In article , MNRebecca wrote:
Thanks again, all, for the suggestions and the physics lessons!
R.


The installers are simple minded. Sometimes snow then water will get
into the switch. First the switch may shut off if there is no air flow,
but if there is some flow the switch can be damaged, and
you have to deal with getting parts. Just like my brothers
up maybe a couple feet, and snow drifts can get higher than that, and have in Md.,
and the forcast is for up to 36 inches in Md this weekend.
There is also a rule of staying away from chinneys and other walls, and optimun
pipe spacing between the 2 pipes is 3 feet.




greg