I've been trying to change my room around to accomodate all my gear including a pj, a tv and a computer desk.

The ideal location for my PJ would be 44" @ a 45 degree angle down and to the left.(lens to intakes' closest bottom left corner)

This would be shelf mounted off that back wall, so there would be a solid board beneath the PJ and it extends past the PJ in all directions by a few inches.

This room is temp. controlled and only sways 2.5 degrees each day at most.



Is this o.k.? What about adding an air filter to the underside of the shelf it is mounted on that extends even further from edges to clean the "upswell" of air that comes slowly from the left and below?

Anyone with an opinion either way?

An air filter won't do much good when placed out in space. The air that could go through it will simply choose to go around it because it would pose a large restriction.

If you were placing it a foot or so away from the intake, I would be slightly concerned, but 44" away would probably see the same air currents as 6 or 7' away. The air velocity would be highest around the intake and then fall off very quickly as you move away.

I usually think of this as the surface of spheres of varying diameter through which the air passes.

For example, say that you have a hypothetical circular intake 12" in radius and the blower moves 1600 cfm. That means the air is moving at 509 fpm at the surface of the intake itself. Moving out 12", you have a semi-spherical shape with radius 24", surface area of 25.1 sq. ft and the air speed drops to 64 fpm. Move out to your 44", for a semi-sphere with radius 56", surface area of 137 sq. ft and the air speed is 12 fpm. These shapes of course would change if the air intake is near a wall of other obstruction and reduces the surface area of the sphere (thereby increasing air velocities).