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Bath Fan Motor Retrofit Slotted Adapter Plate
A 150 x 80 mm ribbed adapter plate for mounting a universal replacement bath-fan motor in the original fan housing when the bolt holes don't line up. It has 4.5 mm slots for #8 / M4 screws: four radial motor slots cover 44–76 mm across on X and 44–64 mm on Y, and two end slots reach housing holes 96–140 mm apart. A 34 mm centre bore clears the shaft and hub, and 10 mm edge ribs keep it stiff.
Bath Fan Housing Offset Joist Tab
A gusseted Z-offset mounting tab for when a bath exhaust fan housing's sheet-metal tabs are bent, missing or don't reach the joist. It is 80 x 40 mm with 4 mm flanges and bridges a 16 mm housing-to-joist gap (the GAP parameter changes this). Two 4.5 mm slots give 12 mm of height adjustment and take M4 bolts or #8 sheet-metal screws through the housing wall. Two 5.5 mm holes take #8–#10 wood screws into the joist.
Bath Fan Grille Torsion Spring Bracket
This bolt-on L-bracket replaces the broken spring tab on a ceiling exhaust fan grille. It fixes the grille that falls because its plastic spring tab snapped off. Put the 40 x 20 mm base against the back of the grille and fasten it with two M3 screws and nuts through 3.4 mm clearance holes, 28 mm apart. The 24 mm gusseted upright has two 2.4 mm holes, 10 mm apart, that take the hooked ends of the original wire torsion spring (about 1.5–2 mm wire). The part prints on its side, so the spring pull runs along the layers instead of across them.
4 in Bath Fan Flex Duct Bolt Clamp
A split-ring clamp that holds 4 in (101.6 mm) foil or vinyl flex duct onto a bath exhaust fan collar or wall cap. It replaces the brittle plastic snap clamps that crack and let damp air leak into the ceiling. The ring is 106 mm ID with two grip ridges and a thinned flex zone opposite the split. One M4 x 35 bolt and nut (nut captured in the lug) close the 12 mm gap, so it clamps anything from about 102 to 106 mm OD.