Oh, so it's the input or return, unheated air to the furnace that needs 55 sq in.
My installation may have that (or not). I'll check this weekend.
But if it's drawing in through 55 sq in it seems to me it would be better if it's putting out through 55 sq in so as not to restrict the air flow too much. I would definitely prefer that model number NT-20SE with the large front grill. And as you say, the easy access would be a plus. Wonder why they switched? I've seen pictures of the Elkmont with that model installed, and originally thought ours was one of them.
Heh, at least ours is screwed down. It also has a little plywood box around it. Not sure why ...
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