Mars Hdyro 4 Inch Inline Fan and Filter Kit, Duct Fan with with Temperature and Humidity Controller, 205 CFM Quiet & Efficient Exhaust Fan for Grow Tents Hydroponics

great product; works well

I've only been testing this fan/filter for a few weeks, but so far I'm very happy. It moves a ton of air in my 4x4 and the fan (which I installed inside the tent) is decently quiet when cranked up to max settings. It was very easy to assemble and install, and I have no experience with these kinds of things. I did opt to seal the ducting with aluminum foil tape in addition to the hose clamps -- the tape needs to be bought separately. That said, I don't know if that's even necessary. The smart monitor is REALLY nifty. Tons of settings to automatically adjust for different scenarios when certain conditions are met. When I thought I had a problem with the monitor (it was actually just me being dumb though) customer support responded to my question in a few hours. Really can't complain! I'll try to update a year or so down the road and let you know how well it ages. In the meantime though, I'm a happy camper..

This is quite possibly the best in line fan ever. Not only does it completely sustain a 3x3 tent, it literally sucks the humidity out of the whole room as well. The fact that it has a temperature and humidity sensor just sends it over the top. The mountable controller makes changing settings a breeze. The automation is a must have, I do not know how was running a fan full blast 24/7 before. Probably because there was no solution like this out there. Mars Hydro has really outdone themselves this time. Top of the line fan with a great controller. I will be ordering more for my other grow area. I can honestly say that Mars Hydro products are some of the best in the game right now. They have come a long way and continue to impress me.

A few years ago fans like this were way too powerful for smaller tents. Even those with three settings, the lowest one was likely too powerful and would create a hurricane in a smaller tent. The variable speed control with ten levels, including slower speeds, is a real game-changer. This fan is exceptionally quiet at low settings. It's like a bathroom vent fan at 4 or below. Starts to get a little noisy if you turn it up higher. It's a perfect solution for a 2x2 tent as you can set it at a speed that will vent the tent but won't create negative pressure and suck the sides inward.. If you have a 3x3, especially a taller one like a Gorilla, you probably want to opt for the six-inch if noise is your #1 concern - a larger fan spinning more slowly will produce less noise than a smaller fan spinning at a higher RPM.

UPDATED Seller has great customer service. I contacted regarding details as to the fan I received and Mars worked quickly to resolve my issue and were very polite. The fan received is great quality. Very similar to fans priced 50$ more, The Mars fan has a great green color and all the same features. I will buy again and would advise anyone wondering about this fan to purchase. Controller works and the fan moves air. Pleased with my purchase. Thanks Mars

I love this fan it is very quiet even when it is operating on a high setting

The fan is okay, maybe a little louder than I expected but still ok. I’m giving it a 1-star because the billing was completely botched, not sure if this was Mars Hydro or Amazon, but this forced me to get a new credit card and wasted an enormous amount of time dealing with fraud claim which ended up being a false claim and having to re-do most of my auto-payments. It was initially billed the correct amount, $139.36, a couple days later I saw a pending charge for $59.73 without any vendor information which I reported as fraudulent, almost a week later I saw yet another charge for $79.63 and the next day the original $139.36 posted charge was reversed, but by then I had already received a charge credit and a new credit card. Why was the $139.36 amount for the fan split into 2 charges ($59.73 + $79.63) in multiple day transactions is beyond me, I was going to buy more accessories from Mars Hydro, but no more.

I set this up in my bathroom because My wife be eating Taco Bell and her poo smells horrible. This fan gets the smell of rancid poo out the bathroom. Thanks Mars Hydro!!

Au top et silencieux

Ich hatte mit dem Kohlefilter Probleme, da er die Luft nicht ausreichend gefiltert hat. Nach dem Kontakt mit Alice vom Kundenservice & meiner Schilderung des Problems wurde mir ein neuer Kohlefilter zugesendet. Dieser Arbeitet zuverlässig & ich kann das Produkt mit gutem gewissen weiterempfehlen.

Can’t fault it. Easy to use and setup. I’ve had mine on 24/7 for 4 month now. Still no issues

O kit de ventilador e filtro Mars Hydro é incrível! O ventilador é potente e silencioso, garantindo ótima circulação de ar, enquanto o filtro de carvão funciona perfeitamente, eliminando qualquer odor indesejado. É evidente que o produto foi desenvolvido com materiais de alta qualidade e pensado para durar. A instalação foi simples e o desempenho superou minhas expectativas. Recomendo este kit para quem busca eficiência e confiabilidade em sistemas de ventilação!

Assez vite bruyant mais fait bien le taf