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Indoor Air Quality

Wednesday, February 24, 2016

Indoor air quality (IAQ) is a major concern for offices, hospitals, medical offices, schools, building managers, tenants and workers because it can impact the health, comfort and productivity of the building occupants.


OSHA Publication 3420-04 is the first OSHA standard set forth by OSHA and the US Department of Labor.

The following checklist can be used my building owners and others to investigate the
HVAC system to make sure it is operating properly.


Cooling Towers

  • Written maintenance and inspection program
  • Operated in accordance with manufacturer specifications
  • Inspect regularly
  • Treatment of waste to control microorganisms
  • Record use of biocides


Cooling Coils

  • Written maintenance and inspection program.
  • Monthly (or, as required) inspections during operation.
  • Removal of dirt, slime, and mold, as required.
  • Upstream filters operating properly.
  • Drain Pans, Drainage systems
  • Written maintenance and inspection program.
  • Monthly inspection (or, as required).
  • Drains maintained in free-flowing condition.
  • No accumulation of stagnant water.
  • No buildup of slime, mold, or dirt.
  • Removal of dirt, slime, and mold, as required.
  • Sample water for microbes, as required.


Duct and Plenum Equipment

  • Written inspection and maintenance program.
  • Supply, exhaust, return grilles, and ducts clear and clean.
  • Routine inspection of ducts, debris, and microbial growth (e.g., semi-annually).
  • Provisions of cleanout (e.g., within four feet downstream of duct expansions, supply air openings, or where particulate deposition may occur).
  • Ductwork attached, not dented.
  • Insulation intact, not wet, and no microbial growth.
  • Ductwork properly balanced.
  • Filtration systems
  • Written maintenance, operating, and inspection programs.
  • Routine inspection.





W.O. Blackstone offers a full range of professional mechanical contracting services for clients in the commercial office, healthcare, institutional and industrial markets in South Carolina, North Carolina, and Georgia.

Since 1937, W.O. Blackstone has been about the business of helping building owners, general contractors, property managers and design engineers provide effective solutions for HVAC and Plumbing systems and Industrial Process Piping.. For more information, please visit www.woblackstone.com or contact us at (803) 252-8222.




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