Install Instructions

1. The MINIMUM ventilation requirement is calculated using ASHRAE
62.2-2010.
ASHRAE Airflow in CFM = [House Area in Sq. Ft. x 0.01] +
[(Number of Bedrooms +1) x 7.5]
NOTE: Use ‘Number of Bedrooms + 1’ or ‘Number of Occupants’,
whichever is larger.
2. Table 2 shows the calculated airflow values to the nearest 5 CFM.
3. Record the required CFM. ________
Measure the outdoor air flow (CFM) through the duct that is bringing in only outdoor air. Use the CFM Delivered along with the CFM required to
find the Cycle Time per hour setting from Table 3. For example if the ventilator is providing 120 CFM, and the requirement is 70 CFM, set the
time to 35 minutes.
TABLE 3 – Cycle Time Setting (minutes) for Airflow Delivered vs. Airflow Required for 1 Hour Cycle
CFM Delivered
CFM Required
20 30 40 50 60 70 80 90 100 110
60
20 30 40 50 60
80
15 25 30 40 45 55 60
100
15 20 25 30 35 40 50 55 60
120
15
15 20 25 30 35 40 45 50 55
140
15
15 15 20 25 30 35 40 45 50
160
15 15
15 20 25 25 30 35 40 45
180
15 15
15 20 20 25 30 30 35 40
200
15 15 15
15 20 25 25 30 30 35
220
15 15 15 15
20 20 20 25 30 30
TABLE 2 – CFM Required
House Sq. Ft.
Number of Bedrooms
2 3 4 5 6 7
1000
35 40 50 55 65 70
1500
40 45 55 60 70 75
2000
45 50 60 65 75 80
2500
50 55 65 70 80 85
3000
55 60 70 75 85 90
3500
60 65 75 80 90 95
4000
65 70 80 85 95 100
4500
70 75 85 90 100 105
5000
75 80 90 95 105 110
DETERMINE VENTILATION REQUIREMENTS
CALCULATING AIRFLOW REQUIREMENT
DETERMINE OUTDOOR AIR (CFM) DELIVERY RATE
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