Some of the best brands of roof vents as of 2015 include Speeedi, Broan and Air King, according to BestConsumerReviews. Roof vents help to keep moisture under control and give shingles a longer lifespan.
The Speeedi Products EX-RCGC 06 6-Inch Diameter Galvanized Roof Cap is a good choice for both residential and commercial use. The damper on the unit provides a back-draft and comes with a removable screen. The unit is also effective for exhaust venting structures, and usually comes with a one year warranty. Homeowners are advised to ensure that the unit meets the building codes in their area before installation.
The Broan-Nutone 636 Roof Cap Steel/Black Finish is an affordable unit for use in residential and commercial buildings. The product is lightweight and works best for round ducts. The back-draft damper is built into the unit. The product is sturdy, comes with a bird screen and is aesthetically pleasing because of its sleek design. It is efficient and easy to install.
Finally, the Air King PRC6R 6-Inch Round Professional Hood Roof Cap comes in different sizes, ranging from six to ten inches. It features a professional design complete with a wall cap. The product is durable and sturdy because it is made out of galvanized steel, with a built-in back-draft damper. The device usually comes with a one year warranty.