Whistling sound - Panasonic Viera TH-42PZ80U Plasma TV

A whistling sound from the inducer fan of a gas furnace is often an indication of a problem with the fan, which could be due to several reasons such as:

1. Dirty or clogged fan blades: Over time, the fan blades can accumulate dirt, dust, or debris, which can impede the flow of air and cause a whistling sound. In this case, cleaning the blades can often solve the problem.
2. Worn out bearings: The bearings in the fan motor can wear out over time, which can cause the fan to make a whistling sound. If this is the case, the motor may need to be replaced.
3. Damaged or loose fan blades: If the fan blades are damaged or have become loose, they can cause the fan to vibrate and create a whistling sound. In this case, the blades may need to be repaired or replaced.
4. Improperly sized ductwork: If the ductwork is too small or improperly sized, it can cause air to flow through the system at a higher velocity, which can create a whistling sound.

It's recommended to call a professional HVAC technician to inspect and diagnose the issue with your furnace and perform any necessary repairs or replacements.

It a guess, but the batteries need replacing. Try that first.

There is a 'Sailor Clock', that is supposed to whistle!

https://www.google.com/search?q=melody+in+motion+clock+is+making+a+whistling+sound

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any part driven by the drive belt can do this

hissing vacuum leak at idle, louder with open throttle ...

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https://www.youtube.com/watch?v=tFoybr865n4
Jun 27, 2010 - Uploaded by fenixus
hissing vacuum leak at idle, louder with open throttle ... i know that my camera is poor and microphone suppresses high pitch ...Hi, my kia picanto engine also sound hissing/humming duringidling with open throttle. ... Loud whistling noise 2000 jeep wrangler 4.0l - Duration: 4:01. by Nasrac72 16,158 views.Missing: vt750c

A Whistle or metal sound with firing... - Honda Shadow Forums ...

www.hondashadow.net > ... > Technical Discussion

Jul 11, 2008 - ... under load (accelerating), that there is a small whistle or even 'tap on metal' high pitch sound ... Pics of my 2008 Shadow Aero 750 (VT750C ... loose bolt vibrating
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High pitch whine
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The whistling is possibly the alternator belt loading to charge the battery, listen to the noise and turn on the rear heated screen and headlight, if the pitch of the whistle changes then it's the alternator belt. Hope that helps.

To which make and model of camera does your comment refer ?

check the PCB balve maybe is cloged and the breather that create high vacuum wen are cloged and create a whistling sound.

Make sure the top (above the cones) and the bottom (ball) filters are clean. The whistling sound is due to the bottom filter either being clogged or poorly seated and the air is escaping around the rubber seal, making the whistling sound.

Turbo vehicles often sound like they are whistling when the turbo spools up because it is sucking in air at a high rate and it makes a bit of a whistling sound. Generally not a problem unless it is a different whistling that you are referring to.

Are the windows up tight and sealed?