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Air Control Products 
Control Dampers
Nailor manufactures a comprehensive range of control dampers suitable for all commercial HVAC applications, from the cost effective single blade 1870 manual balancing damper to the industry leading ultra-low leakage, premium quality, AMCA Certified 2000 Series airfoil control damper. 

Whether the requirement is for a large multiple-section tight shut off outside air intake damper or a small branch duct round balancing damper, we have the model to fit your needs. 

All Nailor multi-blade volume control dampers incorporate the following standard design features: 

  • Double-bolted blade to axle attachment ensures blades do not slip or bow under pressure 
  • 16 gauge hat channel frame design with mitered corners and die-formed corner gursets provide strength equivalent to 13 gauge channel type frames and help eliminate racking 
  • 1" dia.  heavy duty full width jack shafting on larger multiple-section assemblies.  Eliminate torque twist and ensures even closure across the damper sections. 
Model Series Offerings:
1000 Series
1800 Series
2000 Series
 
 
 
 
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Air Control Products 

Smoke Dampers
For applications where building codes require a leakage rated (smoke) damper as part of a static smoke control or dynamic smoke management system.  Smoke dampers are intended: (1) to restrict the spread of smoke in HVAC systems that are designed to be automatically closed down in the event of a fire or (2) to control the movement of smoke within a building when the HVAC system is operational in engineered smoke control systems. 

In September 1983, Underwriters Laboratories issued the first edition of Standard UL555S to evaluate the leakage characteristics and operational reliability of smoke dampers together with a qualified actuator for use in engineered smoke control systems.  The current fourth edition was issued June 1999. 

UL qualification and leakage classification of a damper design require the testing of a minimum of three sizes of each design, representative of the range of sizes available.  The configurations must be a minimum width x maximum height, maximum width x minimum height and maximum width x maximum height.  The performance of the worst damper determines the damper/design class. 

In addition to leakage testing, each damper must pass the following for operational reliability: 

1. 5000 cycle operational test
2. Opening and closing against system pressures (up to 4" w.g.)
3. Salt spray and dust loading tests
4. Optional elevated temperature tests (250°F minimum or higher in increments of 100°F). 

The damper design must maintain its leakage classification after 1 and 4.  Leakage and temperature classifications are detailed as follows: 
 
  LEAKAGE 
CLASS
MAXIMUM LEAKAGE 
CFM/ft2
TEMPERATURE 
CATEGORIES
@1" W.G.
@ 4" W.G.
 
l
 
 
4
 
 
8
 
 
ambient (60 - 100°F)
250°F
350°F +
 
 
ll
 
 
10
 
 
20
 
 
ambient (60 - 100°F)
250°F
350°F +
 
 
lll
 
 
40
 
 
80
 
 
ambient (60 - 100°F)
250°F
350°F +
 
Dampers and their actuators may be required to operate under elevated temperatures during a fire condition in a dynamic smoke control system.  UL classifies the actuators for use with smoke dampers and their performance either at ambient or an elevated temperature.  The performance of a damper/actuator at an elevated temperature is usually limited by the actuator's capability. 

Model Series Offerings:
 
 
 
 
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Air Control Products 

Combination Fire/Smoke Dampers
These dampers are designed for applications where building codes require both a fire damper (for the protection of ductwork penetrations in walls or floors that have a fire resistance rating) and a smoke damper (for operational smoke control in static or dynamic smoke management systems).
Model Series Offerings: