On Sat, 30 Apr 2005 09:00:37 -0400, "Tony Marsillo"
wrote:

As Richard said, that is the safty interlock. Unless the inlet cover is
installed the blower will not run.


Made a final check. It is an impeller cover interlock switch. The
sponge packing around it was hardened and hid the switch mechanism
from my sight. Thanks.