Operating Guide

ManualsBrandsGAF ManualsHeating, Ventilation, and Air ConditioningCobra 10-1/2 in. x 20 ft. Ridge Low Profile Exhaust Vent in Black

Proper attic ventilation consists of a balance between air intake (at

your eaves or soffits) and air exhaust (at or near your roof ridge).

The Federal Housing Administration recommends a minimum of at

least 1 square foot of attic ventilation (both intake and exhaust) for

every 300 square feet of attic space.

GAF Cobra

and Master Flow

Ventilation Products offer a wide

array of effective ventilation solutions, including attic, whole house,

and foundation ventilation. In addition, Cobra

and Master Flow

ventilation products are backed by GAF, North America’s largest

roofing and ventilation manufacturer, and have even earned the

Good Housekeeping Seal!**

So, to help eliminate hassles and deliver long-lasting ventilation per-

formance, select two of the industry’s most trusted ventilation brands,

Cobra

and Master Flow

, for your next home ventilation project.

Cobra

is one of the most trusted brands in attic ventilation...

protecting over 2 million homes since 1991! Offering a wide array

of high-performance ridge and intake venting solutions for virtually

any climate, Cobra

products are designed with the contractor

in mind. From the unique EasyTear

™

Sizing Feature (available on

Cobra

plastic vents) to the Smart Nail

™

Fasteners (available on

Cobra

Exhaust Vent), Cobra

products help ensure a fast, easy

installation. Cobra

Attic Ventilation Products are part of the GAF

Lifetime Roofing System and are covered by up to a Lifetime ltd.

Warranty.* They’ve even earned the Good Housekeeping Seal!**

A leading brand in the roofing industry for off-ridge ventilation...

Master Flow

Attic Ventilation includes a complete line of roof

louvers, turbines, intake vents, electric vents, and innovative

Green Machine

™

solar-powered vents. From extra-wide nailing

flanges and pre-drilled fastener holes to 100% factory-tested motors,

contractors and property owners alike can be confident in their

long-term performance and reliability. Plus, they’re backed by GAF,

North America’s Largest Roofing Manufacturer, and have also

earned the Good Housekeeping Seal!**

** Cobra

and Master Flow

Attic Ventilation products have

earned the prestigious Good Housekeeping Seal, which

means that Good Housekeeping stands behind these

products. (Refer to Good Housekeeping Magazine for

its consumer protection policy. Applicable in U.S. only.)

Cobra

and Master Flow

Attic Ventilation Products offer a wide array of solutions designed

for virtually any climate and provide excellent resistance against rain and snow infiltration!

Table Of Contents

Ridge Ventilation Pages 4–7

Hip Ventilation Pages 8–9

Power Attic Ventilation Pages 10–11

Solar-Powered Vents Pages 12–15

Roof & Gable Louvers Pages 16–19

Turbines Pages 20–21

Intake Ventilation Pages 22–25

Safety Caps For Chimneys Pages 26–27

Whole House Fans Pages 28–29

Foundation Ventilation Pages 30–31

Other Roof Accessories/ Pages 32–35

Roof Accessories – Specifications

Contains Recycled Content

Solar-Powered

Ventilates without any

External Power Source

Ventilates without any

External Power Source

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Solar-Powered

Ventilates without any

External Power Source

Ventilates without any

External Power Source

Contains Recycled Content Solar-Powered Ventilates without any

External Power Source

Contains Recycled Content

Solar-Powered

Ventilates without any

External Power Source

Ventilates without any

External Power Source

Contains Recycled Content

Solar-Powered

Ventilates without any

External Power Source

Ventilates without any

External Power Source

Contains Recycled Content Solar-Powered Ventilates without any

External Power Source

Contains Recycled Content

Solar-Powered

Ventilates without any

External Power Source

Ventilates without any

External Power Source

Contains Recycled Content

Solar-Powered

Ventilates without any

External Power Source

Ventilates without any

External Power Source

Contains Recycled Content Solar-Powered Ventilates without any

External Power Source

Contains recycled content

Ventilates without the need for any external power

Solar-powered – runs off the sun instead

of electricity

Attic Ventilation Is Good Business Practice

Step 1 Calculate attic square footage

How:

Multiply length of attic (in feet) times width of

attic (in feet)

30' x 40' = 1,200 square feet

Step 2 Calculate NFA (Net Free Area) needed for this attic by

using the "1 in 300" rule

How: Divide attic square footage by 300

1,200 sq. ft. ÷ 300 = 4 square feet of NFA needed

Step 3 Convert square feet of NFA to square inches

How:

Multiply square feet of NFA by 144

4 sq. ft. x 144 = 576 square inches of NFA needed

Step 4 Split the amount of NFA needed equally between the

intake and the exhaust

How: Divide square inches of NFA needed by 2

576 sq. in. ÷ 2 = 288 square inches of NFA

needed equally for exhaust & intake

Step 5 Calculate number of feet of Cobra

Exhaust Vent

(Hand Nail)

How: Divide the square inches of NFA needed at

the ridge by the NFA of the Cobra

Exhaust Vent

(Cobra

Exhaust Vent is 16.9 sq. inches of NFA

per

lineal foot)

288 sq. in. ÷ 16.9 = 17 lineal feet

This attic requires 17 lineal feet of Cobra

Exhaust Vent to meet

the “1 in 300” attic ventilation rule

Calculating How Much Ventilation to Install:

Remember: Always have a balanced ventilation system. In no case

should the amount of exhaust ventilation exceed the amount of

intake ventilation.

* Calculations are based on 1 square foot of net free ventilating opening for every 300 square feet

of insulated ceiling with a vapor barrier. Some building codes require 1:150 if there is no vapor

barrier. Always consult local building codes for other ventilation requirements.

Example: Calculating the number of lineal feet of Cobra

Exhaust

Vent (Hand Nail) needed for a 30’ x 40’ attic:

Install industry-leading Cobra

and

Master Flow

Attic Ventilation products

to ensure a continuous flow of outside air

through the attic, help lower living space

temperatures, protect the roof structure,

and potentially help to lower the home’s

energy bills.

Attic

Ventilation Calculator

Energy Efficiency

GAF offers a wide array of energy-saving ventilation

solutions that cool your attic while helping reduce the use

of precious natural resources. Use these helpful icons below,

found throughout the brochure, to help select the right

ventilation option to meet your needs:

* See GAF Shingle & Accessory Ltd. Warranty for complete coverage and restrictions. The

word “Lifetime” means as long as the original individual owner(s) of a single-family detached

residence [or the second owner(s) in certain circumstances] owns the property where the

shingles and accessories are installed. For owners/structures not meeting the above criteria,

Lifetime coverage is not applicable. Lifetime ltd. warranty on accessories requires the use of at

least three qualifying GAF accessories and the use of Lifetime Shingles.