"Peetie Wheatstraw" wrote in message
...
On Fri, 16 Jan 2009 09:08:15 -0500, "C.D" wrote:


I measured again last nite. The burners fire, the blower kicks in,
and about 40 seconds later, I get the big POP!

I 'm pretty sure it has to do with increasing temp in the supply
(not return) ducts.

Thx,
Peetie

my furnace does the opposite. i get the loud POP when the blower shuts
off.

Immediatly? Before it's had any time to cool off?

yep.

--
C.D