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IF HEIGHT <=11.00 in. (279mm)
IF HEIGHT >11.00 (279mm)
6 in. (152mm)
18 in. (457mm)
6 in. (152mm)
18 in. (457mm)
6 in. (152mm)
6 in. (152mm)
18 in. (457mm)
18 in. (457mm)
Installation Instructions
Greenheck’s IMO dampers were tested per the International Maritime Organization’s Fire Test Procedure (FTP) code in a
Class A bulkhead and in a Class A deck for 60 minutes. The FTP code requires that the ductwork (coaming) be insulated
and that the damper be bolted or welded to the duct.
1. Insulating the Duct
The ductwork must be insulated a minimum of 6 in. (152mm) on the damper side and 18 in. (457mm) on the non-damper
side (see figures 1-4). Any US Coast Guard type approved insulation with an A60 rating can be used. The insulation is to be
installed on the duct with 0.106 in. (2.7mm) steel pins and 1.12 in. x 1.24 in. x 0.4 in. (28mm x 31mm x 10mm) steel clips.
2. Attaching Damper to Duct
The damper can be installed to the duct using either bolts or welding. If bolts are used , they are to be a minimum of 0.375
in. (9.5mm) diameter and 1 in. (25mm) long. The fasteners should be spaced 6 in. (152mm) OC and a maximum of 2 in.
(51mm) from the corners.
Fig. 1
Fig. 2
Vertical Airflow- Horizontal Damper mount
Fig. 3
Fig. 4
Horizontal Airflow- Vertical Damper mount