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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 436 x 276 (see illustration).

3. Remove bottom flanges and slide damper down into slab penetration. NOTE: Dampers are clearly marked with "AIRFLOW" direction and "TOP" of unit these must be adhered to.

4. From underneath side of slab reattach bottom flanges sealing between flanges and slab as shown on diagram with approved fire rated mastic. NOTE: Do not overtighen flange screws/bolts.

5. From top of damper, remove 2x opposing side flanges and pack the expansion gap completely with an approved high temperature ceramic fibre insulation. Replace flanges, sealing between the flanges and the slab with an approved fire rated mastic. Repeat this method with the last 2x opposing flanges.

6. Now that the damper is securely fixed and sealed within the slab 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.)