To ensure that the rafters or joists do not interfere with installation of the plenums on a curb-mounted rooftop unit:
A) The roof curb must be square with the roof joists or rafters.
B) The roof curb must be installed diagonal to the roof joists or rafters.
C) The roof joists or rafters are cut out where the curb is installed.
D) The plenums are fabricated in place with the roof joists or rafters passing through them.
A
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