Ventilation Calculator

How to Calculate

Step 1: Measure

Measure the length and width of the attic floor space to be ventilated.

Step 2: Calculate

Enter the length and width or the total square footage of the attic floor space to be ventilated.
Check Mark in Badge Icon

Step 3: Identify

See recommended quantities below for each GAF Ventilation Product (typically rounded up).

Let’s get started

Use this calculator to help determine the proper amount of attic ventilation based on U.S. FHA 1/300 guidelines.*

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Enter your measurements below.
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Or

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Suggestions for 900 sq. ft. Area

Numbers shown represent the recommended total number of units required for a single product.
384 Minimum Sq. In. of Net Free Area of exhaust needed at or near the ridge.
And
384 Minimum Sq. In. of Net Free Area of intake needed at or near the soffit.

Please Note:

Some local building codes require the 1/150 attic ventilation rule, which increases the minimum attic ventilation needed. Always consult local building code requirements in your area for details.
Note: N/R = not recommended

Exhaust Ventilation

Product Lineal Feet Required
Cobra® RidgeRunner® 31'
Cobra® Rigid Vent 3 22'
Cobra® SnowCountry® 22'
Cobra® SnowCountry® Advanced 22'
Cobra® Hip Vent 43'
TruSlate® Ridge Vent 43'

Product

Cobra® RidgeRunner®

Lineal Feet Required

31'

Product

Cobra® Rigid Vent 3

Lineal Feet Required

22'

Product

Cobra® SnowCountry®

Lineal Feet Required

22'

Product

Cobra® SnowCountry® Advanced

Lineal Feet Required

22'

Product

Cobra® Hip Vent

Lineal Feet Required

22'

Product

TruSlate® Ridge Vent

Lineal Feet Required

22'

Product Lineal Feet Required
Cobra® Exhaust Vent - Hand Nailable 31'
Cobra® Exhaust Vent - Nail Gunnable 22'

Product

Cobra® Exhaust Vent - Hand Nailable

Lineal Feet Required

31'

Product

Cobra® Exhaust Vent - Nail Gunnable

Lineal Feet Required

22'

Product Lineal Feet Required
AR10 31'

Product

AR10

Lineal Feet Required

31'

Product Number Required
RT65 Plastic Square - Top 31
IR61 Plastic Slant - Back 31
R50/RV50 Metal Utility 31
IR65 Plastic Slant - Back 31
SSB960 Metal Super Slant - Back 31
HCD144 High-Capacity Dome Vent 31

Product

RT65 Plastic Square - Top

Number Required

31

Product

IR61 Plastic Slant - Back

Number Required

31

Product

R50/RV50 Metal Utility

Number Required

31

Product

IR65 Plastic Slant - Back

Number Required

31

Product

SSB960 Metal Super Slant - Back

Number Required

31

Product

HCD144 High-Capacity Dome Vent

Number Required

31

Intake Ventilation

Product Lineal Feet Required
Cobra IntakePro® 31'

Product

Cobra IntakePro®

Lineal Feet Required

31'

Product

Cobra® Fascia Vent (Mesh Roll) 1"

Lineal Feet Required

22'

Product

Cobra® Fascia Vent (Mesh Roll) 1.5"

Lineal Feet Required

22'

Product Number Required
LSV8 Metal Continuous Soffit Vents (Lineal Feet) 31'
EAP 4x12 Plastic Soffit Vents 31
EAC 16x4 Metal Soffit Vents 31
EAC 16x8 Metal Soffit Vents 31
EmberShield® Closeable Soffit Vents 31

Product

LSV8 Metal Continuous Soffit Vents

Number Required

31

Product

EAP 4x12 Plastic Soffit Vents

Number Required

22

Product

EAC 16x4 Metal Soffit Vents

Number Required

22

Product

EAC 16x8 Metal Soffit Vents

Number Required

22

Product

EmberShield® Closeable Soffit Vents

Number Required

22

Intake or Exhaust Ventilation

Note: Gable louvers are typically installed in pairs

Product Number Required
DA 12x12 31
DA 12x18 31
DA 14x24 31
DA 18x24 31
DA 24x30 31

Product

DA 12x12

Number Required

31

Product

DA 12x18

Number Required

31

Product

DA 14x24

Number Required

31

Product

DA 18x24

Number Required

32

Product

DA 24x30

Number Required

33

Product Number Required
SL 8x8 31
SL 12x12 31
SL 12x18 31
SL 18x24 31

Product

SL 8x8

Number Required

34

Product

SL 12x12

Number Required

35

Product

SL 12x18

Number Required

36

Product

SL 14x24

Number Required

37

Product

SL 18x24

Number Required

38

Product Number Required
RLSC 2" 31
RLSC 3" 31
RLSC 4" 31

Product

RLSC 2"

Number Required

39

Product

RLSC 3"

Number Required

40

Product

RLSC 4"

