ISO Acoustic Box Fan 12" 315mmISO ACOUSTIC BOX FANS This ISO acoustic inline box fan is a powerful, yet quiet extraction fan for indoor hydroponic grow rooms. The centrifugal extraction fan is mounted inside a lined acoustic galvanised steel box to help dampen not only the sound of the fan, but also unwanted wind noise making them ideal for grow rooms where noise could be an issue. Supplied with a 2. 5 metre cable with UK plug, the galvanized box also comes with duct spigots to
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