
New worry: resonant frequencies in grilles
I just saw something insane and my wife isn’t nearly as blown away as I am.
I heard this weird, high pitched noise while sitting on the couch. Comes and goes. Seemed like it might be my ceiling fan bearings going out or something. Yay, home ownership.
Well, I walk down the stairs to go take a shower and I hear it get loud as I walk past my return grille. Turns out, the fucking thing is resonating at about 1400hz. Frame isn’t loose, it’s just the blades. I can feel them vibrate and it stops if I rest my hand on it. They were pretty dusty, and it seems like that changed the airflow/mass enough. I cleaned it off and the noise almost went away but not entirely. Now I can’t unhear it and may end up needing to change it out 😂