Number Required

41

Exhaust Ventilation

Product Number Required
ERV4 31
ERV5 & Wi-Fi ERV5QCT 22
ERV6 22
EZ Cool EZCR1 22

Product

ERV4

Number Required

31

Product

ERV5 & Wi-Fi ERV5QCT

Number Required

22

Product

ERV6

Number Required

31

Product

EZ Cool EZCR1

Number Required

31

Product Number Required
EGV5 & Wi-Fi EGV5QCT 31
EGV6 22
EZ Cool EZCG1 22

Product

EGV5 & Wi-Fi EGV5QCT

Number Required

31

Product

EGV6

Number Required

31

Product

EZ Cool EZCG1

Number Required

31

Product Number Required
Solar & Dual-Powered Roof (ERVSOLAR / ERVHYBRID) 31
Solar-Powered Gable (PGSOLAR) 22
High-Power Solar & Dual-Powered Roof (PRSOLAR2 / PRHYBRID2) 22

Product

Solar & Dual-Powered Roof (ERVSOLAR / ERVHYBRID)

Number Required

31

Product

Solar-Powered Gable (PGSOLAR)

Number Required

31

Product

High-Power Solar & Dual-Powered Roof (PRSOLAR2 / PRHYBRID2)

Number Required

31

Product Number Required
12" 31
14" 22

Product

12"

Number Required

31

Product

14"

Number Required

31

Intake Ventilation

Product Lineal Feet Required
with ERV4 31'
with ERV5 & Wi-Fi ERV5QCT 22'
with ERV6 31'
with EZ Cool EZCR1 31'
with EGV5 & Wi-Fi EGV5QCT 22'
with EGV6 31'
with EZ Cool EZCG1 31'
with Solar & Dual-Powered Roof 22'
with Solar-Powered Gable 22'
with High-Power Solar & Dual-Powered Roof 22'
with 12" Wind Turbine 22'
with 14" Wind Turbine 22'

Product

with ERV4

Lineal Feet Required

31'

Product

with ERV5 & Wi-Fi ERV5QCT

Lineal Feet Required

31'

Product

with ERV6

Lineal Feet Required

31'

Product

with EZ Cool EZCR1

Lineal Feet Required

31'

Product

with EGV5 & Wi-Fi EGV5QCT

Lineal Feet Required

31'

Product

with EGV6

Lineal Feet Required

31'

Product

with EZ Cool EZCG1

Lineal Feet Required

31'

Product

with Solar & Dual-Powered Roof

Lineal Feet Required

31'

Product

with Solar-Powered Gable

Lineal Feet Required

31'

Product

with High-Power Solar & Dual-Powered Roof

Lineal Feet Required

31'

Product

with 12" Wind Turbine

Lineal Feet Required

31'

Product

with 14" Wind Turbine

Lineal Feet Required

31'

Product Lineal Feet Required
with ERV4 31'
with ERV5 & Wi-Fi ERV5QCT 22'
with ERV6 31'
with EZ Cool EZCR1 31'
with EGV5 & Wi-Fi EGV5QCT 22'
with EGV6 31'
with EZ Cool EZCG1 31'
with Solar & Dual-Powered Roof 22'
with Solar-Powered Gable 22'
with High-Power Solar & Dual-Powered Roof 22'
with 12" Wind Turbine 22'
with 14" Wind Turbine 22'

Product

with ERV4

Lineal Feet Required

31'

Product

with ERV5 & Wi-Fi ERV5QCT

Lineal Feet Required

31'

Product

with ERV6

Lineal Feet Required

31'

Product

with EZ Cool EZCR1

Lineal Feet Required

31'

Product

with EGV5 & Wi-Fi EGV5QCT

Lineal Feet Required

31'

Product

with EGV6

Lineal Feet Required

31'

Product

with EZ Cool EZCG1

Lineal Feet Required

31'

Product

with Solar & Dual-Powered Roof

Lineal Feet Required

31'

Product

with Solar-Powered Gable

Lineal Feet Required

40'

Product

with High-Power Solar & Dual-Powered Roof

Lineal Feet Required

31'

Product

with 12" Wind Turbine

Lineal Feet Required

31'

Product

with 14" Wind Turbine

Lineal Feet Required

31'

Product Number Required
with ERV4 31
with ERV5 & Wi-Fi ERV5QCT 22
with ERV6 31
with EZ Cool EZCR1 31
with EGV5 & Wi-Fi EGV5QCT 22
with EGV6 31
with EZ Cool EZCG1 31
with Solar & Dual-Powered Roof 22
with Solar-Powered Gable 22
with High-Power Solar & Dual-Powered Roof 22
with 12" Wind Turbine 22
with 14" Wind Turbine 22

Product

with ERV4

Number Required

31

Product

with ERV5 & Wi-Fi ERV5QCT

Number Required

31

Product

with ERV6

Number Required

31

Product

with EZ Cool EZCR1

Number Required

31

Product

with EGV5 & Wi-Fi EGV5QCT

Number Required

31

Product

with EGV6

Number Required

31

Product

with EZ Cool EZCG1

Number Required

31

Product

with Solar & Dual-Powered Roof

Number Required

31

Product

with Solar-Powered Gable

Number Required

49

Product

with High-Power Solar & Dual-Powered Roof

Number Required

31

Product

with 12" Wind Turbine

Number Required

31

Product

with 14" Wind Turbine

Number Required

31

Product Number Required
with ERV4 31
with ERV5 & Wi-Fi ERV5QCT 22
with ERV6 31
with EZ Cool EZCR1 31
with EGV5 & Wi-Fi EGV5QCT 22
with EGV6 31
with EZ Cool EZCG1 31
with Solar & Dual-Powered Roof 22
with Solar-Powered Gable 22
with High-Power Solar & Dual-Powered Roof 22
with 12" Wind Turbine 22
with 14" Wind Turbine 22

