Ostberg MK4 4" Rigid Galvanized Steel Duct Mounting Clamp with Rubber Lining from the MK Series

- Item #: BCI1390731

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Ostberg MK4 Reviews

Rated 1 out of 5 by from Improper size These are too small to fit around a standard 4" ventilation duct. It's about 3/4 inch to 1 inch in circumference too small. I've used equivalent Fantech clamps and have never had a problem with those. The Ostberg ones are just plain too small.
Date published: 2012-04-03

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