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Units Chart & Frame Heights

Sometimes, frame heights are expressed in units ...

Units are 1 3/4" increments of panel space (per the EIA-310 standard). For instance, a frame with 35" of panel space is a 20U frame.

Here is a chart chart showing units and the associated panel space.

Units

Decimal

Fraction

  

Units

Decimal

Fraction

  

Units

Decimal

Fraction
1 1.75 1 3/4   20 35.00 35   39 68.25 68 1/4
2 3.50 3 1/2   21 36.75 36 /34   40 70.00 70
3 5.25 5 1/4   22 38.50 38 1/2   41 71.75 71 3/4
4 7.00 7   23 40.25 40 1/4   42 73.50 73 1/2
5 8.75 8 3/4   24 42.00 42   43 75.25 75 1/4
6 10.50 10 1/2   25 43.75 43 3/4   44 77.00 77
7 12.25 12 1/4   26 45.50 45 1/2   45 78.75 78 3/4
8 14.00 14   27 47.25 47 1/4   46 80.50 80 1/2
9 15.75 15 3/4   28 49.00 49   47 82.25 82 1/4
10 17.50 17 1/2   29 50.75 50 3/4   48 84.00 84
11 19.25 19 1/4   30 52.50 52 1/2   49 85.75 85 3/4
12 21.00 21   31 54.25 54 1/4   50 87.50 87 1/2
13 22.75 22 3/4   32 56.00 56   51 89.25 89 1/4
14 24.50 24 1/2   33 57.75 57 3/4   52 91.00 91
15 26.25 26 1/4   34 59.50 59 1/2   53 92.75 92 3/4
16 28.00 28   35 61.25 61 1/4   54 94.50 94 1/2
17 29.75 29 3/4   36 63.00 63   55 96.25 96 1/4
18 31.50 31 1/2   37 64.75 64 3/4        
19 33.25 33 1/4   38 66.50 66 1/2        

To find the overall height of a vertical frame ...

use the panel space above and add a figure from the chart below.

When the vertical fame has ...

Heavy Duty

Challenger
No base 5.375" (5 3/8") 4.125" (4 1/8")
Recessed Base 8.875" (8 7/8") Not Available
Flush Base 8.875" (8 7/8") 7.125" (7 1/8")
Base & Casters 8.875" (8 7/8") 8.125" (8 1/8")
Truck & Casters 11.875" (11 7/8") 10.625" (10 5/8")
Dolly & Casters 11.875" (11 7/8") Not Available

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