Fantronix
Fantronix is a company that specializes in a large number of ventilation products. They have it all here! From domestic use ventilation to industry and public grade ventilation as well. They provide various products like extractor fans, grilles and vents, and hydroponics which help in small and large-scale agriculture. Their products are available through trusted sources on sites like Amazon, eBay, etc. They also deal in ventilation hubs which makes them easier to use.