"Jay Chan" wrote in message

The 6" inlet only has a 1.75" flange. Can I simply use a hose-clamp to
clamp a duct onto the 6" inlet? I am afraid that the 1.75" flange
doesn't provide enough area for the hose-clamp to lock the hose down.
Is there a better way to do this?

The clamp is only about 1/2" wide or less, so the 1.75" will be plenty to
grab. You canalways pop a couple of sheetmetal screws into it.