Sub Flashing

The Vent That Protects

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.

Simply install Sub Base over hole in sheeting, paper around it and install dormer vent over the top. The flushing can also be reversed if a flush surface is required!


SKUTop size in inchesFlange Size in inchesNFVA IN SQUARE INCHES
VSB121213.5×13.520 x 20105
VSB858510×1016.5 x 16.554
*Is watertight, inquire for more info.
“NFVA”: Net free ventilation area. This indicates the amount of open ventilation, measured in square inches.

Our sub-flashing is compatible with almost ALL popular roof dormer vents. Installation is usually dead simple.