Best Electric Extractors?

[jenkinsbrynmair]

haven't tried the tangential screen that can be fitted as probablyneed another counterbalancing it to make it practical

you need the full set of four for it to be practical

 

[Rory Fields]

you need the full set of four for it to be practical

I didn't realise this - dyu mean in terms of efficiency or that an opposing frame of similar weight placed tangentially still doesn't quell the extractor's attempts to cross the room?