How to Specify
Use the engineering data files to determine the proper size to use for maximum performance. Refer to the submittal drawing for key product dimensions.
How to Purchase
FAQs for GRDs

Available sizes (inches)
|
Height |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
6 |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
8 |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
10 |
|
|
• |
• |
• |
• |
• |
• |
• |
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
12 |
|
|
|
• |
• |
• |
• |
• |
• |
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
14 |
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
16 |
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
18 |
|
|
|
|
|
|
• |
• |
• |
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
20 |
|
|
|
|
|
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
22 |
|
|
|
|
|
|
|
|
• |
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
24 |
|
|
|
|
|
|
|
|
|
• |
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
25 |
|
|
|
|
|
|
|
• |
|
|
• |
|
|
|
|
|
|
|
|
|
|
|
|
|
26 |
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
28 |
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
30 |
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
32 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
• |
|
34 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
• |
|
36 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
• |
|
38 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
• |
|
40 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
• |
|
42 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
• |
|
44 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
• |
|
46 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
• |
|
48 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
• |
Other sizes available upon request.