






If you know the length &
width of the attic floor:


OR


If you know the square footage of the attic floor:
















Application: One vent for intake per:




Model

Sq. Feet
of Floor
1/150

Sq. Feet
of Floor
1/300

Net Free
Vent Area
in Sq. Inches

Net Free
Vent Area
in Sq. Feet

SVA10

21

42

10

0.07

SVA20

42

84

20

0.14

SVA30

63

126

30

0.21

SVA40

84

168

40

0.28




















