Active Ventilation 4 in. Dia Aluminium Round Back Roof Jack with 4 in. Collar and 2 in. Tail Pipe

Active Ventilation Products Round Back Roof Jack is excellent for venting a duct. The design is great for terminating air from bathrooms and range hoods. Made of rust free aluminum with a 4 in. Dia adapter (tail pipe), with inner vertical louvers which prevent insects, wildlife, rain and snow from entering the jack. Meets code for forest fire prone areas.

• Great for exhausting bathroom fans, range hoods in the kitchen and more, fits existing ductwork
• Mill finish aluminum will continually have a long lasting clean appearance
• Built-in inner vertical louver cylinder has a 1/8 in. opening between louver blades that will keep out insects, birds, and animals while allowing air to move through the vent without resistance
• Round design provides for excellent air flow and maximum wind strength
• 2 in. clearance between bottom of vent cap and flange
• 1/8th in. opening between the louver blades and all aluminum (non-combustible) material meets the requirements of California building code 706A.2 vents to resist the intrusion of burning embers and flame through ventilation openings
• Helps to reduce energy costs by removing heat in the summer and excess moisture in the winter