Mars Hydro 4 Inch Inline Fan And Carbon Filter Combo With Thermostat Controller



  • Fan/Duct/Filter Size: 4 Inch
  • Airflow: 205CFM
  • Noise: 26.8dBA
  • Controller Type: Digital Thermostat Controller

Featuring a 4 inch inline duct fan rated for 205CFM and a carbon filter with Virgin Australian activated charcoal, controlled by a digital touch-screen thermostat controller, the Mars Hydro 4” inline duct fan and charcoal filter combo ventilation system provides you with everything you need to manage the temperature, the air circulation and the odors in your grow space.




The Ventilation System Includes: 4” Inline Duct Fan| 4” Carbon Filter| Thermostat Controller| 33-ft Flexible Duct Tube| 3 Duct Clamps| 2 Haning Straps

Smart Operation and Quiet Inline Fan: With a PWM-controlled EC-powered motor and mixed-flow design, the Mars Hydro 4 inch inline fan delivers airflow up to 205 CFM quietly. Controlled by a digital touch-screen thermostat controller with a sensor probe, this 4 inch inline fan features “Environment Monitor”, “Timing Schedule”, “temperature/humidity alarm”, and “high/low temperature or humidity triggers” functions. It also provides other essential features — 10-speed adjustment to meet your ventilating requirements, controller lockout to prevent accidental triggering, calibration mode to modify the detected ambient data, screen brightness modification to protect your eyes in whether bright or dark rooms…Every feature is designed to make your indoor growing easy and happy, and to maintain a stable and consistent indoor grow environment.

Keep The Air Fresh With Charcoal Filter: The filter core is made of 1050+ activated charcoal imported from Australia to bring 100%-fresh air and eliminate odors, harsh tastes, and particles. The double-sided galvanized steel mesh provides 53% of the open area for airflow to pass through so that the odor absorption and elimination process can be carried out thoroughly. (The carbon filter was covered by a prefilter cloth; do not remove it when using.)

Durable Flexible Ducting & Connecting Accessories: This ventilation kit is paired with a 33-ft-long PVC thermoplastic flexible duct tube to direct the air in and out properly, durable and easy to use. With 2 adjustable hanging straps and 3 duct clamps to easily connect the inline fan, carbon filter, and ducting tube, the whole ventilation kit gets all the necessary parts to ventilate and filtrate indoor grow tents and grow rooms.

Your Smart Ventilation System:The Mars Hydro 4 inch inline duct fan and carbon filter combo ventilation kit is capable of ventilating and filtrating a 2×2 grow tent, a 2.3×2.3 grow tent, or a 3×3 grow tent. With a smart thermostat controller, this 4 inch ventilation kit will be the best grow tent air filtration and environment control system for your grow tent or grow room.


Airflow 205CFM
Noise 26.8dB-A
Voltage AC ~ 110-240V
Dimension 303mm*202mm*190mm

Mars SP 6500 - 650W LED Grow Light

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Knowledge Base

Can you attach a carbon filter directly to a fan?

One other option is to directly connect your carbon filter to your inline fan if you’re not using a grow light hood. The idea is any amount of air leaving your grow build must pass through your carbon filter so that odor does not spread.

Do inline fans push or pull air better?

Inline fans are generally more effective at pushing air through ducting, as opposed to pulling air. Therefore, especially for long sections of ducting, position the fan at the inlet end, not the outlet

How safe are carbon filters?

Are Activated Carbon Filters Safe? Yes. Activated carbon filters and air purifiers that use a PM 2.5 activated carbon filter are safe for use in commercial and residential spaces. Moreover, activated carbon filters are effective at removing volatile organic compounds commonly found in most households.

Is it better to push or pull air through a carbon filter?

Bottom Line: Controlled tests found no benefit of putting the air filter on the back (pulling) compared to the front (pushing).

How much does a carbon filter reduce airflow?

It is wise to factor in a 10% -25% drop in airflow due to the resistance of pulling through the carbon filter. Just remember, if you are running an exhaust system, DO NOT choose a fan that will exceed the exhaust rating of your filter.

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