Framing for Air Conditioner

[silver 67]

At the opening for the air conditioner on the roof are the 2.2's that frame the opening suppose to be curved to match the curved roof or should they be flat to match the bottom of the air conditioner?

Thanks,

silver 67

[Smokin Camel]

Having just put a new AC in I know what you are talking about.

The 2x2's are to provide a base when screwing down the inside frame against the gasket---something to provide resistance and prevent the roof & wall/ceiling from getting crushed together. If you have the curved ones it seems logical to use them as there would be less stress on the skin. Mine were not curved but were shortened and served fine.

I have heard metal spacers (Aluminum) are best, in the event of a condensate leak--makes sense, but a decent installation should negate that problem.

[Silverwanabe]

Hello,

On my 67, it was not ordered with an ac.
I had cut into the skins, fabricate C channels from aluminum L angle to create support for my heat pump. I used Olympic rivets for strength.

I have a few pics below.

So far so good, no leaks.