4 in to 2.5 in bushing
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bushing to fit a 4 in vent cover to a 2.5 in diameter vent opening on the side of a house
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Adapter to fit a 4 inch vent cover to a 2.5 in internal air vent fitting.
For whatever reason, the bathroom fan exhausts on my home are 2.5 inches diameter; but the smallest easily available commercial exterior fitting is for a 4 inch diameter fitting. This fit my chosen vent cover (4 inch No Pest Vent brand) and with a small length of pvc pipe (2.5 inch pvc) and with some silicone, made it work.
Gotta love when builders use non-standard fittings… Or when standards change and commercially available product lines only cover the latest standard/code…