Originally Posted by ctzalla
This is all very interesting, especially the project room. I'd simply have to wonder ask if the projector I'm looking at, the BenQ 2050, could handle that throw ok. I guess if I assume 4 feet or so for the screen wall (?), and lets say the same for the projector room, that leaves me with a 19x15 theater room, which should easily fall within the limits of what the projector can do without loss. The question now becomes whether or not that is enough room, lol.
Oh, and your HVAC comment made me realize one glaring emission from my room description. There is one HVAC duct line running the width of that room that basically bisects it.
Check the manufacturers website and/or google for calculators that account for your exact projector. Tons of resources to determine throw distance.
As for HVAC, get ready to move and relocate IF you want an ideal ceiling. My personal theater required movement of the furnace and the main return duct work to the hall outside the room. Was very expensive, however I did not want a weird soffit mid way through the room (or bisecting as you stated correctly).
In my opinion the two areas that don't get paid enough attention in theater designs are: HVAC and the door to the room. Both are critical (the door more so for sound proofing efforts). HVAC is step #1
before you even demo. You need a game plan here or it gets real expensive real quick (think re-do effort). CALL some shops to come out and shoot the bull with you about this. Many are not "theater aware", however if you have a list of requirements you can usually find a shop or two that get creative (read: do what you want AND provide critical guidance) without the typical DIY mistakes.
My criteria for HVAC at a high level:
Little to no airflow noise (proper duct work sizing is key)
No shared ductwork with the rest of the house (dedicated ducted mini split....look it up).
Properly sized for not only the # of people (max) in the room but also properly sized returns (do NOT skip returns...you will be re-doing the hvac after day one if you do).
Wiring accounted for BEFORE drywall. This is especially important for mini split installs (i.e. 220 line required). It's easy (and cheap) to run 220 lines before drywall. It's infinitely harder (impossible without destruction?) after drywall.
Crawlspaces are awesome (basement theaters apply) for hiding ductwork and sound reduction. I've been told some fairly ridiculous advice about how to sound proof when dealing with a crawlspace. 2 layers of 3/4" T&G with 9mm rubber matting below that (and green glue between it) speak otherwise. I need to post some pictures of my personal theater. You can't hear squat and I did it "wrong" per alot of the HVAC "experts". Theory vs reality trump all here. I can talk for days on this topic.