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The Air-Pro by VMI model 5078 is a roof cap that terminates the exhaust duct from a range hood ventilation system at the roofline, sealing the duct outlet against weather and backdraft.
A ducted range hood system moves air from the cooktop through ductwork and out of the building, and the roof cap is the endpoint that makes that possible on a rooftop exit. Without it, the duct opening is exposed to rain and wind, and the system cannot maintain the pressure separation that keeps outdoor air from cycling back in. The 5078 seats over the duct and provides the covered termination that completes a code-appropriate ducted installation.
Because the cap accommodates both 10-inch and 8-inch duct, it works across two of the more common residential duct diameters without requiring a separate reducer fitting at the roof. That flexibility simplifies the installation on projects where the duct sizing is finalized in the field.
Roof caps live in a more demanding environment than wall caps or soffit vents. They face standing water, temperature cycling, and sustained wind exposure. The 5078 is the manufacturer-matched termination for Air-Pro ventilation components, so the fit at the duct collar and the structural spec reflect the demands of that position. Using a matched cap rather than a generic roof vent also keeps the installation within the Air-Pro product system, which matters when reviewing the ventilator's warranty documentation.
This cap suits new construction and remodel kitchens where the range hood exhaust runs vertically through the ceiling and roof deck. It is the right choice when the hood installation uses an Air-Pro power pack or ventilator insert and the duct exits at the roof rather than through a side wall or soffit. Installers running 10-inch or 8-inch round duct will find the dual-size fit especially useful when the duct diameter is determined by the ventilator's outlet rather than a fixed spec.
It is designed to fit both 10-inch and 8-inch duct sizes, giving it flexibility across two common residential diameters. One cap handles either size, which can simplify the supply list on a project.
This is a roof cap, intended for installations where the exhaust duct exits through the roof deck. If your duct terminates through an exterior side wall, a wall cap is the appropriate termination instead.
No. This is the roof cap termination accessory only. The Air-Pro power pack or ventilator insert that moves the air is a separate product.
The 5078 is the manufacturer-matched cap for Air-Pro systems. Compatibility with other ventilator brands depends on the duct diameter and collar fit; confirm the duct size and connection method before ordering for a non-Air-Pro application.
When the exhaust run goes up and out through the roof, the 5078 puts a weathertight, properly fitted cap on the system, matched to the Air-Pro ventilation components and ready for 10-inch or 8-inch duct.