HVAC Air Filter Audit

HVAC Air Filter Audit

Scope of Audit: To determine the energy requirements, useful life, and particle capture percentage of air filters within an HVAC system for the purpose of verifying filter performance or to objectivley compare multiple air filter options.

Why Do This Audit: Filter manufacturers and distributors promise long life, low energy use, low airflow resistance, and superior particulate removal. These claims are largely based on laboratory testing and ASHRAE even states the limitations of lab testing, including the ability to re-create “real world” conditions with test dust, in their standard 52.2-2012. This audit provides objective data to analyze how filters are performing within an HVAC system in their normal every-day use.

Testing Procedures:

  • Audit Period – The audit will start when new air filters are installed in the HVAC system(s) selected and continue until the filters have reached end of life.
  • Energy – Intermediate testing of the static pressure drop and VFD output, if applicable, across the filter bank will be done to determine the load the filters are putting on the HVAC system.
  • Useful Life – Visual inspections will be done to ensure filter integrity is maintained so there is no bypasss around or between filters. End of life will be determined by one of the following:
    • Manufacturer’s prescribed final static pressure
    • End-User defined static pressure limit – i.e. double the initial as recommended by ASHRAE
    • Preventive Maintenance Schedule set by the end-user
    • Structural failure of the filter(s)
  • Particulate Efficiency – Upstream and downstream particle counts will be done throughout the audit period to track particulate efficiency during use. ASHRAE 52.2-2012 mentions some air filter media lose efficiency while in use. Filter(s) may be sent to an ASHRAE 52.2 testing facility as well.

The final report generated will be the property of Filtration Systems, Inc. and one or multiple copies will be made available to the organization who participated in the audit and will be supplied at the discretion of Filtration Systems, Inc. Agreement to participate in the Audit does not include any commitment for the participating organization to purchase any products or additional services from Filtration Systems, Inc.

Replacement UV-C lights:

When a UVC bulb is used for 1 year, the output drops by 15%, after 18 months the output drops by 25%, and if left in for 2 years the output is reduced by half or more.  What’s disappointing is some companies will warrant their UVC light for 2 years, and while techinically the light will still shine and there will be some output the facts are the facts (and over 90% of the bulbs are made by 1 manufacturer).  We recommend replacing the bulbs every 12-18 months.  Replacement UV-C parts we offer:

  • UVC lights
  • Ballasts
  • Tombstones
  • Fixtures
  • “On” indicators (so you don’t have to rish exposure to see if it’s working)

Upper Air Irradiation:

First used nearly 100 years ago Upper-Air UVGI is a proven way to reduce the presence of airborne pathogens.  It is so effecitve that indpendant studies show it to remove over 98% of the Influenza Virus from a room that uses Upper Air UVGI.  Like the rest of these systems costs have come down and fixtures are treating bigger areas making inital costs lower than they’ve ever been for this technology.

Surface Decontamination:

Also growing in popularity, howver most of these systems are sold in the form of a UV robot and cost between $50,000 and $150,000 each.  We are able to offer you the surface decontamination you need at significantly lower cost.  Because of the nature of the UV robot, there is also significant shadowing so often times it is recommended to purchase TWO of them to do an adequate job – again our method all but eliminates shadowing ensureing proper application of UV-C light to the surfaces that need to be decontaminated.