Louvers and Dampers
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 6
to Rev 7
in Louvers and Dampers.
---
title: Louvers and Dampers
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### Louver selection depends first on the exposure and on the air velocity through the louver free area at the design airflow. {note}
+### The service exposure for each louver shall be specified so its rated water-penetration velocity can be selected to exceed the design intake velocity for that exposure.
+
```datasheet
label: Service Exposure
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```
+### The maximum operating differential pressure for each damper shall be specified so its actuator and blades are selected to close reliably against that pressure.
+
```datasheet
label: Damper Maximum Operating Differential Pressure
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```
−### Drainable-blade louvers shall be the default for exterior intake and exhaust openings, each blade having a downward-sloped front lip and a gutter that catches intercepted water and carries it to channels in the jambs that drain it down and out at the sill. {note}
+### Drainable-blade louvers shall be the default for exterior intake and exhaust openings, each blade having a downward-sloped front lip and a gutter that catches intercepted water and carries it to channels in the jambs that drain it down and out at the sill.
### Storm-resistant (wind-driven-rain) louvers use a deeper section, often with a hooked blade or a dual bank of blades, are AMCA-rated for performance in driven rain at high face velocities, and protect mission-critical intakes (data centers, hospitals, emergency power rooms) where any water carryover is unacceptable. {note}
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### Any life-safety damper that fails to operate as listed, and any control damper that fails to achieve its specified leakage class at full closure, shall be corrected at the Contractor's expense.