On Tue, 19 Jun 2007 11:53:11 -0700, wrote:

On Jun 18, 11:13 pm, Kbalz wrote:
Hello, I just took possesion of my home this week. I went in the
basement, and the furnace was making a horrid high-pitch sound. It
was the air filter, a 3-month Anti-Allergy one that was completely
full of dumb-cat air.. So I took out the airfilter (AF), and the
noise stopped.

I went to local store to buy new one. I bought wrong size... too
long. It fits in the AF slot, but it sticks out about 2 inches each
side.

I took out the AF, and put the metal guards back on the insert slot.
So, my furnace has no AF. My AC/heat system is list as OFF, I will
not be living there for another 5 days.

If the system is off, is no AF ok? Its been no AF for 2 nights. I'm
panic-ing that my place will burn down now lol. Its a long drive,
several hours. Will it be okay for another 48-hours? Thanks,

First, relax.

Second, think.

How could any amount of offal from smart/dumb dog/cat/human
collecting on a mechanical air filter cause the fan motor to make
noise?

I think it is the filter that is whistling because it is clogged. Air
speed though the remaining openings has increased.

I bought some cheap little accessory to make my filter whistle when it
is clogged, but because of the way the filter is mounted, I can't get
the whistle into the slot. But the principle remains the same.

Could you identify an electrostatic from a mechanical filter?

Never saw any cat panicking like this. Dumb or smart.

J