Infinite baffle question

I currently have a subwoofer box mounted to the floor joist in my living room under the couch for the home theater system . This box has two twelves' , one sealed , one ported . I am thinking about getting better speakers and running them IB . My question concerns the living room / basement distances and the sound canceling possibilities..., the two are separated by a door equidistant from the proposed speaker location at 16ft , so 32ft total distance . I suppose what I'm asking is , if the wavelength at certain frequencies will cancel too much when the separating door is opened to allow heat from the downstairs stove to migrate to the upstairs .
 
I would think you would have some loss below 40 hz with the door open. The other problem might be the door rattling which might require some padding on the door frame.
Having the heat come from under the woofer could cause some problems if you pushed the heat a bit.

The next concern would be potential fire spread if you planned to mount the woofers in the floor. A fire in the basement could easily spread after burning trough the woofer cone.
Have a room layout or pictures? You may be able to improve fire rating and increase path lengths with some additional speaker ducting in the basement.

Another question is the proposed location good for room modes? A room diagram might help in this case.

I have a pair of 18 inch woofers vented into the ceiling and I enjoy the effortless bass. Path length if some back door was left open is more like 70 feet. I also did some fire stopping on the back path in case someone had a Christmas tree light up near the woofer.
 
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A 1/2 WL of 32 ft is ~1128.583 ft_sec/2/32 = ~17.63 Hz fundamental, F2 = ~17.63*2 = ~35.26 Hz, so do this for F3, F4, F5 to get the strongest harmonics. That said, depending on the house's construction it could be a 'blessing in disguise'.