# Active Ventilation SM-rib Aluminum Static Roof Vent 4 in. Dia. NFA 12 sq. in. 2 in. Collar Aluminum Mill Finish

**Brand:** [Active Ventilation](https://shop.coreranger.com/brands/Active%20Ventilation)
**SKU:** RBV-4-C2-SM-rib
**Price:** $40 · in stock
**URL:** https://shop.coreranger.com/product/active-ventilation-sm-rib-aluminum-static-roof-vent-4-in-dia-nfa-12-sq-in-2-in-collar-aluminum-mill-343443519

## Specifications

| Spec | Value |
|---|---|
| Model # | RBV-4-C2-SM-rib |
| Features | No Additional Features |
| Material | Aluminum |
| Pack Size | 1 |
| Internet # | 343443519 |
| Power Type | Non-Powered |
| Returnable | 90-Day |
| Store SKU # | 1016009439 |
| Color Family | Silver |
| Color/Finish | Mill Finish |
| Intake/Exhaust | Exhaust |
| Mounting Position | Roof Mount |
| Product Depth (in.) | 12 in |
| Product Width (in.) | 11 in |
| Product Height (in.) | 4 in |
| Manufacturer Warranty | 1 year |
| Net-Free Area (Sq. In.) | 12 |

## Description

The RBV-4-C2-SM-Rib is a premium 4 in. round-back static roof vent engineered specifically for metal roofs. This is done by featuring a 11 in. x 12 in. sub-base that is fabricated to the profile of the SM-Rib, Tuff Rib, Panel-Loc Plus, AG-Rib, and Master Rib exposed fastener metal roof designs. Having the roof vents base match the shape of the SM-Rib roof ensures a watertight, professional fit. Optimal Airflow: A 2 in. tall collar provides critical clearance between the roofline and the internal louvers, maximizing exhaust efficiency. Capacity: With 12 square inches of Net Free Area (NFA), a single vent effectively exhausts up to 50 sq. ft. of attic space (based on the IBC 1/300 rule). Strategic Placement: Designed for roof pitches of 2/12 or greater. For maximum performance, you may install the roof vent down to 4 feet maximum from the ridge cap to capture and release the hottest air and moisture. Weather-Ready Design: Spun from a single piece of heavy-duty, corrosion-resistant aluminum, the aerodynamic lid provides superior structural strength against high winds and harsh weather. Pest & Debris Shield: Precision-engineered internal louvers prevent rain and snow intrusion while keeping birds, insects, and wildlife out of your attic. Lifetime Build: All-aluminum construction ensures the unit will remain rust-free for the life of the roof.

• Internal louvers prevent rain and snow intrusion
• Made of corrosion-resistant aluminum for durability
• Designed to fit roof pitches 2/12 or greater