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We've been supplying these for years now, and basically what it does is use wind outside to spin the turbine and pull hot air out of the building—no electricity needed at all, which is pretty much the whole point, and the RT-300 and RT-400 models come in either 304 stainless steel or alumnum alloy depending on your budget and enviornment.
The UBC sealed bearings from the USA are what make these last, and we're talking a service life of 15 years or so in most cases, though if you're in a coastal area with heavy salt spray you might want to stick with the full stainless version since the aluminum can pit over time—that's just a fact, not a sales pitch.
Installation is roughly 30 minutes once you're on the roof, and the variable angle neck tube handles slopes from 0 to 22.5 degrees without any extra adapters, which is better than most fixed-angle units we've seen, and the arc blades are designed to keep rain out even during a downpour (they're not perfect in a hurricane, but for standdard weather they're fine).
Most buyers are workshop owners or warehouse managers who've got heat buildup issues, and they typically order one per 1000 square feet or so of floor space, but if you've got high ceilings or heavy machinery you'll want to double-check the CFM rating against your specific space—we usually have stock on the silver color, but custom colors add 2-4 weeks to lead time.
The MOQ is 10 units for the aluminum version and 5 for the stainless, and our company can provide a COA with HPLC data on the bearing grease if that's a concern for your application, though honestly most people just want to know it'll spin freely and not seize up after a season or two.
Anyway, the centrifugal force and negative pressure principle means it works even in light breezes, but don't expect it to move air like a powered fan on a still day—it's designed for natural ventilation, not forced exhaust, so if you need constant high-volume airflow you're better off looking at electric units.
The RT-300 and RT-400 differ mainly in size and airflow capacity—the RT-400 is larger and moves more air. Both use the same 304 stainless steel blades and UBC sealed bearings. Your choice depends on the roof space and ventilation volume you need.
No, the UBC sealed bearings are pre-lubricated and sealed for life, so you don't need to oil them. That's one reason the fan can run for 15+ years with minimal upkeep.
It's designed for flat to moderately sloped roofs up to 22.5 degrees. If your roof pitch is steeper, the fan may not sit level or spin properly, so we don't recommend installing it on slopes beyond that.
Each unit is ISO 9001 and CE certified, so you get documentation confirming it meets those standards. We can provide copies of the certificates upon request to support your compliance needs.
Yes, we can customize the color for bulk orders—just let us know your required shade. The standard material is 304 stainless steel or aluminum alloy, but if you need a different spec, we can discuss options based on your MOQ.
