4 fold louvers
The name 4 fold louver comes from the bottom front of the louver being folded into four layers of aluminum.
The top of the louver has a double hem to add even more strength.
The louver ends are then wrapped around an aluminum rail system (not wood framing) to complete the vent's strength.
The rail system looks something like this.
Most other vent manufacturers use a track instead.
Smooth trim is our preference, not pie crust.
Just a few samples of spec drawings to better explain these vents and how they are more durable and stronger.
The "No Flange" trim will have no nail fin.
This is the one vent style to be called a "retro fit vent" due to it's versatility.
This is the one vent style to be called a "retro fit vent" due to it's versatility.
The back flange will mount before the exterior wall cladding.
Or...it can be used to mount the vent from inside the attic.
The depth needs verified before attempting this.
And most vent shapes will still need an exterior seal.
Or...it can be used to mount the vent from inside the attic.
The depth needs verified before attempting this.
And most vent shapes will still need an exterior seal.
Front flange vents are the most common due to the ease of the install.
The flange being afaced, it doubles as a finish trim as well.
Cover it with a trim board or leave it exposed.
Completely optional.
Cover it with a trim board or leave it exposed.
Completely optional.
Each depth of vent has a different louver spacing.
The deeper the vent, the more the louver rises in the rear.
The more rise, the more water protection.
But also allows for more distance between the slats for better ventilation.
The deeper the vent, the more the louver rises in the rear.
The more rise, the more water protection.
But also allows for more distance between the slats for better ventilation.
The 1 inch deep vent will have a louver spacing of 1 inch.
Whereas the 2 inch will be spaced 1 1/2 inch.
And the 3 1/2 inch deep vent, a 2 inch spacing.
That leaves the 5 1/2 inch deep vent at 2 1/2 inch spacing.
The wider gappage allows for less blockage and more air flow on medium and large vents.
Short vents bennefit more from the 1 inch depth.
Whereas the 2 inch will be spaced 1 1/2 inch.
And the 3 1/2 inch deep vent, a 2 inch spacing.
That leaves the 5 1/2 inch deep vent at 2 1/2 inch spacing.
The wider gappage allows for less blockage and more air flow on medium and large vents.
Short vents bennefit more from the 1 inch depth.
All louver vents are designed to work using the same structural rail system.
No matter the flange chosen.
Comparing these vent schematics side by side is a great example of our manufacturing process.
As well as the repetition of the process.
As well as the repetition of the process.
As the most common vent for builders, the commonly known 4 inch vent is 3 1/2 inches deep.
This became common when studs were plained down to 1 1/2 x 3 1/2 inches from the full sawmill lumber measure of 2 x 4 inches.
This was so builders could install the vent at their chosen point of the build without it protruding past the studs into the attic area.
This became common when studs were plained down to 1 1/2 x 3 1/2 inches from the full sawmill lumber measure of 2 x 4 inches.
This was so builders could install the vent at their chosen point of the build without it protruding past the studs into the attic area.
