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Inline Duct Fan Joist V-Cradle
Screw this 90° V-cradle to the side of a joist to hold an inline booster fan in a long bathroom exhaust duct run. Use a pair of them, one near each end of the fan. The V centres any round fan body from 100 to 150 mm OD, so it works with most 4 in inline fans without knowing the exact housing size. Each cradle is 154 x 139 x 30 mm and has two 5.5 mm holes for #10 wood screws (4.8 mm shank) or M5 bolts. Two 21 x 4 mm slots take a hook-and-loop or webbing strap up to 20 mm wide, which goes over the fan and holds it down so you don't have to zip-tie it to the duct.
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