PRODUCT: Aura 18" I.d. Vent Base. 24x24" Square Base Flange With 6" High Round Collar. Fits All 18" Id Vents. All aluminum, mill finish. price/each. (shipping lead time 7-10 business days)
OPTIONS: Available in 4" to 48" diameter openings, Collar options are from 1", 2", 4" & 6".
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