Double door system

Recently I was fortunate enough to go on a week long road trip into the wild canadian landscape.

I had never been into canadian territory before & was super enthusiastic to embark on this trip.

The only thing that entirely upset me was the chilly & temperamental weather we were about to encounter during the end of canadian winter. My enjoyable friend and I currently reside in a warm & humid semi-tropical weather conditions & I’ve become embarrassingly accustomed to having warm air around me at all times. The prospect of dealing with chilly & blustery winter weather was not something that blissful me, however I decided it was worthwhile to go on the trip anyways. When we arrived at our destination I was completely impressed with how the citizens have adapted to living in such a difficult weather conditions! Everyone wears heavy winter clothing to support an active outdoor lifestyle up there. They walk from place to place in thick boots & Eskimo coats rather than relying on boilers aboard cars & buses. They have also figured out an ingenious way to keep chilly air out of their residential spaces, then namely, this expensive 2-door entry system that I encountered at several locations served to efficiently trap warm air inside & chilly air outside. The premise was simple; there was a vestibule with two doors leading to the interior & only one automatic sliding door would open at a time. After passing through the first set of doors, you had to wait patiently for that passage to completely close before the next door would slide open. It greatly limited the amount of winter air that could rush into the indoor space, then sure, it took a few extra seconds to enter each building, but this system was highly effective at keeping the brutally chilly outdoor air outside where it belonged.
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