Kinpthy Endoscope Camera with Light,1920P HD Borescope Tools with 8 Adjustable LED Lights, Endoscope with Semi-Rigid Snake Camera, Inspection Borescope for iOS and Android-16.4ft Single Lens

I got one of these https://www.amazon.com/dp/B0C4V5LWWL and then something like this https://www.amazon.com/Holikme-Cleaning-Remover-Fireplace-Synthetic/dp/B07SQYX2FH/ and blue taped the camera to the rod, without the brush and fed it through to get a look. There's an app on the cellphone (I'm on Android) that you can record the video. You might tape the nylon rods together because if you turn them the wrong way they can unscrew inside the vent, which would be very bad.