EN   FR

SUSTAINABLE BUILDINGS

Asset Classes

Focus Area

Indoor Air Quality and Hazards

Topic

Filtration

Question #

I3.1 — Filter Inspection

Question

Are filters in air handling systems inspected/replaced at regular intervals and corrective actions taken when required?

Applicability

Applicable to all buildings (systems or equipment in the owner or landlord’s control)

Answer

Yes or No

Description

Use of ASHRAE Minimum Efficiency Reporting Value MERV 8/8‐A or greater filtration shall be utilized in intermittently occupied areas and used primarily in the protection of HVAC equipment and components only. In regularly occupied areas, a minimum MERV 13/13‐A filter shall be utilized. Pressure gauges shall be used wherever possible to determine the correct change‐out interval of the filters. Filtration of return-air (from systems, such as compartment units, fan-coil units, heat pumps) prevents recirculation of occupant-generated contaminants.

Filtration systems need to be properly maintained in accordance with manufacturers recommendations. Filters should be inspected at least quarterly.

Requirements

  1. All filters to be rated as per ASHRAE 52.2 (latest version)
  2. Confirmation of MERV‐A ratings or equivalent must be in writing
  3. Filters in Constant Velocity systems can be replaced at the manufacturers maximum rated pressure drop providing there is no detrimental effect on air flow. Air filters in VFD systems to be replaced at approximately twice the initial pressure drop to achieve maximum energy savings
  4. Provide filter inspection records and maintenance log showing frequency of inspection and replacements
  5. Outline corrective actions taken or plan to address issues identified

Documentation

  • Filter rating (ASHRAE test reports including Appendix “J” testing or written confirmation from supplier that filters do not decrease in efficiency through their life)
  • Filter replacement schedule
  • Filter inspection records and maintenance log
  • Corrective actions

Adapted BB3 Question

Question 03.04.01 – What MERV filters are in use for all outdoor air and return air (i.e. circulating air) systems? And Question 03.04.03 – Are measures in place to alert building operators that HVAC filtration systems need replacement?

Suggested Lead

In-house

References

Crosswalk

TBD

Other Notes

None

Scoring

3 Points

Verification