SUSTAINABLE BUILDINGS
Asset Classes
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Offices
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- Not applicable
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Enclosed Shopping Centres
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- Not applicable
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Open Air Retail
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Light Industrial
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- Not applicable
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Multi-Unit Residential Buildings
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Health Care Facilities
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Universal
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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
All asset classes
Owner/landlord occupied building
Tenant occupied building – systems managed by the owner/landlord
Answer & Scoring
- Yes = 3 points
- No = 0 points
- Not applicable – Tenant occupied building: No systems managed by the owner/landlord = 0/0
Max of 3 points
Requirements
- All filters to be rated as per ASHRAE 52.2 (latest version)
- Confirmation of MERV‐A ratings or equivalent must be in writing
- Filters in constant velocity systems can be replaced at the manufacturer’s maximum rated pressure drop providing there is no detrimental effect on air flow. Air filters in Variable Frequency Drive (VFD) systems to be replaced at approximately twice the initial pressure drop to achieve maximum energy savings
- Provide filter inspection records and maintenance log showing frequency of inspection and replacements
- 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
- Evidence that corrective actions have been completed
Suggested Lead
In-house
Value
- Filters are used in HVAC systems to trap air contaminants such are dust, pollen, and mold spores to ensure that clean air is provided to indoor spaces
- Filters have a MERV rating that reflects the filter’s efficacy. The higher the MERV rating, the smaller particulates the filter can capture
- Filters can become clogged quickly with particulates. Frequently inspect filters to determine when filters need to be replaced
- Replace filters are found in poor condition as soon as possible to prevent poor air quality
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.
References
Adapted BB 3.0 Question
Question 03.04.01 – What MERV filters are in use for all outdoor air and return air (i.e. circulating air) systems?
Question 03.04.03 – Are measures in place to alert building operators that HVAC filtration systems need replacement?