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That sounds like a well thought out door operator. And you have tested for 4 years so sounds durable as well. JT

+1 for not using a photocell to control the door, also note that the photocell will most likely close the door too early. I can't comment on commercial doors because I made my own. However if your a little bit handy there is a thread here on a very well designed door by @Tsheaby in this thread. JT