On 9/30/2015 8:53 PM, micky wrote:
In alt.home.repair, on Wed, 30 Sep 2015 13:15:36 -0500, Bill Gill
wrote:

Everybody says to inspect your furnace filters, but they don't say what
to look for. On the TV news they always say it, then show a filter that
is completely clogged. Obviously they should be replaced before that.
So what should I look for to decide if I need to replace them. I have
been replacing them every 3 months, but when I do I can barely tell
the difference between the old ones and the new ones.

Bill

What kind of fuel are you burning?

It's gas, but what difference does that make? The exhaust
goes up the flue, not into the house. What the filter takes
out is dust in the air inside the house.

Bill