Living Daylight | Aluminium, Laylights, Roof Vents & Roof Windows for Glass or Polycarbonate Glazing
A Crash Course in Roof Venting, Understand when to vent your roof, when not to, and how to execute each approach successfully by Joseph Lstiburek
A Crash Course in Roof Venting - Fine Homebuilding Article
Ventamatic SBV 40 GVBRN Galvanized Screened 40 Square Inch Static Roof Vent with Slant Back, 6-Pack, Brown -- You can get more details by clicking on the image.
Trusty 17480AWB Plumbing Stack Roof Vent *** More info could be found at the image url.
ATWOOD 803350 Roof Vent, Polar White ** You can get more details by clicking on the image.
building an outhouse - frame and roof vent
Lippert Components 389381 White Roof Vent, (360 Siphon) *** Check this awesome product by going to the link at the image.
Learn the best practices for venting a kitchen and sealing the roof vent.