The opening is the same for roof vents and A/C's...14"x14". As mentioned...the prep option is the pre-wiring within the frame. It could be the wires are there, as many manufacturers have a generic wiring harness that fits across several models but you will require 50A service to run both units. If you have 30A service and wish to install a 2nd unit, just wire it direct to a 120V line and use the 20A, 120V plug on the power pedestal near the 30 & 50A plugs.
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Don & April
"Bugsie" the Lab
2022 Melbourne Prestige
Retired @ PCB
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