The FAMCO FB Round Vent Base – Flat Roof is used with a Globe Vent or any other round based roof vents without a flange. The Flat Base FB is used for flat roofs with no pitch or slope. This product features a large flange for easy installation and leak protection. No field trimming required. Weather proof construction. Crimped for secure fitting of ventilation units. Quality constructed in 28-24 gauge Galvanized steel. The FAMCO FB Round Vent Base – Flat Roof comes in a range of sizes: 4 inch, 6 inch, 8 inch, 10 inch, 12 inch, 14 inch, 16 inch, 18 inch, 20 inch, 22 inch, and 24 inch. The FAMCO FB Round Vent Base – Flat Roof is manufactured by FAMCO in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this product, please refer to the FAQs above or feel free to contact us by phone or email.
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OUR PRODUCT GUARANTEE FAMCO prides itself on Quality Built Products manufactured from quality raw materials. All products are guaranteed to be free of defective material or workmanship for a period of one year from the date of delivery. During the guarantee period, if any parts prove defective, they will be replaced free of charge. Please click 
Joseph dunning (verified owner) –
nice product
ALEKSANDRA BRICHE (verified owner) –