can a duct be too big?

19 Oct.,2022

 

FRP Duct

if a 16″ sq A/C duct is called for (main trunk line)…  would it hurt if it was 20″ x 20″ if all the openings remained the same?

I know it’s a wide open question… but any thoughts… or facts and i’d be greatful

tell me why i’m wrong… I’m think’n… same amount of air come’n out of the unit (volume wise)  and same size vent/grill openings as the smaller duct…. so i just have a larger volume of air under a little pressure?

what about return duct size?  do i need to speed of the air that the smaller duct would give?

will larger duct have less noise? 

thanks in advance

Pony