THE DUCTMASTERS DIFFERENCE
1. A full service, competent state licensed, experienced air-conditioning contractor that can clean, service, sell and install all major brands of air-conditioners.
2. We have the specialized equipment to inspect your duct-work and if it needs cleaning we would recommend to clean it before installing a new air-conditioner or before moving into your new home.
3. We are an Florida Power & Light Company Participating Independent Contractor for Air-Conditioning and Duct Repairs, so we can get you the qualifying rebates.
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DUCT CLEANING SOURCE REMOVAL PROCEDURES
1. High Efficient Particle Arrestance (HEPA) respirators will be worn by all personnel in the work area.
2. We turn off the air handler unit.
3. Protective covering will be place over the floor near the work area to ensure that debris does not leave the work area. HEPA filtered negative air vacuum collection system(s) [DUCTMASTERS DUCT VAC(s)] will be positioned as near as possible to the air distribution system(s) with a large vacuum hose attached to the supply plenum, at the air handler, or to any area accessible to the supply trunk duct line.
4. The technicians will then proceed to remove all diffusers (grills or vent covers) to be washed clean and sanitized, they will cover the supply vent openings with foam pads, isolating one section at a time for cleaning.
5. We turn on the DUCT VAC and an accelerated amount of air is moved through the air duct system in the reverse (opposite) direction than is typical under normal air-conditioning conditions.
6. With the isolated section of the air duct system under negative pressure we insert a duct cleaning rotary brush through each duct. Typically, we start from the farthest point away from the DUCT VAC and work our way back toward it. The rotary brush loosens up the dirt, debris and other contaminants, stuck to the walls of the duct, up which the DUCT VAC collection system will vacuum.
7. After the dust and debris is removed from the air duct system, an Environment Protection Agency ( E.P.A.) Registered sanitizing agent called Oxine or Envirocon is fogged throughout the system. This product upon contact kills immediately any fungus and bacteria that may be left in the duct system. One hour after its application the sanitizing agent evaporates without leaving a toxic residue.
8. We turn off the DUCT VAC 3000 and we then remove the suction hose from the supply plenum.
9. The air return grills and supply plenums(s) are manually cleaned with a portable HEPA vacuum equipment and sanitized.
10. We will seal the duct opening access after cleaning and treating, using plates and access doors with duct sealer and foil tape and mesh on exterior insulation.
11. The air handler cabinet is cleaned, evaporator coils are cleaned in place (if accessible), the blower wheel is removed and cleaned, then we sanitize the entire unit.
12. We install all the cleaned supply diffusers.
13. We turn on and inspect the system for proper air flow.
14. The work area is then cleaned and all site debris is removed.
15. The technician will then review the “POST-CLEANING CONSUMER CHECKIST” with the customer.
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Maybe this can help in your assessment of which systems needs cleaning it's the 2005 National Air duct cleaning guidelines.
NADCA Standard ACR 2005
Assessment, Cleaning, and Restoration of HVAC Systems (ACR 2005) is an industry standard that has evolved from guidelines, standards, and research originating from the US National Air Duct Cleaners Association (NADCA) and other organisations dedicated to HVAC system hygiene, remediation and restoration.
This standard establishes criteria for:
- Evaluating the cleanliness of HVAC systems
(ie. When to inspect and what to inspect?)
- Recommended schedule for conducting HVAC system cleanliness inspections
- Recommended list of HVAC system components to be inspected
- Cleaning and restoring HVAC systems to a hygienic state
(ie. When to clean?)
- Conditions that require the cleaning of the HVAC system
- Verifying that acceptable cleanliness levels have been achieved
(ie. How clean is "clean"?)
- Method 1 - Visual Inspection (Primary Method)
- Method 2 - Surface Comparison Testing
- Method 3 - NADCA Vacuum Test
HVAC System Cleanliness Inspection
HVAC inspections must be a part of a building's overall Indoor Air Quality management programme. HVAC systems should be routinely inspected for cleanliness by qualified personnel in accordance with the following Schedule:
When to Inspect?
| Building Use Classification |
Air Handling Unit |
Supply Ductwork |
Return Ductwork/Exhaust |
| Industrial |
1 year |
1 year |
1 year |
| Residential |
1 year |
2 years |
2 years |
Light Commercial
(up to 10 tons/4,000 CFM ) |
1 year |
2 years |
2 years |
Commercial
(above 10 tons/4,000 CFM) |
1 year |
2 years |
2 years |
| Healthcare |
1 year |
1 year |
1 year |
| Marine |
1 year |
2 years |
2 years |
The HVAC system cleanliness inspection should include the following list of components:
What to Inspect?
| Air Handling Units |
Supply Ductwork |
Return Ductwork |
Air Filters
Cooling Coils
Condensate Pan
Condensate Drain Lines
Fan |
Ductwork
Dampers
VAV Boxes |
Ductwork
Dampers
Plenums |
Conditions Requiring Cleaning
When to Clean?
HVAC Systems should be cleaned when an HVAC cleanliness inspection indicates that:
- The HVAC system is contaminated with a significant accumulation of particulate or microbial growth
- The HVAC system performance is compromised due to contamination build-up
Source: National Air Duct Cleaners Association (NADCA)
Please feel free to contact our NADCA Certified Air System Cleaning Specialists if you are interested in having your HVAC System inspected or cleaned to improve Ventilation System Hygiene and Indoor Air Quality in your building or facility.
Productively yours,
Roger M. Herde',
Mechanical Engineer
DUCTMASTERS, INC.
3644 NW 16 Street
Fort Lauderdale, Florida 33311
voice: (954) 791-4111
fax: (954) 581-0450
email: ductmasters@hotmail.com
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