Mammoth TT Twin Speed Inline Fans

Mammoth TT Twin Speed Inline Fans - Two-Speed Extraction From 4" to 12"

Best for: Growers who want straightforward, reliable AC extraction with the flexibility of two speed settings, across tent sizes from a small 4-inch cupboard grow to a 12-inch commercial room.

The Mammoth TT Twin Speed Inline Fan is a standard AC inline fan built for grow tent and grow room extraction, with two selectable speed settings so you can run it flat out during lights-on and drop it back when full extraction isn't needed. It's IP65 rated for moisture resistance and includes thermal overheat protection, backed by a 2-year manufacturer's warranty. The 6-inch model, for example, runs at 3200 RPM on 150W at 220-240V.

The range spans six sizes, from a 4-inch fan moving 165-198 m3/h up to a 12-inch fan moving well over 1750 m3/h, with noise levels rising from around 26dB on the smallest model to around 61dB on the largest at full speed. That range covers most tent setups without needing to size up to an EC fan.

How it compares

The TT is a conventional AC fan, positioned below EC alternatives like the Mammoth S-Max on price and running cost, but ahead of it on upfront simplicity.

• Compared with EC fans such as the Mammoth S-Max or Vortex Storm EC, the TT costs less upfront but runs less efficiently at partial speed and doesn't offer stepless speed control.
• Against other standard AC fans like RVK/Systemair or Vortex Powerfan, the TT's twin-speed switch gives more flexibility than a fixed-speed fan for a similar price point.
• The IP65 rating and thermal protection put it on par with other reputable grow-room fan brands, rather than unbranded budget alternatives that often lack overheat protection.

If you don't need stepless speed control or the lowest possible noise floor, the TT gets you reliable, protected extraction for noticeably less than an EC fan.

Usage guidance

Getting the size and speed setting right keeps your grow space at the right temperature and humidity without unnecessary noise.

Sizing to your space
Pick a fan size that can turn over your tent's air volume several times an hour - as a starting point, match the fan diameter to your carbon filter and ducting, then check the m3/h rating against your tent volume.

Choosing a speed setting
Run on the higher speed during lights-on, when heat and humidity load are at their peak, and switch to the lower speed at night or during propagation when less extraction is needed.

Installation
Mount the fan close to the top of the tent, drawing air out through a carbon filter and ducting to an outside point. Support the fan's weight from the tent frame or a ceiling batten rather than relying on the ducting alone.

Technical specifications

• Motor type: standard AC, twin-speed selectable
• Water resistance: IP65 rated
• Protection: thermal overheat protection
• Warranty: 2 years
• Sizes available: 4", 5", 6", 8", 10", 12"
• Airflow range: 165 m3/h (4") up to 2200+ m3/h (12")
• Noise range: approximately 26dB (4") to 61dB (12") at full speed
• 6" model: 3200 RPM, 150W, 220-240V
• Price range: £34.99 to £179.99 across the size range

Who this is for

• New growers setting up their first tent who want reliable extraction without EC-fan pricing
• Anyone who wants basic speed flexibility between lights-on and lights-off periods
• Growers scaling from a small tent to a larger room who need a matching fan size
• Budget-conscious buyers who don't need the lowest possible noise floor

Best suited to standard tent and small-room grows where a dependable twin-speed AC fan covers what's needed.

Our take

This is a fan that gets on with the job without fuss - twin-speed control, proper overheat protection, and sizing to suit almost any tent. It won't out-quiet an EC fan, but it doesn't need to at this price.

Match the size to your filter and ducting, and it'll run reliably for years. Does exactly what it should, day in, day out.