Abstract: A grease filter assembly traps more than 90% of grease from cooking activities entrained in air, and may be used in commercial range hoods. An exemplary grease filter assembly comprises a housing, an intake baffle assembly, and an exhaust trap baffle assembly. The housing is configured to house and support the intake baffle assembly and exhaust trap baffle assembly to form a single grease filter assembly. The intake baffle assembly includes air-splitting and air-redirecting baffles configured to work in tandem as a first stage. The exhaust trap baffle assembly includes a diverter array and a spacer array that forms a second stage. Exhaust air is thus directed through a tightly-defined serpentine-shaped region in the first stage and around the air-diverting baffle array in the second stage to cause increases in air stream speeds, turbulence and/or resulting pressure drops that greatly increase removal of grease from exhaust air.