A: Jim, good observation. For over a decade we have been promoting efficient terminations, and are well aware of the code, as we work closely with ICC on tweaks to the building codes. But, we do have customers in part of the county that have severe issues with birds and rodents, and as a worse case scenario, fall back on a screened cover.
As much as possible we promote our Premium Metal Dryer Wall vent, which was created to accomplish three things, 100% zero back pressure, duct cleaning accessible and a huge deterrent to bird and rodent entry. It has been an incredibly successful product for us.
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Answer provided by: Rick Harpenau (11/18/2015)