👉NADCA: Introduction to HVAC System Cleaning
👉NADCA: HVAC Inspection Manual
👉NADCA: White Paper on Chemical Applications in HVAC Systems
HVAC CLEANING PROCEDURE
Although air duct systems may vary throughout the country, a typical job would work as follows:
1) Turn the system on
to make sure it is operating properly.
Once you determine that
everything is operating fine, turn the system off.
2) The furnace filter
is removed, wrapped in plastic, and reinstalled to separate the supply and
return sides of the system.
3) An 8” and 12”
access hole is then cut into the main trunk line near the plenum. A zone bag is then inflated in the duct
between the access hole and the plenum.
This helps insure a strong vacuum and a good negative pressure on the
system.
4) Install the duct
mounting flange over the access hole and attach the flex duct with a quick
connect clamp. The other end of the flex
duct will be attached to your Nikro Portable Air Duct Cleaner. Turn the machine on.
5) Now that the
system is running and under negative pressure, go to each register and seal
them off with plastic sheets or foam blocks.
This will increase your air velocity.
NOTE: If you are cleaning a large home, the use of more than one zone
bag may be necessary to better manage the air flow.
6) Starting from the
furthest register, you will clean each branch line by using nylon duct brushes,
cable driven brushes, or forward air blast assemblies to loosen debris to the
main trunk line, where it will be vacuumed out by your Nikro Air Duct
Cleaner. The process is then repeated at
each register. Once all the branch lines
have been cleaned, you will then clean out the main trunk line.
7) Once the supply
side has been thoroughly cleaned, repeat steps 3 through 6 on the return side.
8) Now that the duct
system has been cleaned, you can clean the A-coils and the blower.
9) After the system
has been cleaned an EPA registered air duct sanitizer may be applied. While the system is still under negative
pressure, the sanitizer is sprayed into each register with an Ultra Low Volume
(ULV) Fogger.
10) Once the system
has been thoroughly cleaned and sanitized, reseal all access holes with metal
patches, then reinstall all registers.
*** The National Air Duct Cleaners Association (NADCA) recognizes the “Source Removal” method as the only acceptable way to properly clean and decontaminate air duct systems. Although duct cleaning is a fairly routine process, it does involve knowledge of the duct system and it’s various components. Conventional air duct systems consist of a supply and a return. The supply ducts of an HVAC system supplies heated or cooled air from the air handler to a main “trunk” line. The main trunk line carries the air to smaller “branch” lines which then distributes the air to various locations throughout the home.
OPTIONAL SERVICES:
FILTER REPLACEMENT: Many air duct cleaners offer filter replacement to their customers - replacing the less efficient fiberglass filters with a high efficiency pleated or an electrostatic filter. This will dramatically reduce dust build-up inside the air ducts.
DRYER VENT CLEANING: Dryer vent cleaning is often overlooked. By having their dryer vents cleaned, your customers will reduce drying time and save on utility bills. The customer may also be eliminating a potential fire hazard.
NOTE: THE PROCEEDING INFORMATION IS ONLY A BRIEF OVERVIEW OF THE AIR DUCT CLEANING PROCESS. IT IS NOT INTENDED TO BE USED FOR TRAINING. ANY TECHNICIAN PERFORMING AIR DUCT CLEANING SHOULD HAVE A COMPLETE UNDERSTANDING OF THE AIR HANDLING SYSTEM AND THE AIR DUCT CLEANING PROCESS.
NIKRO INDUSTRIES, INC.
1115 N. ELLSWORTH VILLA PARK, IL
60181 TOLL FREE: 800-875-6457 www.nikro.com
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