Systemair RVK Sileo 150-A1 6" (150mm)-(420m3/hr) 

Systemair RVK Sileo 150-A1 6-Inch (150mm) In-line Duct Fan (420m3/hr)
The Systemair RVK range of In-line Duct Fans are ideal for removing old air or supplying fresh air to your grow-space. Systemair fans are of excellent quality and are amazingly reliable

Systemair – Top In-line duct fan manufacturer
Removes stale air from your grow-space
Can be used to supply fresh air to your grow-space
Can be used with 6-inch (150mm) ducting, carbon filters, airsocks etc.
6-inch (150mm) fan – ideal for medium size grow-spaces
Powerful – large air-flow for it’s size – 428 m3/hour
Quiet – only 40.6 dB
Maintenance-free and highly reliable