Daktronics AB-1600-1.5,2.5 - Manual (Page 20)

2-4 Mechanical Installation
2.5 Display Ventilation Requirements
Reference Drawings:
Mounting Example, Small Line Displays ............................................... Drawing A-101424
Label, Filter Clearance .......................................................................... Drawing A-141064
Daktronics small matrix displays use fans to prevent overheating. The fans bring air into the cabinet
from the bottom of the display, creating positive pressure within the display. The fans then force out
the warm air within the display through small gaps above each of the lenses, cooling the lamps and
lowering the internal temperature of the cabinet. This continuous cycle of airflow extends the life of
the lamps and decreases the maintenance costs associated with overheating.
If mounting another sign or structure on top
of one another, maintain a minimum of 2
1
/
2
O. This is to ensure proper airflow through
the sign and to allow easier access for filter
removal. Refer to Figure 27 and Drawings
A-101424 and A-141064.
In some circumstances it may be necessary,
or desirable, to mount a small matrix display
within another structure or to “skin over” one
or more displays. If enclosing a display in
this nature, adequate openings must exist in
the outer structure for air intake.
If enclosing a small matrix display within
another structure or “skinned over,” observe
the following specifications to prevent
display damage and premature lamp failure:
• Provide twelve square inches of unobstructed opening per module for adequate display cooling.
Make allowances to compensate for the percentage of screen in the material covering the openings
in the enclosed structure.
• If forcing air into the enclosed area, it should run at 110 cubic feet per module (one module = 20"
x 40" display active area or eight rows x 16 columns of lamps).
For example, a 16x80 double-face, small matrix display inside an enclosed structure would require
240 square inches, or 1.7 feet, of unobstructed opening in the bottom of the center cabinet.
(2 displays (16x80 pixel size))/128 pixels per module = 20 modules
(2(1280))/128 = 20 modules
2560/128 = 20 modules
20 modules x 12 square inches = 240 square inches or 1.7 square feet
Also, if forcing air into an enclosed display, adhere to the following filter specifications:
• The effective filter area is to be no less than 2.3 square feet per 1.0 square feet of filter face area.
• The filter media is to have an average arrestance (resistance to debris) of 90-92%.
• Initial resistance should not exceed 0.48 w.g. (water gauge) at 500 fpm (feet per meter).
Figure 27: Minimum Clearance for Sign Bottom