What is the capacity of the 81-052?

A contractor from 2447 Beta Ave., Burnaby, BC Canada says:
February 7, 2012
Hello!
We want to request the Rating or capacity of the roller assembly of your 81-052.

Thank you,
Gus
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Tom from SWISCO responded:
February 9, 2012
Thanks for posting, Gus. The weight capacity of the 81-052 is 300 pounds per unit; so a 600 pound door for a pair.
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