1	"Presented by" Presented by John Gayetsky, CIAQP Engineer & Industrial Hygienist Ohio Department of Health
2	"Examine the basis for HVAC..." Examine the basis for HVAC & IAQ rules Explain the application of HVAC & IAQ rules to real-world inspection situations Explore common HVAC system configurations, components and deficiencies Identify proven O & M strategies for controlling & preventing common HVAC/IAQ problems
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5	07(A)(15)(a) HVAC systems shall have the thermostatic controls set to operate the fan continuously during occupied periods.
6	07(A)(15)(b) HVAC systems shall not have any excessive noise, vibration or odor from any system component.
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8	07(A)(15)(c) HVAC systems shall not have any suspected mold or other debris on any system component.
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11	07(A)(15)(d) HVAC systems shall have air filtration media in central air handling units and unit ventilators with a Minimum Efficiency Rating Value (MERV) of seven or greater.
12	07(A)(15)(e) HVAC systems shall have unobstructed air supply grilles or outlets and air return grills or inlets with no rigged baffles, deflectors or barriers affixed.
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15	07(A)(15)(f) HVAC systems shall provide adequate ventilation to prevent reasonable health complaints and to remove or dilute contaminants within the capacity of the system.
16	6.14.3 Indoor CO2 concentrations should not exceed 700 ppm above the outdoor ambient level.
17	07(A)(16) School environmental health and safety inspections may include assessment of temperature and relative humidity which should be kept within the capacity of the heating, ventilating and air conditioning system installed in the building, in accordance with Appendix A of this rule.
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19	Continuous Path There must be a continuous path from outdoors to outdoors for ventilation to occur
20	Continuous Path
21	Blocked Intake Grille Common practice after oil embargo in 1972 Easy to identify Removal could make big difference in IAQ
22	Blocked OA Intake Screen Hard to see Purpose is to prevent bird, rodent, and big debris entry Often clogged with small debris
23	Clogged Air Filters Extended-area filters are better Preventive maintenance schedule is important
24	A Fundamental Question… Does indoor air quality matter if you’re not alive to breathe it?
25	Safety Hazards High voltage Motors, belts, and pulleys Slips, Trips & Falls
26	Closed dampers In addition to a chunk of 2x4 jammed against the damper, there are several others reasons that the damper may be closed
27	Disconnected Linkages Due to breakage or corrosion, or in an attempt to save energy ($)
28	Uncalibrated Time Clocks 24 hour and weekly styles Power-outages, daylight savings time, and others can cause OA to be OFF when needed, and ON when not
29	Minimum Settings Dictates minimum outdoor air damper position % OA doesn’t mean much
30	No Air Pressure Compressed air sent throughout the building to control OA supply Popular in pre-1980s buildings
31	Defective Freeze-Stats Problems include defective operation, and inappropriate use of manual-reset freeze-stats
32	Clogged Heating & Cooling Coils Primarily results from use of cheap air filters, improper installation of air filters, and improper cleaning or replacement of air filters
33	Clogged Blowers Especially in unit ventilators, trash can clog the air blowers
34	Burned-Out Fan Motor Motor may be burned-out, or could be wired backwards causing the blower to run in reverse
35	Blocked Supply Grille Tops of unit ventilators often used as storage space Sometimes purposely blocked due to discomfort or noise
36	Blocked Transfer Grilles Part of unit ventilator and exhaust-only systems Sometime contain fire dampers which have been triggered (closed)
37	Blocked Transfer Paths Most pre-1970s schools had various forms of air transfer paths out of occupied areas Most transfers have been defeated by fire marshalls
38	Continuous Path 4 potential exhaust choke-points for outdoor air supply
39	Blocked Exhaust Intakes and Ducts Note the disconnected exhaust duct
40	Broken Fan or Belt Preventive maintenance is important for belts
41	Fans Turned Off Check the breaker panel inside the building, and the disconnect next to the fan
42	Blocked Exhaust Outlets Why would someone do this?
43	Finally??? We completed the path from outdoors-to-outdoors, so the outdoor air supply is now adequate, right?!
44	Educate Others Example: Path is complete, but occupants turn unit off due to noise or discomfort
45	Airflow Measurement You can’t look and guess at the amount --- IT MUST BE MEASURED ! Don’t expect 15 CFM per person
46	"Indoor Environments Section" Indoor Environments Section Ohio Department of Health www.odh.ohio.gov (614) 466-1390