Square Duct/Box Transition Installation
Grille Mount Box Installation
Greenheck model ABD-GM is designed for applications where round duct terminates at a square grille. The
ABD-GM is supplied with a factory installed grille mounting box (see
Figure 7
). The grille can also be factory
supplied. Factory supplied grilles are shipped loose. Screws can be used to secure the grille mount box into place.
Installation into square duct requires a square to round transition. Greenheck model ABD-T is supplied with a factory
square to round transition. The size of the transition can be specified at the time it is ordered. (see
Figure 5
).
The square to round transition can be inserted into a square duct or plenum box (see
Figure 6
). Sheet metal screws
can then be used to secure the ABD-T into place.
Note: If the valve is installed in a continuous duct run, an access panel or door should be provided for periodic
cleaning, inspection, or adjustment.
Figure 6
Figure 5
Figure 7
4 in. model with 6 in. x 6 in.
transition shown
Automatic Balancing Dampers
3
®
