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If fitting the small end of the reducer to fan spigots or duct fittings, you will need a small piece of duct to enable a clean fit. Duct Cowling Grille is ideal for mounting on an external wall that is in an exposed position and where an outlet will be open to bad weather.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.