For our northern customers that have heavy snow, there is a slot in the head that allows the unit to breath when the top is covered. So there will be no snow plugging unless the entire roof is covered with about a foot of snow.
"I installed myself and all seems to be going well. The squirrels are no longer knawing on the lead covering on my vent pipes, which is good news, not only for me but the squirrels too! Thanks for following up on your product!"
D CWrightsville Beach, NC
"Installed and working great so far! Thanks again."