ASDHRAE's suggested cubic feet per minute of fresh air ventilation
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ASDHRAE's suggested cubic feet per minute of... Expand / Collapse
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Posted 5/21/2009 9:19:05 AM Post #1169
 

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Table 4.1 a(I-P)

Ventilation Air Requirements, cfm

Floor Area

Bedrooms

(ft^2)

0-1

1-2

4-5

6-7

>7

<1,500

30

45

60

75

90

1,501-3,000

45

60

75

90

105

3,001-4,500

60

75

90

105

120

4,501-6,000

75

90

105

120

135

6,001-7,500

90

105

120

135

150

>7,500

105

120

135

150

165

Excerpted from: ANSI/ASHRAE Standard 62.2-2-2004

Pounds per hour of moistureremoved or added to the home

with <50%RH @ 74^F with fresh air ventilation

^F Outdoor Dew Points

30

40

50

60

70

80

CFM of

Grains of moisture in a lb. of outdoor air

Fresh Air

24

36

53

78

111

156

30

-0.5

-0.3

0.0

0.5

1.1

1.9

45

-0.8

-0.5

0.0

0.7

1.6

2.8

60

-1.1

-0.6

0.0

0.9

2.1

3.8

75

-1.3

-0.8

0.0

1.1

2.7

4.7

90

-1.6

-0.9

0.0

1.4

3.2

5.7

105

-1.9

-1.1

0.0

1.6

3.7

6.6

120

-2.1

-1.2

0.0

1.8

4.3

7.6

135

-2.4

-1.4

0.0

2.1

4.8

8.5

150

-2.7

-1.6

0.0

2.3

5.3

9.5

165

-2.9

-1.7

0.0

2.5

5.9

10.4

180

-3.2

-1.9

0.0

2.8

6.4

11.4

195

-3.5

-2.0

0.0

3.0

6.9

12.3

210

-3.7

-2.2

0.0

3.2

7.5

13.2

Pounds of moisture per hour of moistureremoved/added

to <50%RH @ 74^F with fresh air ventilation

This is chart used to estimate ASHRAEs recommended fresh air  moisture load or drying of fresh air.  The attachment shows all the details.

Thank you for your interest. Ken

  Post Attachments 
CFM fresh air_lbs moisture hour.pdf (3 views, 32.23 KB)

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