well-ventilated people

Specifications
Intake Vents

When installed in accordance with manufacturer's recommendations, Air Vent products comply with the net free area requirements of nationally recognized model codes, including those written by BOCA, SBCCI and ICBO.

Here's an overview of the specifications for Air Vent's complete line of intake ridge ventilation products.

Product Model Description Colors Size Net Free Area
The Edge™ Vent EVI Shingle-over, roof-top installed intake vent Black 11.4" x 48" 9 sq. in. per ft.
Continuous
Soffit Vent
SV201 Aluminum
Continuous
soffit vent
(Retrofit)
White,
Mill, Brown
2-3/4" x 96" 9 sq. in. per ft.

SV202 Aluminum
Continuous
soffit vent
(New
Construction)
White,
Mill, Brown
2-3/4" x 96" 9 sq. in. per ft.

SP8 Aluminum
Continuous
soffit vent
(Retrofit)
White,
Mill, Brown
2-3/4" x 96" 8 sq. in. per ft.

SV351 PVC
Continuous
soffit vent
(Retrofit)
White,
Brown
2-3/4" x 96" 9 sq. in. per ft.

SV352 PVC
Continuous
soffit vent
(New
Construction)
White
2-3/4" x 96" 9 sq. in. per ft.
Undereave
Vents
EV16424 Aluminum White,
Mill,
Brown
4" x 16" 28" pc

EV16624 Aluminum White,
Mill,
Brown
6" x 16" 42" pc

EV16824 Aluminum White,
Mill,
Brown
8" x 16" 56" pc
Vented Drip Edge VDE Aluminum White,
Mill,
Brown,
Black
10' 9 sq. in. per ft.

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THE SIMPLE MATHEMATICS OF A BALANCED RIDGE VENTILATION SYSTEM

To determine how many feet of net free area you need, use this formula:

Square feet of attic floor space

300
= Square feet of net free area needed
For example:
1500 square feet of attic floor space

300
= 5 square feet of free area needed

Ridge Vent/Intake Vent Calculator for Standard Gable Attic

To use this calculator, first find the total square footage of the attic floor area. Round your calculations up to the next highest number (see Ventilations Requirements).

Then look across to the number under the Minimum Length of Ridge column. That tells you the total linear feet of ridge vent required using the 1/300 minimum code requirements. Note: because today's tighter homes require more airflow, the 1/150 ratio is also included.

To balance your ridge vent system, find the length of the ridge and follow the column to the right for required intake vents (see Balancing Your Ridge Vent System).

Ventilation Requirements

Attic Square Footage Minimum Length of Ridge
at 1/300 ratio At 1/150 ratio
1200 16 32
1500 20 40
1800 24 48
2100 28 56
2400 32 64
2600 36 72
3000 40 80
3300 44 88

Note: Calculations are based on ShingleVent II and Multi-Pitch FilterVent which provide 18" of net free area per linear foot.

Balancing Your Ridge Vent System

Length of Ridge Linear Feet of
The Edge™ Vent shingle-over intake
Number of Undereave Vents
16" x 8" 16" x 6" 16" x 4"
15' 30 5 6 10
20' 40 6 9 13
30' 60 10 13 19
40' 80 13 17 26
50' 100 16 21 32
60' 120 19 26 39
70' 140 23 30 45
80' 160 26 34 51
90' 180 29 39 58

The Balance System

Note: FHA requirements and most building codes state the minimum required net free area. This minimum ventilation area may not be enough to effectively ventilate the attic to prevent moisture damage and cool the attic enough in the winter to prevent ice dams.

Attic Intake Vents: Continuous Soffit Vents | Undereave Vents | Vented Drip Edge | The Edge™ Vent
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