Replacing roof vent
I'm inexperienced to this stuff so please forgive me if this is a dumb question:
I'm wanting to replace a dead powered attic fan with a new passive vent and I'm pretty sure I've decided on the Ventilation Maximum 301-12 (see link below). The 301-12 requires a 12"x12" square hole in the roof and its flashing has a 19.5" diameter, but the existing hole from the attic fan is an oval shape with a 16.5" diameter at the widest measurement giving me about 3" of overlap. Is that enough or is there a flashing extension that I can add on or something else? Thanks.
https://www.ventilation-maximum.com/en/sloped-roof-ventilators/
I'm inexperienced to this stuff so please forgive me if this is a dumb question:
I'm wanting to replace a dead powered attic fan with a new passive vent and I'm pretty sure I've decided on the Ventilation Maximum 301-12 (see link below). The 301-12 requires a 12"x12" square hole in the roof and its flashing has a 19.5" diameter, but the existing hole from the attic fan is an oval shape with a 16.5" diameter at the widest measurement giving me about 3" of overlap. Is that enough or is there a flashing extension that I can add on or something else? Thanks.
https://www.ventilation-maximum.com/en/sloped-roof-ventilators/