11
Envirowise 70V Installation Instructions
Option 1: Calculating Airflow Requirement Using ASHRAE 62.2-2013 Airflow Equation
ASHRAE Airflow in CFM = [House Area in Sq.Ft. x 0.03] + [(Number of Be1) x 7.5]
NOTE: Use ‘Number of Be 1’ or ‘Number of Occupants’, whichever is larger.
Example 1: Number of Be 1
1800 square foot house with 3 bedrooms, 4 occupants = [1800 X 0.03] + [(3+1) X 7.5] = 84 CFM
Example 2: Number of Occupants
1800 square foot house with 3 bedrooms, 5 occupants = [1800 X 0.03] + [5 X 7.5] = 91.5 CFM
Record the required CFM ____________
SET UP AS A DEHUMIDIFYING VENTILATOR
Determine Ventilation Requirements
The MINIMUM ventilation requirement is calculated using ASHRAE 62.2-2013. Use one or both of the options
below to determine your ventilation requirement. Follow all local and national building and safety codes.
Option 2: Calculating Airflow Requirement Using Table 4.1 from ASHRAE 62.2-2013
See chart below to find the calculated airflow values to the nearest 5 CFM.
Record the required CFM ____________
Table 4.1 from ASHRAE 62.2-2013
Floor Area
(ft
2
)
< 500
501-1000
1001-1500
1501-2000
2001-2500
2501-3000
3001-3500
3501-4000
4001-4500
4501-5000
1
30
45
60
75
90
105
**
**
**
**
2
38
53
68
83
98
113
**
**
**
**
3
45
60
75
90
105
120
**
**
**
**
4
53
68
83
98
113
128
**
**
**
**
5
60
75
90
105
120
**
**
**
**
**
Number of Bedrooms
Ventilation Air Requirements, CFM
** VENTILATION VALUES
ARE OUT OF THE
OPERATING RANGE OF
THE 70V
