45 Intake Vent

Marco’s 45 Intake Vent is engineered to deliver efficient attic ventilation by allowing fresh air to enter at the roof line, promoting proper airflow and helping extend the life of the roofing system. Made from durable no-break polypropylene, this intake vent is designed to perform in tough conditions while staying lightweight and easy to install. With a low-profile design and compatibility with roof slopes from 3:12 to 16:12, it provides a clean finish without sacrificing performance.

Benefits

By introducing balanced intake airflow, the 45 Intake Vent supports a healthier roofing system by reducing heat buildup and moisture accumulation that can lead to structural damage and higher utility costs. Its durable composition withstands harsh weather and pressure conditions up to -75 psf, while screened and filtered options help block debris and pests. Fast installation and code approvals make it a reliable choice for contractors looking to minimize callbacks and deliver long-term performance.

VIEW SPECS

Specs:

Net Free Area: 45 sq. in.

Width: 11 ¾”

Length: 48”

Vent Weight: 1 1/8 lb

Material: No-Break Polypropylene

Color: Black

Limitations:

Roof Slope: 3:12 to 16:12

Design Pressure: -75 psf

Screened and filtered versions available

Codes & Standards:

U.S. Pat. No. 11,746,531

Texas Department of Insurance RV-131

Florida Building Code PENDING

Miami-Dade County NOA No. 24-0313.04

How To Install

All requirements specified in the International Residential Code (IRC) and the International Building Code (IBC) must be satisfied and manufacturer’s installation instructions followed, unless otherwise specified by this product evaluation.

ROOF DECK

The roof deck must be minimum nominal 7/16” thick OSB wood structural panels.

ATTACHMENT OF VENT TO ROOF

The vent is secured to a minimum 7/6” OSB roof deck and has a 1-1/2” by 46” hole cut out. The base of the vent (flashing) is fastened to the roof deck using minimum 11-gauge x 2-1/2” long galvanized smooth shank nails with a minimum 3/8” diameter head. Refer to manufacturer’s instructions for fastener locations. The fasteners are not required to penetrate the roof framing. Fasteners must be long enough to penetrate completely through the roof deck.

NOTE

Keep the manufacturer’s installation instructions available on the job site during the installation. Use corrosion resistant fasteners as specified in the IRC and the IBC.

ADDITIONAL RESOURCES

VENTILATION CALCULATOR

Calculate the exact amount of ventilation needed for a well-balanced system.

TECHNICAL TOOLS

Dive deep into product sheets, diagrams, and full spec breakdowns.

Roofing FAQ

Learn everything you need to know about ventilation.

45 Intake Vent

Benefits

VIEW SPECS