1. | All fire dampers for duct connection must have sleeve extending through both sides of the wall. The sleeve thickness should be according to the prototype fire dampers that were tested and should be of minimum 1.5mm. Sleeve should be supplied by fire damper manufacturer and should be of full welded construction to withstand rough handling during installation. Fire dampers of thin-gauge-sleeve construction are easily distorted during installation resulting in failure of the damper to close fully. |
2. | The fire damper blades, when closed, should be within the wall thickness. |
3. | The wall and floor openings should be larger than the fire damper dimensions to allow for thermal expansion. Based on thermal expansion of steel, minimum expansion clearance should be 12mm for every 1000mm in the dimension of the fire damper. For stainless steel fire dampers thermal expansion clearance should be 50% more.Example 1.To determine the wall or floor opening size for your fire dampers, send us an e-mail. |
4. | It is important that the retaining angle should be large enough to provide at least a 50% overlap over the wall (on both sides of the fire damper) or floor (on all sides). For small and medium size fire dampers, retaining angles of 40mm is normally sufficient. For fire damper larger than 3000mm in dimension, larger retaining angles should be used. Retaining angles are an integral part of fire damper and, hence, should be supplied by the fire damper manufacturer. In Example 1, 40mm or larger retaining angles should be used for both wall- and floor-mounted fire dampers. In Example 2, 50mm or larger retaining angles should be preferred if the fire damper is wall mounted. As the fire damper sits on the wall, all thermal expansion clearance appears at the top of it. There should be a minimum of 10mm overlap of the retaining angles over the wall at the top of the fire damper. Hence, larger retaining angles are required for the wall mounted fire damper than the floor mounted ones. The floor mounted fire damper should be centrally position within the floor opening. |
5. | Depending on the regulations of local authorities, the annular space between sleeve and wall/floor opening may be filled with high temperature insulation or fire penetration sealant to prevent the spread of smoke through it. No fire penetration sealant is required between retaining angles and wall or floor. |
6. | The retaining angles should be installed on both ends of sleeves to hold the fire damper in position within the wall or floor. The retaining angles should butt against the wall or floor so that the fire damper is allowed to expand under fire conditions. Under no circumstances shall the retaining angles be fastened to the wall or floor. Also do not plaster the retaining angles to the wall or floor. No sealing is required between the wall/floor and the retaining angles. |
7. | When air grille is installed to the fire damper, the air grille frame should be large enough to cover the retaining angles so that they will not be visible as shown in drawings DAE 011 R1 and DAE 012 R1. For large multiple-module fire dampers when the retaining angles are more than 50mm, the opening should be cast with a niche as shown in drawings DAE 005 and DAE 006. to allow for installation of the grille. This results in an aesthetically much nicer grille installation and large grille frame is not required. Consult the fire damper manufacturer for the niche dimensions. |
8. | As a standard, fire dampers shall be connected to ductwork as shown in drawings DAE008 R1 (type A damper), DAE033 R1 (type B damper), DAE 010 R3 (type C damper), DAE 011 R1 (type G1 damper) and DAE012 R1 (type G2 damper); click to see the drawing. For higher pressure or velocity system, alternative connection is shown in drawing DAE 007 should be available upon request. All ducts must terminate at the fire damper. |
9. | Fire dampers may be installed on dry wall. Installer should ensure that similar thermal expansion clearances are allowed. The structural integrity of the partition to support the fire damper under fire conditions should be verified and endorsed by the builder. |
10. | Appropriate access panel should be installed for inspection and maintenance of fire dampers. Hence, they should be installed on the fusible and latch side of the fire damper and should be sufficiently large for replacement of fusible link. As a guide they should be at least 450 by 300 mm. Where access panel of this size is not possible, connect a short section of duct of about 600 mm long to one side of the fire damper so that it may be easily remove for access to the fire damper; the access panel serves as an inspection opening instead. Click Access Panels for details of type and sizes of standard OLS access panel. |