Required Ventilation - Greenheck ASSURE-120S-S1 Installation, Operation And Maintenance Manual

Required Ventilation

ASHRAE
• ASHRAE 62.2-2019 is a national standard that provides methods for achieving acceptable indoor air quality in typical
residences. It was developed and is maintained by the American Society of Heating and Air-Conditioning Engineers (ASHRAE).
• This standard recommends Dwelling-Unit Ventilation, which is a mechanical exhaust system, supply system, or combination
thereof.
Formula Method
The Building Ventilation rate is determined based on the floor area and the number of bedrooms, as defined in Section 4.1.1 equation
4-1a.
Formula:
(Square feet x 0.03) + (bedrooms + 1) x 7.5 = 97.5
(2000 X 0.03) + (4+1) X 7.5 = 97.5
Table Method
Example: a 2000 square foot building with 4 bedrooms from Section 4.1.1 Table 4-1a, a quick reference table predicts 98 cfm. The
following table complies with ASHRAE Standard 62.2-2019, Section 4.1.1 Table 4-1a, Continuous Whole-Building Ventilation rate in
cfm.
Floor Area
(Square Feet)
<500
501 - 1000
1001 - 1500
1501 - 2000
2001 - 2500
2501 - 3000
3001 - 3500
3501 - 4000
4001 - 4500
4501 - 5000
®
Table 5. Whole Building Ventilation Air Requirements
1 2
CFM CFM
30 38
45 53
60 68
75 83
90 98
105 113
120 128
135 143
150 158
165 173
For more information about ASHRAE, go to: https://www.ashrae.org.
Number of Bedrooms
3
CFM
45
60
75
90
105
120
135
150
165
180
4
CFM
53
68
83
98
113
128
143
158
173
188
Residential Energy Recovery Ventilators
5
CFM
60
75
90
105
120
135
150
165
180
195
9