Fantech recommends a minimum of eight feet of insulated flex duct between the exhaust inlet register or grille and the fan motor. The company does not cite a maximum exhaust duct length. Maximum vent fan duct lengths are discussed in a reader Q&A below.
in the plans for my basement remodel, the architect has called for two medium/
I am replacing an old noisy bathroom exhaust fan that currently has a 4" roof jack/
North America's largest producer of residential ventilation products such as Kitchen Exhaust Range Hoods, Bathroom Exhaust Ventilation Fans and Whole .