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1. INITIAL DAMPER TEST - Before installing Damper into concrete slab, 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 slab penetration is at least 26mm larger than the damper size. Example: 400 x 250 damper requires an opening 426 x 276 (see illustration).

3. Remove flange screws and detach flanges from casing. NOTE: Dampers are clearly marked with "AIRFLOW" direction and "TOP" of unit these must be adhered to.

4. Slide damper down into opening.

5. Replace flanges making sure damper is firmly fixed within the slab.

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

7. 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.)