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1. INITIAL DAMPER TEST - Before installing Damper into wall, check damper's closing operation. This can be achieved by removing UL33 rated fusible link. Hold the damper in a stable upright position, then using the link strap or the "cricket bat", push the blade vertically to the top. This will clear the blade over the two locking tabs. Pivot the blade back against the stainless steel spring(s) to the fully open position, then let the blade close and lock. Replace fusible link and close link strap.

2. Ensure wall penetration is correct size. Opening should be 10mm larger than nominal size in both width and height. Example: 400 x 200 damper requires an opening 410 x 210mm (see Illustration).

3. Remove flange screws and detach flanges from casing.

4. Apply a bead of fire rated mastic to base of penetration and around the penetration where fixed or bolt-up angles seal against fire rated plasterboard.

5. Slide damper in wall penetration and locate centre of penetration. NOTE: Dampers are clearly marked with "AIRFLOW" direction and "TOP" of unit.

6. Pack top of damper expansion gap with 22mm Nom. Dia. Fyreguard IBS rob and seal top sides with fire rated mastic to a minimum of 5mm thick.

7. Replace flanges with a bead of fire rated mastic around penetration where angles seal against plasterboard. NOTE: Do not overtighen flange screws.

8. Repeat INITIAL DAMPER TEST as outlined in point #1.

9. Connect ductwork to fire damper using fire rated mastic to fill recess if using raw edge connection, or apply mastic to both surfaces of the TDF flange connections. (Bolts must be of a low melting point material.)