From DCI Products (maker of SmartVent roofing ventilation solutions)

Roof ventilation, or lack thereof, is the leading cause of premature roof failures.
These failures include problems with dry rot, mold, mildew, condensation, warped decking, curling shingles, cracking shingles and structural failures. The proper and complete attic ventilation solutions are the answer when building new homes, remodeling existing homes and making improvements to commercial buildings.

Intake Ventilation
The patented SmartVent creates roof top, continuous intake airflow when soffit vents are inadequate or non-existent. The SmartVent can be used at the eaves edge, slightly up the roof and many other locations such as an exhaust vent on a shed roof or off-peak for firewall protection. The SmartVent can be used virtually anywhere on the roof and may be the only vent product the roofer ever needs. SmartVent has been field tested and approved since 1999 and creates an energy efficient roof system when proper exhaust vents are installed. At 9 NFA SmartVent provides a total of 18 NFA when installed at both eaves. This matches or exceeds all ridge vents.

Exhaust Ventilation
Topping the roof is DCI’s patented SmartRidge I and SmartRidge II. The 100% energy efficient design of SmartRidge I literally sucks attic air out like a straw and is the lowest profile ridge vent with a no street-side lift on one side. Due to this one side having no lift, 100% of the hot moist attic air is siphoned out instead of the short circuit that can occur on most double-sided ridge vents. SmartRidge II provides superior weather protection for ridge and hip ventilation.