
Continuous · Dormer · Eave · Foundation · Gable · Retrofit · Soffit
Our retrofit kits and matrixes are available simply for existing installations where removal of current hardware is unrealistic. The Honeycomb Matrix along with the screen mesh (sold together) can be used in a variety of retro-fit applications.Inside the attic, behind existing gable and eave vents, the matrix can be cut to size and fastened to the existing 1/4” screen. Retrofits are as easy as 1, 2, 3. Please feel free to contact us if you have any questions!
Learn more about the Vulcan Vent

Retrofit Gable End Vent: Exterior
SKU | SIZE IN INCHES | NFVA IN SQUARE INCHES |
---|---|---|
VG148R (S,FF,FB,FC) | 14 x 8 | 29 (approx) |
VG1412R (S,FF,FB,FC) | 14 x 12 | 54 |
VG1418R (S,FF,FB,FC) | 14 x 18 | 78 |
VG1424R (S,FF,FB,FC) | 14 x 24 | 102 |
Retrofit Gable End Vent: Interior
SKU | SIZE IN INCHES | TYPE | NFVA |
---|---|---|---|
VM1424 | 13.75 x 24 | Matrix Only Retrofit Gable End Vent: Interior | Depends too much on specific location and size of gable to determine |
VM2424 | 24 x 24 | Matrix Only Retrofit Gable End Vent: Interior | Depends too much on specific location and size of gable to determine |
VM4824 | 48 X 24 | Matrix Only Retrofit Gable End Vent: Interior | Depends too much on specific location and size of gable to determine |
Retrofit Half Round and Low Profile Dormers, Interior
SKU | SIZE IN INCHES | TYPE | NFVA IN SQUARE INCHES |
---|---|---|---|
VM1424 | 13.75 x 24 | Matrix only: Dormer, Round Retrofit | Depends* |
VDR918T | 9 x 19 | Trim only: Dormer, Round Retrofit | No restriction |
VDR918K | 9 x 19 | Full Kit: Dormer, Round Retrofit | No restriction |
VM2424 | 24 x 24 | Dormer, Round Retrofit | Depends* |
VDLR419T | 4 x 19 | Trim only: Dormer, LP Retrofit | Depends* |
VDLR419K | 4 x 19 | Kit: Dormer, LP Retrofit | Depends* |
VDR1224 | 12 x 24 | Matrix only: Dormer, Round Retrofit | Depends* |
VM4824 | 48 X 24 | Matrix only: Dormer, Round Retrofit | Depends* |
We can create custom sizes fit for your needs. * Contact us for info
Retrofit Half Round and Low Profile Dormers, Exterior
SKU | SIZE IN INCHES | TYPE | NFVA IN SQUARE INCHES |
---|---|---|---|
VDR1224K | 12 x 24 | Dormer, Round Retrofit | 90 |
VDR918K | 9 x 18 | Dormer, Round Retrofit | 51 |
VDLR914K | 4 x 19 | Dormer, LP Retrofit | 56 |
Continuous, Soffit Retrofits
SKU | SIZE IN INCHES | TYPE | NFVA IN SQUARE INCHES |
---|---|---|---|
VFS814RF | 8 x 14 | Soffit/Foundation Retrofit | 62 |
VSC2120RF | 2 x 120 | Continuous Soffit Retrofit | 96 |
VSC3120RF | 2 x 120 | Continuous Soffit Retrofit | 144 |
Reference Table: Retrofit Eaves
SKU | SIZE IN INCHES | NFVA IN SQUARE INCHES |
---|---|---|
VE3522R | 3.5 X 22 | 41 |
VE5522R | 5.5 X 22 | 75 |
VE5514R | 5.5 X 14 | 44 |
VE7514R | 7.5 X 14 | 75 |
VE7522R | 7.5 X 22 | 119 |
PDF INSTALLATION INSTRUCTIONS FOR CONTINUOUS RETROFIT SOFFITS

The Vulcan Sub Flash is a remarkable product that can be used in conjunction with any other manufacturers dormer or roof vent and turn it into an ember and fire safe vent:
Subflashing
SKU | Top size in inches | Flange Size in inches | NFVA IN SQUARE INCHES |
---|---|---|---|
VSF7519* | 8×19 | 15×26.75 | 108 |
VSB1212 | 13.5×13.5 | 20 x 20 | 105 |
VSB8585 | 10×10 | 16.5 x 16.5 | 54 |
More retrofit documents available in the downloads page.