Instructions / Assembly

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

Table Of Contents

For a copy of the warranty, contact your local

distributor or visit our website at www.gaf.com

40 YEAR LIMITED WARRANTY

RIDGE VENTS CLASS A CLASSIFIED BY

UNDERWRITERS LABORATORIES INC.

AS TO AN

EXTERNAL FIRE EXPOSURE WHEN INSTALLED IN

ACCORDANCE WITH INSTRUCTIONS PROVIDED

WITH RIDGE VENTS 9M61

File R15072

Made from over

90% recycled fiber;

over 30% post-consumer content.

IMPORTANT: Proper

attic ventilation reduces

moisture build-up

and can prevent

mold growth.

Instructions for

Nail Gun Installation

Cobra

ExhaustVent

Application Instructions

NOTE:

Calculations for a Balanced Ventilation System...

To achieve a “balanced system” with COBRA

EXHAUST VENT, there must be an air intake system (i.e. soffits or

undereave vents). For proper ventilation, the amount of undereave ventilation must equal the amount of ventilation at

the ridge. NO

TE: In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.

• To determine the minimum square feet of net free ventilation area (NFVA) needed for a balanced ventilation system,

use the following formula:

Sq. ft. of attic floor space = Min Sq. ft. of NFVA needed

300

• COBRA

EXHAUST VENT has 16.9 (hand nail) and 14.1 (nail gun) square inches of NFVA per lineal foot.

To determine how many feet of Cobra Ridge Vent is needed, use the following formula:

1/2 x (Min. Sq. ft. of NFVA needed) x 144/16.9 or 14.1 = Min. lineal feet of ridge vent needed

• To determine the amount of undereave vent required, use the following formula:

X = NFVA (Sq. In. per. lin. ft.) of the undereave vent or intake vent system selected

1/2 x (Min. Sq. Ft. of NFVA needed) x 144/X = Min. lineal feet of undereave vent needed

Instructions

for Slots...

Cut a 2” (5.1cm) slot along

ridge, 1” (2.5cm) on each

side. Leave uncut (closed)

sheathing area of 6”

(15.2cm) at each end

of the ridge.

Cut through the sheathing

only, avoiding roof trusses.

(In houses with a ridge

board, cut 3 1/2” (8.9cm)

slot, 1 3/4” (4.4cm)

on each side.)

(Figure A)

Ridge Vent

Installation...

Uncoil COBRA

EXHAUST VENT along

the entire length of the

ridge, covering uncut 6”

(15.2cm) sheathing area

on both ends.

(Figure B)

Shorter lengths can be

joined by caulking and

butting the ends.

(See Inset Figure B)

Cap Shingle

Installation...

Install cap shingles directly over COBRA

EXHAUST

VENT. Use Smart Nails

™

(supplied) on centers

recommended by shingle manufacturer. With nail-gun

version, use enclosed gun adapter and 1 3/4" (4.4cm)

included coil nails.

(Figure C)

Do Not overdrive the Smart Nails

™

Cobra

Exhaust Vent has a 3/4" (2cm) normal thickness

for optimum ventilation. Be sure not to crush or

compact the product during installation.

(Figure D)

Roof Deck:

Use only over a well-seamed, supported wood deck, tightly constructed with maximum 6” lumber, having

adequate nail-holding capacity. Plywood decking as recommended by the American Plywood Ass’n is acceptable.

Slope Restrictions:

Use only on slopes between 2/12 and 20/12

B C

For a copy of the warranty, contact your local

distributor or visit our website at www.gaf.com

40 YEAR LIMITED WARRANTY

RIDGE VENTS CLASS A CLASSIFIED BY

UNDERWRITERS LABORATORIES INC.

AS TO AN

EXTERNAL FIRE EXPOSURE WHEN INSTALLED IN

ACCORDANCE WITH INSTRUCTIONS PROVIDED

WITH RIDGE VENTS 9M61

File R15072

Made from over

90% recycled fiber;

over 30% post-consumer content.

IMPORTANT: Proper

attic ventilation reduces

moisture build-up

and can prevent

mold growth.

Roof Decks:

For use on minimum

(10 mm) plywood or oriented strand board (OSB) decking as recommended by APA -The Engineered

Wood Association. Wood plank decks are also acceptable, but must be well-seasoned and supported having a maximum

" (3 mm)

spacing, using minimum nominal 1" (25.4 mm) thick lumber, a maximum 6" (152 mm) width, having adequate nail-holding capacity

and a smooth surface.

Slope Restrictions: Use only on slopes between 2:12 and 20:12.

Step 1 Step 2

Step 3

Instructions

for Slots

Cap Shingle

Installation

Ridge Vent

Installation

Cut a 2" (51 mm) slot along the ridge,

1" (25.4 mm) on each side. Leave

uncut (closed) sheathing area of 6"

(152 mm) at each end of the ridge.

Cut through the sheathing only,

avoiding roof trusses. (In houses

with a ridge board, cut 3

[89 mm] slot, 1

[44.4 mm]

on each side.) (Figure A)

Uncoil Cobra

Exhaust Vent

along the entire length of the

ridge, covering uncut 6"

(152 mm) sheathing area on

both ends. (Figure B)

Shorter lengths can be joined

by caulking and butting the

ends. (See Inset Figure B)

Install cap shingles directly over Cobra

Exhaust Vent.

