CPS IAQPRO SmartAir Manuale d'uso - Pagina 12
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AIR QUALITY (Issues, Causes, Solutions) Cont'd
Indoor Air
Potential Causes
Quality Issues
VOC Contaminants
The U.S. EPA reports
that on average, 60% of
High tVOC Level
VOC's enter the home
through an attached
garage
Mechanical equipment
issues
Insufficient returns
High CO
Level
2
Inadequate ventilation
Negative air pressure in
summer
Negative air pressure
High Or Low
in winter
Building
Positive air pressure in
Pressure
summer
Positive air pressure
in winter
In the summer, conden-
sation forms on ducts,
air diffusers, walls or
High Or Low
ceilings
Dew Point
In the winter, conden-
sation forms inside
exterior walls
12
Recommended Solutions
Remove contaminants inside home or
garage
Improve ventilation inside home or garage
Add garage ventilation fan to exhaust/create
negative pressure
Seal garage/mud door from home
Inspect gas appliances and heaters for leaks
Add or increase size of return registers in
bedrooms
Add ERV (Energy Recovery Ventilation) or
HRV (Heat Recovery Ventilation) to exchange
stale air with fresh air
Inspect windows, doors or other openings in
the building envelope for air leaks
Ensure AC system is proper size (tons) and
functioning properly. Check ductwork or
building envelope for leaks. Determine if
insulation missing
Recommended
Indoor Levels
No federally enforce-
able limits, but 50 ~
325 ppb are thought
to be acceptable, but
recommended to not
exceed 500 ppb.
350-1,000 ppm
is typical level in
occupied spaces with
good air exchange.
Slightly positive
+.02-in. to +.03-in.
WC. can make a
huge difference in
building comfort and
efficiency.
OSHA recommends
24 to 60 °F (−4.5 to
15.5 °C)