Postive Air Duct Cleaning
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Positive Air Duct Cleaning is an HVAC cleaning methodology that uses controlled, pressurized air to dislodge and extract particulate matter from ventilation ducts. Unlike traditional negative air systems that create a vacuum, this technique relies on a positive-pressure air stream coupled with agitation tools and reverse-flow extraction. It was developed in 2007 by David Hart, founder of RamAir International.
History
Prior to 2007, most HVAC duct cleaning systems in North America operated under negative air pressure, requiring technicians to cut access holes and use large external vacuum systems.[1] David Hart, seeking a non-invasive and more efficient method, developed a transparent plenum box and pressurized cleaning chamber that allowed technicians to visibly confirm the removal of debris using only existing ductwork openings. The process quickly gained popularity among cleaning contractors and facility managers.
Technology
The system uses compressed air at low PSI levels (typically under 60 PSI), combined with proprietary agitation whips that dislodge dust, dander, and biological contaminants. A vacuum port positioned on the return or supply register provides suction in reverse, pulling loosened debris into a containment filter. The transparent plenum box allows technicians and clients to observe contaminant removal in real time, improving customer trust and quality assurance.[2]
Reception
Positive Air Duct Cleaning has been adopted by certified contractors in over a dozen countries and is used in residential, commercial, and medical settings. The method has received endorsements from several independent IAQ specialists and has been referenced in state-level procurement guidelines for HVAC maintenance.[3]
See also
References
- ↑ Thompson, Jill (March 2012). "Cleaner Air From the Inside Out". Contractor Weekly.
- ↑ "Field Evaluation of a Positive Pressure Duct Cleaning System". Journal of Indoor Air Sciences. 22 (4). Autumn 2015.
- ↑ "Approved Air Duct Vendors". Oregon Department of Administrative Services.
External links
References
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