Product

with ERV4

Number Required

31

Product

with ERV5 & Wi-Fi ERV5QCT

Number Required

31

Product

with ERV6

Number Required

31

Product

with EZ Cool EZCR1

Number Required

31

Product

with EGV5 & Wi-Fi EGV5QCT

Number Required

31

Product

with EGV6

Number Required

31

Product

with EZ Cool EZCG1

Number Required

31

Product

with Solar & Dual-Powered Roof

Number Required

31

Product

with Solar-Powered Gable

Number Required

58

Product

with High-Power Solar & Dual-Powered Roof

Number Required

31

Product

with 12" Wind Turbine

Number Required

31

Product

with 14" Wind Turbine

Number Required

31

Product Number Required
with ERV4 31
with ERV5 & Wi-Fi ERV5QCT 22
with ERV6 31
with EZ Cool EZCR1 31
with EGV5 & Wi-Fi EGV5QCT 22
with EGV6 31
with EZ Cool EZCG1 31
with Solar & Dual-Powered Roof 22
with Solar-Powered Gable 22
with High-Power Solar & Dual-Powered Roof 22
with 12" Wind Turbine 22
with 14" Wind Turbine 22

Product

with ERV4

Number Required

31

Product

with ERV5 & Wi-Fi ERV5QCT

Number Required

31

with ERV6

Number Required

31

with EZ Cool EZCR1

Number Required

31

with EGV5 & Wi-Fi EGV5QCT

Number Required

31

with EZ Cool EZCG1

Number Required

31

with Solar & Dual-Powered Roof

Number Required

31

with Solar-Powered Gable

Number Required

67

with High-Power Solar & Dual-Powered Roof

Number Required

31

with 12" Wind Turbine

Number Required

31

with 14" Wind Turbine

Number Required

31

Product Number Required
with ERV4 31
with ERV5 & Wi-Fi ERV5QCT 22
with ERV6 31
with EZ Cool EZCR1 31
with EGV5 & Wi-Fi EGV5QCT 22
with EGV6 31
with EZ Cool EZCG1 31
with Solar & Dual-Powered Roof 22
with Solar-Powered Gable 22
with High-Power Solar & Dual-Powered Roof 22
with 12" Wind Turbine 22
with 14" Wind Turbine 22

Product

with ERV4

Number Required

31

Product

with ERV5 & Wi-Fi ERV5QCT

Number Required

31

Product

with ERV6

Number Required

31

Product

with EZ Cool EZCR1

Number Required

31

Product

with EGV5 & Wi-Fi EGV5QCT

Number Required

31

Product

with EGV6

Number Required

31

Product

with EZ Cool EZCG1

Number Required

31

Product

with Solar & Dual-Powered Roof

Number Required

31

Product

with Solar-Powered Gable

Number Required

75

Product

with High-Power Solar & Dual-Powered Roof

Number Required

31

Product

with 12" Wind Turbine

Number Required

31

Product

with 14" Wind Turbine

Number Required

31

Diagram of intake and exhaust ventilation

The 1/300 balanced attic ventilation rule

Proper attic ventilation consists of a balance between air intake (at or near your soffits) and air exhaust (at or near your roof ridge). The U.S. Federal Housing authority recommends a minimum of 1 square foot of attic ventilation (evenly split between intake and exhaust) for every 300 square feet of attic floor space. Always have a balanced ventilation system. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.
*Note: The 1/300 rule is a general rule and does not apply to all situations. Local building codes, when stricter, take precedence. Always consult a design professional for cathedral ceilings, insulated roof decks, etc.
Examples of static, power, and mechanical attic vents

Learn about attic vent options

Are you confused about the many attic ventilation solutions available? Curious why one roof would get ridge ventilation and another would incorporate power vents or a roof louver? Watch this video for a great introduction to the art and science of choosing the right attic ventilation components for your roof.

Your top attic ventilation questions answered

Image showing why you should use attic ventilation

How to Ventilate an Attic - How Attic Ventilation Works | GAF Roofing

What is attic ventilation? Learn how attics are ventilated.

How to Select Products for Your Attic Ventilation System | GAF Roofing

Determine which ventilation products are best for your roofing project.

How to Plan a Balanced Attic Ventilation System | GAF Roofing Materials

In this video, you will learn how to calculate a balanced attic ventilation system.

How to Avoid Common Attic Ventilation Installation Mistakes | GAF Roofing

When planning and installing a balanced attic ventilation system, it is important to understand and avoid these common mistakes that may reduce the effectiveness of the system.

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