HVAC Cleaning

Clean HVAC Improves Building Health and Performance

PURE-Steam is a comprehensive indoor air quality and energy efficiency forward solution. In fact, it is the only Green Clean Institute certified process of its kind in North America. It is unique from legacy-type coil cleaning services, in part because the PURE-Steam process goes beyond other HVAC cleaning methods' one-size fits all approach. With PURE-Steam, your facilities' HVAC equipment life, system energy efficiency and AHU hygiene can all be addressed as part of your routine preventative maintenance plan.

The PURE-Steam Process

PURE-Steam uses proprietary processes and HVAC coil cleaning equipment that operates at temperatures up to 350° F. These temperatures and the strict process driven approach provide disinfection of the coils and AHUs, effectively killing bacteria and fungi (mold) to remove allergen triggers and musty odors.

PURE-Steam also deeply cleanses at up to 350 psi, pushing dust and debris completely through the coil to improve airflow, hygiene, static pressure and thermal transfer for real operational savings. The recommended preventative maintenance is performed biannually depending on building type, size, and use.

How HVAC Steam Cleaning Works

Depending on where the AHU is located, we choose and deploy the specific equipment required for a job. Then, as a professional mechanical contractor, we shut down the unit following all lockout and tag-out procedures. If the AHU is in a mechanical room, a containment area is established to prevent steam and moisture from affecting the indoor environment. Next, all electrical components and ducts are masked to keep them dry.

WTI/Pure Air Control Services performs our own proprietary Coil Cleanliness Verification Test (CCVT). This test is repeated across the span of the coils, measuring the Delta P (ΔP) to determine which zones of the coil are most fouled. This is helpful to report the coil’s current condition, as well as letting the tech know which areas of the coil will require the most attention. The data is logged and then cleaning commences.

The entire interior of the AHU is first HEPA vacuumed, then a pre-steam enzyme treatment is applied to the coils. Next, the interior is steam cleaned top to bottom and the coils are worked with a precise method to ensure all debris is dislodged from deep inside. Water extraction is maintained throughout the service. If necessary, the coils can be flushed with clean water at 50 gallons a minute. Another CCVT is performed to report the results. If an area still shows signs of fouling, it’s reworked until it’s clear. Finally, a post-steam bioactive treatment is applied to inhibit microbial growth for up to a year.

After the job is completed, a detailed Measurement and Verification (M&V) Report is provided for each AHU that was cleaned with PURE-Steam. This report not only contains before and after performance data recorded with the CCVT, but also includes a QA checklist of the job specification, a complete photo log, and recommendations for any additional issues that might still need to be addressed. This valuable, proprietary, report is a useful archive to track historical data on the equipment.