I've posting some questions regarding optical glass in the Dedicated Theater Design & Construction (http://www.avsforum.com/avs-vb/showthread.php?p=10242682#post10242682) thread -- and I don't want to cross-post -- but can anyone comment on the challenges of mounting the front-vented JVC RS1 behind optical glass in an adjacent room behind your theater?

Does it represent a problem and how close can you mount the projector to the glass without restricting the airflow?

Thanks

move it back 3 or 4 inches from the glass and use a bigger piece of glass if necessary

The users manual doen't provide any guidance here - unless they simply drew it wrong, that 200 mm dimension is to the rear, not the front. You would want to avoid a situation where the heated exhaust air was largely flowing back into the intake. A side oriented fan in front, blowing from the intake side, might help. Leaving ample space would also work, but the optical window gets large fast. You might even put a temperature sensor inside the RS-1 and check how the temperature changes as you shorten up the frront distance. Also, you could have a short tubular extension into the projection room, getting the window close to the front of the RS-1 but still leaving some front clearance on each side for air flow.

As to the window, there is a trade-off between thin and flat. Thicker windows are easier to hold flat, but they will introduce a larger gemetry shift and probably more chromatic abberation at the edge of the field. You will lose 8% of light ouptut unless you add a broadband A/R coating on each side. Edmund Scientific has some nice windows with multi-layer A/R coatings, for short money: C46-104 (4" diameter, $24.20; C43-973 (5" x 7", $31).
http://edmundoptics.com/onlinecatalog/displayproduct.cfm?productID=1919
The last one is in the paper catalog but not the web site. The flatness isn't specified, but is probably adequate. A 4" at 1/4 wave flatness will set you back $560 and probably be too thick.

Also, you could have a short tubular extension into the projection room, getting the window close to the front of the RS-1 but still leaving some front clearance on each side for air flow.


That's a good suggestion and apart from providing adequate clearance for the vents this method will also reduce hot air being directed/deflected in front of the lens which can cause wavy heat distortion type artifacts on the screen.

Thank everyone...good information and good suggestions. Thanks again.