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Specifications
Ridge Vents

When installed properly, all Air Vent products mentioned here comply with the net free area requirements of nationally recognized model codes, including those written by the International Code Council. In addition, the vents have product evalutation approvals from Dade County, Florida, ICC and TDI.

Please call 1-800-AIR-VENT to obtain code body information for a particular Air Vent product.

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

View the wide range of colors in which our products are available in our color chart.

Product	Model	Description	Colors	Size	Net Free Area
ShingleVent II	SHFV203, 12" wide	Shingle-over ridge vent	Black, Brown, Gray, Charcoal	4'	18 sq. in. per ft.
ShingleVent II-9	SHFV209, 9" wide	Shingle-over ridge vent	Charcoal	4'	16 sq. in. per ft.
ShingleVent II-7	SHFVII-7, 7" wide	Shingle-over ridge vent	Charcoal	4'	16 sq. in. per ft.
ShingleVent II-9A	CLASH9CC, 9" wide	Shingle-over ridge vent	Charcoal	4'	16 sq. in. per ft.
ShingleVent II-7A	CLASH7CC, 7" wide	Shingle-over ridge vent	Charcoal	4'	16 sq. in. per ft.
Multi-Pitch FilterVent	FV101	Aluminum ridge vent	Black, Brown, White, Gray, Mill, Bronze, Zinc, Copper	10'*	18 sq. in. per ft.
	FV110	Aluminum ridge vent	Black, Brown, White, Gray, Mill, Bronze, Zinc, Copper	8'*	18 sq. in. per ft.
VenturiVent Plus	VVP	Shingle-over ridge vent	Black	4'	18 sq. in. per ft.
VenturiVent Plus™ with Nails NEW!	VVPN	Shingle-over ridge vent with a bag of 30 3-inch ring shank nails taped to each 4-foot piece.	Black	4'	18 sq. in. per ft.
Peak FilterVent	PVF152	Aluminum peak vent for contemporary roof designs	Black, Brown, Gray, Bronze	Venting Pack	9 sq. in. per ft.
Flash FilterVent	FFV162	Aluminum vent for roof/wall junctions	Black, Brown, Gray, Bronze, Copper	Venting Pack	9 sq. in. per ft.
Utility FilterVent	UFV172	Aluminum vent for specialty applications	Black, Brown, Gray, Bronze	Venting Pack	9 sq. in. per ft.
Tile/Shake FilterVent	TFV111	Adapters cover ends of tile, shake or metal roofs available for all FilterVent products	Black, Brown, White, Gray, Mill	Venting Pack	18 sq. in. per ft.

Venting packs contain four pieces plus two end plugs, three connector plugs and straps. Flash FilterVent includes four pieces of Supplemental Flashing.
Note: Venting packs can be shipped UPS, except Zinc and Copper.
* Also available in venting packs.

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THE SIMPLE MATHEMATICS OF A BALANCED RIDGE VENTILATION SYSTEM

• According to most building codes, you need 1 square foot of ventilation for every 150 square feet of attic floor space.
• For new home construction that includes a vapor retarder, the minimum is 1 square foot of ventilation for every 300 square feet of attic floor space.
• If your vents are split between ridge vents and intake vents, the minimum requirement is also 1 square foot of ventilation for every 300 square feet of attic floor space.

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 are a needed

To determine how many feet of ShingleVent® II, Multi-Pitch FilterVent® or VenturiVent Plus™ you need, use this formula:

1/2 net free area x 144 ÷ 18 = feet of ridge vent needed

For example: 2.5 (based on net free area of 5 square feet) x 144 ÷ 18 = 20 feet of ridge vent needed

To determine how many feet of Air Vent soffit vents you need, use this formula:

1/2 net free area x 144 ÷ 9 = feet of soffit vent needed

For example: 2.5 (based on net free area of 5 square feet) x 144 ÷ 9 = 40 feet of soffit vent needed

The following charts may be used to:

1. Determine how much net free area is needed to satisfy FHA requirements.

2. Balance your ridge vent system.

DETERMINING VENTILATION REQUIREMENTS

Attic Square Footage	Min. Net Free Area Required (if balanced between intake and exhaust)		Min Length of Ridge
1200 1500 1800 2100 2400 2600 3000 3300	4' 5' 6' 7' 8' 9' 10' 11'	576" 720" 864" 1008" 1152" 1296" 1440" 1584"	16' 20' 24' 28' 32' 36' 40' 44'

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

INSTALLING A BALANCED RIDGE VENT SYSTEM

• Measure the square footage of the attic (length x width).
• Measure the length of the ridge.
• Refer to the chart above for required net free area and minimum length of ridge for attic square footage.
• Note: In most cases, the length of the ridge balanced with the same net free area of intake vents will satisfy FHA minimum standards and most building codes.
• Use the chart below to calculate the amount of intake vents that should be installed to balance your ridge vent system.
• Always install ridge vents from end to end across the entire ridge for best appearance and to provide maximum ventilation area.
• Hip roofs, dormers and T- or L-shaped roofs may require a specially designed ventilation system. For information, request a copy of Air Vent's Principles of Attic Ventilation.See Contact Us.

Balancing Your Ridge Vent System

Length of Ridge	Linear Feet of Continuous Soffit Vent	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

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.