Is this unit ul tested, if yes, to what standard. if not, what standards has it been tested?

UL 507 is the relevant standard for electric fans, however this fan was not tested by UL. Also important to note that UL Listed products are tested while UL Recognized products are not tested. Both levels require a direct marking on the part which means this fan has neither level. To be honest most fans at this price level are not going to be agency tested just because the target market is PC case fans, and the things UL tests for are not relevant to PC builders. The fan has CE certification which is just saying it won't burn your house down. CE doesn't check fans for performance; you're better off reading reviews than looking for agency approvals if this is a PC fan.

will this fan work with just pos & neg hooked up? do I need all for wires hooked up to work ? thanks

Will work with just pos and neg.

If I plan to use more than 50% capacity of the 5300rpm model, would I need to connect it to a controller/hub rated for more than 1amp per lane?

I would make sure that which ever Fan Port you connect this High Airflow Fan that it will support the amperage stated in the specs of the fan.

Any water or dust resistance rating? ip52, ip67?

I do not see any water/dust proof rating printed, however, I use this fan as a range-top exhaust fan in suction mode, so all cooking steam & grease-laden fumes are drawn across/through the fan... daily. Thus far, it has performed flawlessly, despite the harsh environment. I recommend this fan.

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Dimensions: 120x120x38 mm ( 4.72x4.72x1.5 in ) | Rated Voltage :12V | Rated Current: 2.0 A | Airflow: 213 CFM | Power: 22.8W | Speed: 5300 RPM
Dual-ball bearings have a lifespan of 67,000 hours and allows the fans to be laid flat or stand upright.
Connector: 4PIN; Lead wire: UL Type (+): Red Wire ; (-): Black Wire. FG functionYellow Wire; PWM: Blue Wire;
1 Piece fan include fan grill and mounting screws & nuts
International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

Package include: 1 Piece fan include fan grill and mounting screws & nuts Size:120x120x38mm Rated Voltage:12V Rated Current: 2.0A Connecter: 4Pin Speed: 5300RPM Air flow:213CFM Noise:58dBA Bearing type:Dual Ball Bearing Cable Length: 25cm Or 9.85 inches Life: 50000 hours Weight:294g/pcs or 10.4oz extreme cooling Gaming PC and Mining machine Fan, Hi-Speed 5300RPM with Airflow of 230 CFM, 2 ball bearing designed for extended life and high performance, 4 wire

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Brand	Wathai
Product Dimensions	3.81 x 11.99 x 11.99 cm; 390 g
Item model number	12038B12V4P2A
Manufacturer	Wathai
Color	120x38mm 12V Ball 4P
Voltage	12 Volts (DC)
Wattage	22.8 watts
Are Batteries Included	No
Item Weight	390 g

Wathai 12038 120mm x 38mm PWM Computer PC Case Fan 12V 4pin 5300rpm High Airflow Duall Ball CFM FG DC Brushless Cooling Fan

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