Question about fans and ductwork

So i have 3 aircooled hoods ducted together with a 6in fan pulling air threw them, would it help to add another 6in fan on the end of the duct line pushing?
Also its about 35 feet of ducting total from end of reflector line to outside.

Yes.

Unless it's in 10"-12" ducting, most likely yes. There's really no way to know for sure unless you measure supply and exhaust pressures. You're just shooting in the dark until you do.

At 35' through 3 hoods... some help is almost certainly required. Also consider how many bends in the ducting. Obviously there will be a few.

So yes. That 6" fans needs help for sure.

Yea i added the fan and it really improved air flow...i was afraid of over reving the first fan, its a active air 6in thats been running almost none stop for 6 years