remediation contractor.
• Fog the interior of the ductwork with a suitable anti-microbial and allow to dry.
• Upon completion of the cleaning of each fiberglass lined duct section, seal the surface
of the fiberglass lined duct with Foster 40/20 or an approved encapsulant.
Unlined ducts:
Air pressure wash and vacuum or rotary brush and vacuum. Hand wipe or hand vacuum if
space allows. Fog the interior of the ductwork with an approved anti-microbial and allow
18. Visually inspect each duct section using a borescope where necessary, to ensure the duct
section is clean.
19. All registers, grills and diffusers shall be removed, vacuum cleaned, washed and then
reinstalled. Any diffusers that are rusted, pitted, corroded or otherwise unacceptable shall be
replaced with new ones.
20. After all ductwork has been completely cleaned and sanitized, a final visual inspection
shall be accomplished with the Owner’s designated representative for conditional approval.
At this time, the Environmental Consultant shall take samples for mold contamination. The
cleaning will receive final approval if the total fungal counts have been abated or have fallen
page 4 of 20

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