AUPU Ultra Silent Series of Bath Fans: . * 14 models: AFS80G1-G6, AFS110G1-G6, AFS80L1 &AFS110L1. * Airflow:80CFMor 110CFM. * Noise: < 0.3soneor 0.7 sone. * Veryefficient to remove moisture, carbon dioxide and odors. * Long-life motor. * Metal housing with rust-proof paint. * Built-in damper to prevent air-back draft. * Easy installation, with adjustable mounting brackets included. * Duct diameter: 4" (or 100mm). * Certifications: UL, cUL, HVI, ENERGY STAR, ... * Color of grille: silver and stainless steel. . Keywords: fan, bath fan, exhaust fan, bathroom fan, ventilating fan, ventilation fan, ventilator, ceiling exhaust fan, ducted exhaust fan, greenhouse exhaust fan.