Good call. Did you check to see if the flapper outside actually opened or not, somewhat, a little or fully?
Six 90's is too many. Beyond that let the seller and buyer hash it out. I'm not there to argue about it with a seller. If he thinks I'm wrong let him prove it, because I know if I wrote it I will be able to prove it.

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Accurate Inspections & Consulting, Inc.
773/844-4AIC
Markus Keller