Use enclosed 1

" (44.4 mm) coil nails. (Figure C)

Cobra

Exhaust Vent Nail Gun Version has a

(15.9 mm) nominal thickness for optimum ventilation.

Be sure not to crush or compact the product during

installation. (Figure D)

NOTE: Nails must be of sufﬁcient length to penetrate

through plywood and OSB decks or at least

(19.1 mm) into wood planks.

Please Note The Following:

1. When marking off and cutting slot openings, make sure that

the ends of the opening stop at least 6" (152 mm) from any end

walls and at least 12" (305 mm) from hip and ridge intersections

or chimneys.

2. Where short ridges (dormers, ridge intersections) are used, mark

and cut the slot and make sure that the end of the opening stops

at least 12" (305 mm) from the ridge intersection.

3. Do NOT install on hip roofs.

4. For additional protection in high wind areas, a bead of silicone,

rooﬁng cement, or polyurethane rooﬁng sealant can be applied

around the perimeter of the underside of the cap

shingle before fastening on top of Cobra

Exhaust Vent.

Do not use excess rooﬁng cement or polyurethane rooﬁng

sealant, as it may cause blistering of the shingles.

5. For additional protection on installations with extra-thick

shingles, a bead of rooﬁng cement or polyurethane rooﬁng

sealant can be applied to the underside of the outer edge of

the vent along the entire ridge and at exposed edges so that

any large gaps are completely ﬁlled. Do not use excess

rooﬁng cement or polyurethane rooﬁng sealant, as it may

cause blistering of the shingles.

Calculations for a Balanced Ventilation System

To achieve a "balanced system" with Cobra

Exhaust Vent, there must be an air intake system (i.e., sofﬁts, fascia, or undereave

intake vents). For proper ventilation, the amount of intake ventilation must equal the amount of exhaust ventilation at the ridge.

NOTE: In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.

NOTE: Consult local building codes for other ventilation requirements.

To determine the minimum square feet of net free ventilating area (NFVA) needed for a balanced ventilation system,

use the following formula:

Cobra

Exhaust Vent for Nail Gun Installation has 14.1 square inches of NFVA per lineal foot (29,845 mm

of NFVA

per lineal meter). To determine how many feet (meters) of Cobra

Exhaust Vent is needed, use the following formula:

x (min. sq. ft. of NFVA needed) x 144/14.1 = Min. lineal feet of ridge vent needed

To determine the amount of intake vent required, use the following formula:

X = NFVA (sq. in. per lin. ft.) of the intake vent selected

x (min. sq. ft. of NFVA needed) x 144 /X = Min. lineal feet of intake vents needed

x (min. m

of NFVA needed) x 1,000,000/X = Min. lineal meters of intake vents needed

For Roof Ridge

For a copy of the warranty, contact your local

distributor or visit our website at www.gaf.com

40 YEAR LIMITED WARRANTY

RIDGE VENTS CLASS A CLASSIFIED BY

UNDERWRITERS LABORATORIES INC.

AS TO AN

EXTERNAL FIRE EXPOSURE WHEN INSTALLED IN

ACCORDANCE WITH INSTRUCTIONS PROVIDED

WITH RIDGE VENTS 9M61

File R15072

Made from over

90% recycled fiber;

over 30% post-consumer content.

IMPORTANT: Proper

attic ventilation reduces

moisture build-up

and can prevent

mold growth.

(15.9 mm)

x (min. m

of NFVA needed) x 1,000,000/29,845 = Min. lineal meters of ridge vent needed

X = NFVA (mm

per lin. m) of the intake vent selected

Sq. ft. of attic ﬂoor space = Min. sq. ft. of NFVA needed

300

NOTE: Unless used in conjunction with Cobra

Hip Vent, for ridge vent to function properly, it should be the only exhaust vent for

the vented attic space. However, if the ridge vent is being used in conjunction with a hip vent, the total exhaust NFVA should match

the total intake NFVA for the vented attic space. Do not use with gable-end or roof louvers, wind turbines, solar or powered vents,

or other exhaust vents.

Summary of content (3 pages)

PAGE 1
Cobra ExhaustVent Application Instructions ® Instructions for Nail Gun Installation For Roof Ridge Roof Decks: For use on minimum 3/8" (10 mm) plywood or oriented strand board (OSB) decking as recommended by APA-The Engineered Wood Association. Wood plank decks are also acceptable, but must be well-seasoned and supported having a maximum 1/8" (3 mm) spacing, using minimum nominal 1" (25.4 mm) thick lumber, a maximum 6" (152 mm) width, having adequate nail-holding capacity and a smooth surface.
PAGE 2
Cobra ExhaustVent Application Instructions ® Cubiertas de techos: Instrucciones para la instalación con pistola de clavos Para cumbreras de techos Para usar en cubiertas de madera contrachapada o panel de fibra orientada (OSB) de 3/8" (10 mm) de mínimo, según lo recomendado por APA - The Engineered Wood Association.
PAGE 3
Cobra ExhaustVent Application Instructions ® Platelages de toit : Instructions pour l’installation de la cloueuse Pour ligne de faitage À utiliser un contreplaqué ou des panneaux à copeaux orientés (OSB) au minimum de 10 mm (3/8 po) tel que recommandé par l’PA (Engineered Wood Association).