The air coming out from branch of duct or collar needs to be controlled for proper air distribution.
It is used to control or regulate the air flow in ducted system.
It is used for controlling the air flow because of low cost and low maintenance.
These are installed in between the duct or at the inlet/outlet of the collar.
Types of Damper based on type of operation:
Parallel blade damper
Opposed blade damper
Parallel blade damper:
Parallel blade dampers are best suited for full open or closed requirements.
Opposed Blade damper:
Opposed blade dampers are best for systems where air volume is changed over a wide range.
It is used when modulate flow is required.
Types of Damper based on function:
Automatic Damper
Motorized Damper
Volume control Damper
Fire damper
Collar Damper
Automatic Damper:
These dampers open automatically when fan turns on and closed by gravity when fan closes .
These are commonly installed with wall exhaust or roof ventilator application.
Motorized Damper:
Its function is similar to the automatic damper but it is totally controlled by electric motor.
It can be operated by electric switch.
Volume Control Damper:
Square, rectangular, and round volume control dampers are specific types of dampers designed for purpose of controlling the air flow and pressure in HVAC system.
For square and rectangular dampers constructions comes with opposite blade arrangement with external links.
Fire Damper:
It is used to prevent the spread of fire inside the duct work.
It works when the surrounding temperature rises to about 165 degree Fahrenheit.
When temperature rises continuously, the fusible link which is attached to the damper melts. It causes dampers door to close.
Collar Damper:
It is used in collar of the duct to control the air which is coming out from the collar.
It is installed behind the grills, hence we can control the air flow manually.
0 Comments