Power Smoke detector L1, HOT 165ºF Damper 2 1 Actuator Switch made when damper is open To alarm system Switch made when damper is closed FIGURE 2. Common containment-damper wiring. Fire/smoke damper Smoke Test panel Push to test Hot Damper closed Closed Com Damper open Open Switches Actuator Hot detector or relay contact 165°F Com Primary heatresponsive device N, COM What is the minimum size and thickness of mounting angles? Minimum size and thickness can vary by manufacturer. Typically, the minimum size is 1.5 in. by 1.5 in. (38 mm by 38 mm). For dampers up to 36 in. (914 mm) wide and 24 in. (610 mm) high, the minimum thickness is 16 gauge. For larger dampers, the minimum thickness is 14 gauge. When do you use one-sided mounting angles in lieu of two-sided mounting angles? You use onesided mounting angles when one side of a rated wall is diffi cult to access or inaccessible. Is a one-sided mounting angle better than a two-sided mounting angle? Both one-sided and two-sided mounting angles are tested and approved by UL. One-sided mounting angles can be more economical to purchase and install, but typically have more restrictions in terms of size and hourly ratings, the limitations varying by manufacturer. One-sided mounting angles are attached to a wall/ fl oor as well as to a damper, while two-sided mounting angles are attached to only a damper. FIGURE 3. Test panel with combination fi re/smoke damper. Smoke detector or relay Hot Com Switches BACnet FIGURE 4. Remote testing of a damper via BACnet. 18 2022 AMCA inmot ion Do I have to seal/caulk mounting angles? The sealing/caulking of mounting angles to a wall or fl oor is required neither by national codes nor for fi re-damper www.amca.org Interface module 165ºF Com Fire/smoke damper How fl ush against a wall or fl oor should mounting angles be? Mounting angles should be fl ush against a wall or fl oor. If an opening does not allow for fl ush mounting, consult the AHJ. Gaps of up to 1/8 in. (3.2 mm) generally are acceptable. What do I do if I have an old brick wall and mounting angles do not fi t fl ush? Sealants or fi restop material may be used to seal the top of a mounting angle to a wall. See the manufacturer's installation instructions for approved sealants or fi restop material. Can mounting angles be fi eld-supplied? Mounting angles (Photo E) can be fi eld- or factory-supplied. Consult the damper manufacturer's installation instructions for details.http://www.amca.org