Specifications
Static Roof Vents
HOW TO SPECIFY NON-POWERED ROOF VENTS
According to federal guidelines, homes require 1 square foot of net free area (the total unobstructed area through which air can enter or exhaust a non-powered vent) for every 150 square feet of attic floor space. If balanced between intake and exhaust vents, the requirement is 1 square foot of net free area for every 300 square feet of attic floor space.
NON-POWERED ROOF VENTS
| Type | Net Free Area (Sq. In.) |
Roof Pitch |
| Square Metal Roof Vent | 50/pc. | 3/12 to 8/12 |
| Square Plastic Roof Vent | 61/pc. | 3/12 to 8/12 |
| Round Galvanized Steel Roof Vent | 144/pc. | 3/12 to 8/12 |
| Round Plastic Roof Vent | 144/pc. | 3/12 to 8/12 |
| Slant-Back Metal Roof Vent | 50/pc. | 3/12 to 12/12 |
| Slant-Back Plastic Roof Vent | 61/pc. | 3/12 to 12/12 |
| Wind Turbines | 112/12" turbine 154/14" turbine |
3/12 to 12/12 3/12 to 12/12 |
MINIMUM NUMBER OF NON-POWERED VENTILATORS NEEDED
(If ventilation is split between soffit and ridge)
| Net Free Area Required (Square Inches) | |||||||
| 240 | 480 | 720 | 960 | 1200 | 1440 | ||
| Attic Square Footage | Type of Vent | ||||||
| 500 | 1000 | 1500 | 2000 | 2500 | 3000 | ||
| EXHAUST PRODUCTS | |||||||
| 3 | 5 | 8 | 10 | 12 | 15 | roof vent (50 sq. in. net free area per piece) |
|
| 2 | 4 | 6 | 8 | 10 | 12 | roof vent (61 sq. in. net free area per piece) |
|
| 1 | 3 | 4 | 5 | 6 | 7 | 12" wind turbine | |
| 1 | 2 | 3 | 4 | 4 | 5 | 14" wind turbine | |
| INTAKE PRODUCTS | |||||||
| 5 | 9 | 13 | 18 | 22 | 26 | 16" x 4" undereave | |
| 3 | 6 | 9 | 12 | 15 | 18 | 16" x 6" undereave | |
| 3 | 5 | 7 | 9 | 11 | 13 | 16" x 8" undereave | |
| 2 | 4 | 5 | 7 | 9 | 10 | 8' continuous soffit vent | |
| 2 | 3 | 4 | 6 | 7 | 8 | 10' vented drip edge | |
Static Vents: Roof Louvers | Wall Louvers | Wind Turbines
Professional Site | Site Map | Terms and Conditions | Privacy Policy© Air Vent, Inc. 1800-AIR-VENT
Professional Site | Site Map | Terms and Conditions | Privacy Policy