The best replacement for inline fan is booster fan.

The best alternatives to inline fan are rated as following:
★★★★★  booster fan
★★★★  squirrel cage
★★  blower
★  exhaust fan

Your alternative for inline fan is not listed? Suggest!
Speaking about inline fan, one probably shouldn't forget about speed controller.

Other search terms related to inline fan and their ratings are:
★★★★★ speed controller
★★ carbon filter
★ charcoal filter
You have in mind a companion for inline fan and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of inline fan in all years. Click on graph for more.
inline fan
booster fan
squirrel cage