Global Air Supplies Fans

About

Global Air Supplies – G.A.S. – build extraction fans specifically for grow rooms rather than adapting general ventilation kit. The range covers standard AC inline fans, silenced boxes and EC fans with proper speed control. The range AC inline fans – the straightforward option. Single or twin speed, reliable, cheapest per m³/h. Silenced and box fans – the motor and impeller sit inside an insulated housing. Substantially quieter, which is what matters in a flat or a bedroom. EC fans – brushless motors with fully variable speed, far more efficient at part load and much quieter when turned down. More expensive up front, cheaper to run. Controllers to drive them on temperature or humidity rather than a fixed speed. AC or EC? AC EC Speed control Stepped, or a separate controller Fully variable, built in Efficiency at part load Poor Excellent Noise turned down Can hum or buzz Genuinely quiet Cost Lower Higher up front If the room runs constantly and noise matters, EC pays back. For a single tent run at full speed, AC is fine. Sizing Work out the room volume in cubic metres and aim to change the air roughly once a minute, then add capacity for the resistance your carbon filter and ducting add – typically 25-50% on top. Fan and filter diameter must match. Related See all extraction fans , EC fans , fan speed controllers and silencers . Why buy G.A.S. from The Hydro Bros? We are a hydroponics shop in Croydon and we size extraction for customers every day. Tell us the room dimensions and the lighting load. Discreet UK and European delivery, and excellent customer reviews on Trustpilot .