Name: Air Intake Roof Louver | 18″ Diameter 12″ Tall Collar PV-18-C12
Brand: Active Ventilation Products
SKU: PV-18-C12
Price: 187.00 USD
Availability: InStock

Drawings – Installation Instructions – UL Certificates – Florida Approvals – Texas Dept of Insurance –
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Dimensions

Basic dimensions of the Pop Vent and it’s identifying attributes. Primary identifying dimensions of vents and fans are the inside diameter of the Head, which equals the diameter of the hole being vented, and the height of the Collar which is the solid tube between the Head of the vent and the Flange which attaches to the roof.

Inside Diameter:

18 in.

45.7 cm.

Outside Diameter:

26 in.

66 cm.

Square Flange (side length):

28 in.

71.1 cm.

Height of Head:

8 in.

20.3 cm.

Collar Height:

12 in.

30.5 cm.

Height of Flange:

0 in.

0 cm.

Total Height with Collar and Flange:

20 in.

50.8 cm.

Louvers

Louvers are the vertical openings in the vent, which facilitates the flow of air, while keeping animals, insects, debris, and embers out.

Louver Height (inside):

2.5 in.

6.4 cm.

Number of Louver Rows (inside):

Louver Height (outside):

1.125 in.

2.9 cm.

Size of opening btwn blades (inside):

0.125 in.

0.3175 cm.

Size of opening btwn blades (outside):

0.125 in.

0.3175 cm.

Roof Pitch

Expected snow and rain in your region and the pitch of the roof are the key consideration when choosing the height of the collar of your roof vents. Zones 1 and 2 are not expected to sustain significant snow packs, while zones 3-7 are likely to experience snow, possibly for weeks or months. Vent collars under 4 inches are inappropriate for flat (0/12 pitch) roofs because even heavy rain can splash water into a shorter vent.