Installation Instructions for:
CURB MOUNTING*
NV-90 and NV-120
*For installations using Greenheck's optional roof curb.
1. Assemble Roof Curb
Curbs are shipped knockdown and require assembly by others. Assembly instructions are also included with curb.
Assemble curb sections as shown using hex bolts and lock nuts supplied with curb.
Detail shown is typical for all four corners.
Roof Curb |
| |
| 41/2 | |
2. Locate and Cut Roof Opening | 241/4 | |
| ||
When locating unit, make sure there is room to access unit |
| |
from all sides. Make sure inlet of this unit is located well |
| |
away from exhaust fans. | Recommended | |
405/8 | ||
Roof Opening | ||
Roof Opening for | (36"x36") | |
| ||
| 1031/2 | |
3. Install Curb |
| |
Located curb over roof opening with dimensions shown to |
| |
the right and fasten in place. |
| |
| 431/4 | |
Check that diagonal dimensions are within |
| |
± 1/8" of each other and adjust as necessary. Shim as |
| |
required to level. |
| |
A | 813/16 | |
| ||
B |
|
4. Install Ductwork
DThe following chart shows the duct sizes and straight
Roof Opening |
|
| lengths recommended for optimal performance (AMCA | |||||||||
|
|
|
|
| Publication | |||||||
Ductwork |
|
|
|
| recommended lengths will affect fan performance. Good | |||||||
by Others |
|
| C | duct installation practices should be followed for the | ||||||||
Roof Curb |
|
|
|
| remaining ductwork. |
|
|
|
| |||
|
|
|
| Duct Locations: |
|
|
|
| ||||
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| A | B |
| C | D | Straight |
|
|
|
|
|
|
|
| Duct Length |
| ||||
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 24 | 93/8 |
| 24 | 301/4 | 81 |
| |
|
|
|
|
| 26 | 91/2 |
| 26 | 291/4 | 96 |
| |
9