Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.*
Round Bath Fan Grille With Slotted Spring Ribs
A 180 mm round replacement grille for older round-housing ceiling bath fans that no longer have a grille available. It covers housing openings up to about 170 mm and has a 104 mm vented field. Two upright ribs have 24 mm-long M3 slots, so a pair of standard replacement grille torsion springs can be bolted on with M3 screws and nuts at any spacing from 48 to 96 mm to match the spring slots in your housing.
4 in Duct Backdraft Damper Flap
A print-in-place gravity backdraft damper that drops into a 4 in (101.6 mm) round bath-fan duct: a 100.6 mm OD sleeve with a 94.4 mm hinged flap that the fan blows open and gravity swings shut against seven moulded stops, replacing the snapped or missing flap in an old exhaust fan. The 114 mm flange butts the duct end and carries three 3.4 mm holes for M3 / #6 sheet-metal screws; the hinge runs on integral 4 mm pins in 5 mm sockets, printed in one piece with 0.5 mm clearances.
Bath Fan Outlet To 4 in Duct Adapter
A transition that bolts over the flat oval/rectangular side-discharge outlet of an old bathroom exhaust fan housing and converts it to a plain 4 in round duct collar, so a modern flex duct clamps straight on. The 150 x 94 mm mounting flange carries a 110 x 56 mm port opening, four 4.5 mm M4/#8 screw holes at ±64 x ±34 mm plus two 14 mm adjustment slots, and the collar is Ø100.5 mm x 22 mm tall with a 45° retaining bead; overall height 70 mm.