Brochure

13
Helping
Homeowners
Educating homeowners on the need to
exchange air will help them understand
that whole home ventilation is far more
effective than portable units. Whole
home ventilation is quieter, has a higher
capacity, and is more cost-effective.
Signs That A House
Needs Ventilation
• Excessive dust
(house under negative pressure)
• Overly humid
• Lingering odors from cooking
ASHRAE STANDARD 62.2 FOR VENTILATION
ASHRAE Standard 62.2 “defines the roles of and minimum requirement for mechanical
and natural ventilation systems and the building envelope intended to provide acceptable
indoor air quality (IAQ) in low-rise residential buildings.” (ASHRAE 62.2)
SIZING A VENTILATION SYSTEM
ACCORDING TO ASHRAE 62.2:
According to ASHRAE Standard 62.2,
the required amount of outdoor air to be
continuously introduced into the home is:
Qfan= 0.01Afloor + 7.5(Nbr + 1)
Where:
Qfan = fan flow rate, CFM
Afloor = floor area, ft2
Nbr = Number of bedrooms;
not to be less than 1
All Resideo ventilation controls have built in programming to ventilate according to ASHRAE 62.2,
making it easy to meet this code and pass inspection.
VENTILATION FOR ASHRAE 62.2 MAY BE MET BY
ANY OF THE FOLLOWING:
Exhaust Ventilation
• Negative pressure draws fresh air from an unknown source
• Fresher air may come though structure, garage, etc.
• Must have make-up air for combustion products
Supply Ventilation
• Positive pressure pushes stale air out of the home
• Fresher air enters home from a known source
• Fresher air can be conditioned before entering the living space
• Stale air may pass though the structure
Balanced Ventilation
• Net zero pressure differential in home
• Outdoor air comes from a known source
• Fresh air can be conditioned before entering the living space
There are also provisions in ASHRAE 62.2 that allow ventilation to be
delivered on a non-continuous basis, providing maximum output at a
fraction of the time. ENERGY STAR, Environments for Living (EFL), and
many ventilation codes in the US and Canada require homes to install
ventilation per the ASHRAE 62.2 Standard.
Table 4.1a (IP)
Floor Area (ft
2
)
Bedrooms
01 23 45 67 >7
< 1500 30 45 60 75 90
1501 - 3000 45 60 75 90 105
3001 - 4500 60 75 90 105 120
4501 - 6000 75 90 105 120 135
6001 - 7500 90 105 120 135 150
> 7500 105 120 135 150 165