I've attached an image of my living room. The distant from the wall to the very end of the mountable ceiling is 14 feet, but the fan hangs down 20" and the mount will make the lens of the projector hang down to about 10". Projector central shows that the image will end up 14-20" below the lens. Is this enough to clear the fan and if not could I mount the projector in one of the corners of the room and project diagonally?

http://img239.imageshack.us/img239/7422/hc1500placementna4.png

Or, is there any way to determine the angle of the beam?

I have the same type of a fan hanging in my room where I'm about to hang my HC1500 probably tomorrow.

At 10ft, the picture is about ~ 13.8" below the lens and the lowest point on the fan is at 17", 5 feet away from the PJ lens.

10ft /5ft = 2
13.8" / 2 = 6.9"

So at 5 feet, the image is ~ 6.9" below the lens.

17" - 6.9" = 10.1"

So, in my case, the lens needs to hang at least 10.1" from the ceiling to avoid hitting the lamp on the fan.

My ceiling is 90.5" high, and the picture is 46" high.

90.5" - 46" - 13.8" - 10.1" ~ 20.6"

So the bottom of my image will be ~ 20.6" off the floor.
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Now, WillPower, use the same calculations to approximate with, decent accuracy, where your picture will be.

We need to know how high your ceiling is, where exactly the fan is located, etc.

At 14ft, your image will be at ~ 17.6" below the center of the lens. Lets assume ceiling fan is at least 7,0ft away,

10" + 17.6/2 = 18.8" < 20"

This means you'd have to hang your PJ lower or tilt it downward but like I said, we need the exact distance from the fan.

Sweet. So let's see.

~13ft from wall to front of lens
66"/12 = 5.5ft from front of lens to lower corner or fan
13/5.5 = 2.36
17.9 lens difference / 2.36 = 7.57"
20" fan drop - 7.57" = 12.43"
92" ceiling to baseboard - 53" image height@13ft - 17.9 drop - 12.43 mount =
8.67" from the baseboard (12.67 from the floor)

Does that look right?

if the center of your lens hangs down at 12.43", then at 5.5ft

12.43" + 7.57" = 20" vs the fan at 20"

so, if I'm reading your info correctly, you're really close to where to want to be.

your calculations look just about right :) the 12" at first seems kind of low - what is your sitting position?

Easier and cheaper to just replace the fan with a flush mount variety, then you can mount the projector higher, and your screen does not start at the floor.

You could also mount the projector lower and use the keystone correction to get the image higher on the wall.

I've attached an image of my living room. The distant from the wall to the very end of the mountable ceiling is 14 feet, but the fan hangs down 20" and the mount will make the lens of the projector hang down to about 10". Projector central shows that the image will end up 14-20" below the lens. Is this enough to clear the fan and if not could I mount the projector in one of the corners of the room and project diagonally?

http://img239.imageshack.us/img239/7422/hc1500placementna4.png

You do not give your screen size. The larger the screen the larger the drop. With 13' throw and 10" for ceiling to lens distance, if you use a 100" screen the image will hit on the fan.

You do not give your screen size. The larger the screen the larger the drop. With 13' throw and 10" for ceiling to lens distance, if you use a 100" screen the image will hit on the fan.
I don't have a screen size in mind. I'll just build or buy one to fit my needs after I get everything set up. 10" was also just a guestimation based on the height of the PJ and the mount I'm looking at. The calculations above seem to recommend 13" if I want to mount from the ceiling.

Based on this (http://www.projectorcentral.com/Mitsubishi-HC1500-projection-calculator-pro.htm), At 13' The screen can do two sizes (in inches):

1. 90 D, 44 T, 78 W
2. 109 D, 53 T, 95 W

So we can use those for reference if you want.

the 12" at first seems kind of low - what is your sitting position?
My seating position would be directly under the projector. There are two coffee tables to the left and right that I could mount it on to project an image upwards if I wanted to. I'm also wondering if I could angle the projector from either corner of the room to clear the fan.

Easier and cheaper to just replace the fan with a flush mount variety, then you can mount the projector higher, and your screen does not start at the floor.

You could also mount the projector lower and use the keystone correction to get the image higher on the wall.This is an idea too! I'll go look at home depot and see if they have adapters (i found some online for 12$.) since my fan already had something like an 8 inch pole from the ceiling to the body.