Type: Posts; User: wnharris
makes a nice house for a squirrels under there
haha, that's the way to fix the problem!
the larger the duct size, especially with flex, the less air noise you will notice.
personally, in this case i would install no smaller than 18" and would advise a 20".
as far as the filter...
a high efficiency furnace is condensing by nature, so that answers the questions.
sound like you either have a drain overflow or a bad condensate pump (if you have one).
Thanks for the info, will have all of this ready for the accountant next year!