Which imported brand of home fresh air system is better in Xuzhou?

Duct Mixed Flow Fan
Product Description
Purpose
Air supply and exhaust systems installed in different buildings.
Can be installed in kitchens, bathrooms and other humid places.
Situations with high wind pressure, large air volume, and low noise ventilation requirements.
Compatible with circular air ducts with diameters up to 1 mm.
Features
Shell composed of impact-resistant and corrosion-resistant plastic material (diameter to) and low flammability polypropylene material (diameter to).
Equipped with turnable junction box.
The special shell fixation method makes it easy to disassemble and repair the fan without removing the air duct.
Motors
Ball bearing two speed single phase motor.
Equipped with overheating protection.
Speed Control
Built-in switch (optional) or external switch for fan speed adjustment (can be ordered separately).
With a built-in speed controller (optional) or an external thyristor speed controller (can be ordered separately), the speed can be adjusted smoothly.
Installation
Due to the compact design, the fan is intended for installation in limited areas including ceilings.
Fans can be installed in any area of the ventilation system, from the front of the ventilation system to the end of the duct.
Wall or ceiling mounting possible via mounting plate.
Used to install fan accessories of the same diameter in parallel (used to increase air volume).
Used to install a series of installation accessories of the same diameter in series (to increase air pressure)